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  • 1. Bai, Q.
    et al.
    Guo, Z.
    Li, H.
    Yang, Xiaohu
    KTH, School of Chemical Science and Engineering (CHE).
    Jin, L.
    Yan, Jerry
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Experimental investigation on the solidification behavior of phase change materials in open-cell metal foams2017In: Energy Procedia, Elsevier Ltd , 2017, Vol. 142, p. 3703-3708Conference paper (Refereed)
    Abstract [en]

    This study presented an experimental investigation on solidification behavior of fluid saturated in highly porous open-cell copper foams. Particular attention has been made on the effect of pore parameters (pore density and porosity) on the solidification behavior. A purposely-designed apparatus was built for experimental observations. Results showed that the copper foam had a great effect on solidification and the full solidification time can be saved up to 50%, especially preventing the decrease in solidification rate during the later stage of phase change. The smaller the porosity is, the faster the solidification rate will be. Pore density was found to have little influence upon the solidification rate. In addition, the local natural convection does exist but it has a slight effect on solidification, leading to the slant of the solid-liquid interface.

  • 2. Barbarelli, S.
    et al.
    Castiglione, T.
    Zupone, G. L.
    Bova, S.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    CFD Investigation of the Open Center on the Performance of a Tidal Current Turbine2019In: Renewable Energy Integration with Mini/Microgrid, Elsevier, 2019, Vol. 159, p. 28-33Conference paper (Refereed)
    Abstract [en]

    In the present paper, a revision of the layout of an innovative open center self-balancing tidal turbine is presented. Initially, the design was characterized by a central deflector, responsible for the machine equilibrium, hosted in the central part of the machine; the presence of this device, however, affected the size of the opening. Moreover, the turbine was conceived as connected to a steel rope subject to tensile stress. These peculiarities brought some critical issues due to the excessive length of the rope and to the size of the deflector, which constrained the diameters ratio. The new design involves the possibility of reducing the anchoring line length by substituting the rope with a series of tubular elements connected by alternate heavy and light nodes. The heavy nodes can gather the anchoring line when the tides stops acting. Moreover, the light nodes are floating deflectors, which develop the same action of the central deflector, whose size, in this configuration, does not affect the equilibrium. In the new machine configuration, the main deflector is located out of the center so that it can counterbalance the torque exerted by the rotor during its rotation. Finally, by means of CFD simulations, some criteria for assessing the best diameter ratio are defined.

  • 3. Budt, Marcus
    et al.
    Wolf, Daniel
    Span, Roland
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    COMPRESSED AIR ENERGY STORAGE - AN OPTION FOR MEDIUM TO LARGE SCALE ELECTRICAL-ENERGY STORAGE2016In: CUE 2015 - APPLIED ENERGY SYMPOSIUM AND SUMMIT 2015: LOW CARBON CITIES AND URBAN ENERGY SYSTEMS, Elsevier, 2016, p. 698-702Conference paper (Refereed)
    Abstract [en]

    This contribution presents the theoretical background of compressed air energy storage, examples for large scale application of this technology, chances and obstacles for its future development, and areas of research aiming at the development of commercially viable plants in the medium to large scale range.

  • 4. Campana, Pietro Elia
    et al.
    Holmberg, Aksel
    Pettersson, Oscar
    Klintenberg, Patrik
    Hangula, Abraham
    Araoz, Fabian Benavente
    KTH, School of Chemical Science and Engineering (CHE).
    Zhang, Yang
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
    Stridh, Bengt
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    An open-source optimization tool for solar home systems: A case study in Namibia2016In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 130, p. 106-118Article in journal (Refereed)
    Abstract [en]

    Solar home systems (SHSs) represent a viable technical solution for providing electricity to households and improving standard of living conditions in areas not reached by the national grid or local grids. For this reason, several rural electrification programmes in developing countries, including Namibia, have been relying on SHSs to electrify rural off-grid communities. However, the limited technical know-how of service providers, often resulting in over-or under-sized SHSs, is an issue that has to be solved to avoid dissatisfaction of SHSs' users. The solution presented here is to develop an open-source software that service providers can use to optimally design SHSs components based on the specific electricity requirements of the end-user, The aim of this study is to develop and validate an optimization model written in MS Excel-VBA which calculates the optimal SHSs components capacities guaranteeing the minimum costs and the maximum system reliability. The results obtained with the developed tool showed good agreement with a commercial software and a computational code used in research activities. When applying the developed optimization tool to existing systems, the results identified that several components were incorrectly sized. The tool has thus the potentials of improving future SHSs installations, contributing to increasing satisfaction of end-users.

  • 5. Campana, Pietro Elia
    et al.
    Quan, Steven Jige
    Robbio, Federico Ignacio
    Lundblad, Anders
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Zhang, Yang
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Ma, Tao
    Karlssona, Bjorn
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
    Optimization of a residential district with special consideration on energy and water reliability2017In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 194, p. 751-764Article in journal (Refereed)
    Abstract [en]

    Many cities around the world have reached a critical situation when it comes to energy and water supply, threatening the urban sustainable development. From an engineering and architecture perspective it is mandatory to design cities taking into account energy and water issues to achieve high living and sustainability standards. The aim of this paper is to develop an optimization model for the planning of residential urban districts with special consideration of renewables and water harvesting integration. The optimization model is multi-objective which uses a genetic algorithm to minimize the system life cycle costs, and maximize renewables and water harvesting reliability through dynamic simulations. The developed model can be used for spatial optimization design of new urban districts. It can also be employed for analyzing the performances of existing urban districts under an energy-water-economic viewpoint. The optimization results show that the reliability of the hybrid renewables based power system can vary between 40 and 95% depending on the scenarios considered regarding the built environment area and on the cases concerning the overall electric load. The levelized cost of electricity vary between 0.096 and 0.212 $/kW h. The maximum water harvesting system reliability vary between 30% and 100% depending on the built environment area distribution. For reliabilities below 20% the levelized cost of water is kept below 1 $/m(3) making competitive with the network water tariff.

  • 6. Campana, Pietro Elia
    et al.
    Quan, Steven Jige
    Robbio, Federico Ignacio
    Lundblad, Anders
    Zhang, Yang
    Ma, Tao
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Spatial optimization of residential urban district - Energy and water perspectives2016In: CUE 2015 - APPLIED ENERGY SYMPOSIUM AND SUMMIT 2015: LOW CARBON CITIES AND URBAN ENERGY SYSTEMS, Elsevier, 2016, p. 38-43Conference paper (Refereed)
    Abstract [en]

    Many cities around the world have reached a critical situation when it comes to energy and water supply, threatening the urban sustainable development. The aim of this paper is to develop a spatial optimization model for the planning of residential urban districts with special consideration of renewables and water harvesting integration. In particular, the paper analyses the optimal configuration of built environment area, PV area, wind turbines number and relative occupation area, battery and water harvester storage capacities, as a function of electricity and water prices. The optimization model is multi-objective which uses a genetic algorithm to minimize the system life cycle costs, and maximize renewables and water harvesting reliability. The developed model can be used for spatial optimization design of new urban districts. It can also be employed for analyzing the performances of existing urban districts under an energy-water-economic viewpoint. Assuming a built environment area equal to 75% of the total available area, the results show that the reliability of the renewables and water harvesting system cannot exceed the 6475 and 2500 hours/year, respectively. The life cycle costs of integrating renewables and water harvesting into residential districts are mainly sensitive to the battery system specific costs since most of the highest renewables reliabilities are guaranteed through the energy storage system.

  • 7.
    Campana, Pietro Elia
    et al.
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Wästhage, Louise
    Mälardalen Univ, Sch Business Soc & Engn, Future Energy Ctr, S-72123 Vasteras, Sweden..
    Nookuea, Worrada
    Mälardalen Univ, Sch Business Soc & Engn, Future Energy Ctr, S-72123 Vasteras, Sweden..
    Tan, Yuting
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Optimization and assessment of floating and floating-tracking PV systems integrated in on- and off-grid hybrid energy systems2019In: Solar Energy, ISSN 0038-092X, E-ISSN 1471-1257, Vol. 177, p. 782-795Article in journal (Refereed)
    Abstract [en]

    Considering the targets of Thailand in terms of renewable energy exploitation and decarbonization of the shrimp farming sector, this work evaluates several scenarios for optimal integration of hybrid renewable energy systems into a representative shrimp farm. In particular, floating and floating-tracking PV systems are considered as alternatives for the exploitation of solar energy to meet the shrimp farm electricity demand. By developing a dynamic techno-economic simulation and optimization model, the following renewable energy systems have been evaluated: PV and wind based hybrid energy systems, off-grid and on-grid PV based hybrid energy systems, ground mounted and floating PV based hybrid energy systems, and floating and floating-tracking PV based hybrid energy systems. From a water-energy nexus viewpoint, floating PV systems have shown significant impacts on the reduction of evaporation losses, even if the energy savings for water pumping are moderate due to the low hydraulic head. Nevertheless, the study on the synergies between water for food and power production has highlighted that the integration of floating PV represents a key solution for reducing the environmental impacts of shrimp farming. For the selected location, the results have shown that PV systems represent the best renewable solution to be integrated into a hybrid energy system due to the abundance of solar energy resources as compared to the moderate wind resources. The integration of PV systems in off-grid configurations allows to reach high renewable reliabilities up to 40% by reducing the levelized cost of electricity. Higher renewable reliabilities can only be achieved by integrating energy storage solutions but leading to higher levelized cost of electricity. Although the floating-tracking PV systems show higher investment costs as compared to the reference floating PV systems, both solutions show similar competiveness for reliabilities up to 45% due to the higher electricity production of the floating-tracking PV systems. The higher electricity production from the floating-tracking PV systems leads to a better competitiveness for reliabilities higher than 90% due to lower capacity requirements for the storage systems.

  • 8. Chen, Yushun
    et al.
    Zhang, Shuanghu
    Huang, Desheng
    Li, Bai-Lian
    Liu, Junguo
    Liu, Wenjin
    Ma, Jing
    Wang, Fang
    Wang, Yong
    Wu, Shengjun
    Wu, Yegang
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. Malardalen University, Sweden.
    Guo, Chuanbo
    Xin, Wei
    Wang, Hao
    The development of China's Yangtze River Economic Belt: how to make it in a green way?2017In: SCIENCE BULLETIN, ISSN 2095-9273, Vol. 62, no 9, p. 648-651Article in journal (Refereed)
  • 9.
    Chou, S. K.
    et al.
    Natl Univ Singapore, Dept Mech Engn, Singapore, Singapore..
    Costanza, Robert
    Australian Natl Univ, Crawford Sch Publ Policy, Canberra, ACT, Australia..
    Earis, Philip
    Joule Publicat Dept, Cambridge, MA USA..
    Hubacek, Klaus
    Univ Maryland, Dept Geog, College Pk, MD 20742 USA..
    Li, B. Larry
    Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA..
    Lu, Yonglong
    Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing, Peoples R China..
    Span, Roland
    Ruhr Univ Bochum, Fac Mech Engn, Thermodynam, Bochum, Germany..
    Wang, Hao
    China Inst Hydraul & Hydropower Res, Joule Publicat Dept, Beijing, Peoples R China..
    Wu, Jianping
    Tsinghua Univ, Sch Civil Engn, Beijing, Peoples R China..
    Wu, Yegang
    Beijing Bold Inst Ecocity Planning & Design, Joule Publicat Dept, Beijing, Peoples R China..
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Priority areas at the frontiers of ecology and energy2018In: ECOSYSTEM HEALTH AND SUSTAINABILITY, ISSN 2096-4129, Vol. 4, no 10, p. 243-246Article in journal (Refereed)
    Abstract [en]

    The complexity of economic development and humanitarian crises means that energy science and technology should be involved in actions that address almost every major challenges of ecosystem health and sustainability. Energy is the engine of the world economy and the key to ecosystems' functioning, which also has a great impact on global warming. The energy crisis, environmental pollution, overuse of natural resources, water supply shortages, global climate disruption, and deteriorating ecosystems are major challenges to address in order to achieve the United Nations Sustainable Development Goals (SDGs). In light of the frontiers in energy sciences and disruptive innovation in eco-tech, we recognize the need to review and establish working mechanisms that identify and examine issues that are critical to future sustainable development, to offer advice to decision-makers in different social sectors (public and private), to secure a shared future for mankind, and to achieve shared prosperity and common interests through international communications and collaborations.

  • 10. Dahlquist, E.
    et al.
    Naqvi, M.
    Thorin, E.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    Kyprianidis, K.
    Comparison of Gas Quality from Black Liquor and Wood Pellet Gasification Using Modelica Simulation and Pilot Plant Results2017In: 8th International Conference on Applied Energy, ICAE 2016; Beijing; China; 8 October 2016 through 11 October 2016, Elsevier, 2017, Vol. 105, p. 992-998Conference paper (Refereed)
    Abstract [en]

    There is a potential to integrate biomass gasification with pulp & paper and CHP plants in order to complement the existing systems with production of chemicals, such as methane, hydrogen, and methanol etc. To perform system analysis of such integration, it is important to gain knowledge of relevant input data on expected synthesis gas composition by gasifying different types of feed stock. In this paper, the synthesis gas quality from wood pellets gasification (WPG) has been compared with black liquor gasification (BLG) through modeling and experimental results at pilot scale. In addition, the study develops regression models like Partial Least Squares (PLS) made from the experimental data. The regression models are then combined with dynamic models developed in Modelica for the investigation of dynamic energy and material balances for integrated plants. The data presented in this study could be used as input to relevant analysis using e.g. ASPEN plus and similar system analysis tools.

  • 11. Dahlquist, E.
    et al.
    Naqvi, M.
    Thorin, E.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    Kyprianidis, K.
    Hartwell, P.
    Experimental and numerical investigation of pellet and black liquor gasification for polygeneration plant2017In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 204, p. 1055-1064Article in journal (Refereed)
    Abstract [en]

    It is vital to perform system analysis on integrated biomass gasification in chemical recovery systems in pulp and paper and heat and power plants for polygeneration applications. The proposed integration complements existing pulp and paper and heat and power production systems with production of chemicals such as methane and hydrogen. The potential to introduce gasification-based combined cycles comprising gas turbines and steam turbines to utilize black liquors and wood pellets also merits investigation. To perform such analysis, it is important to first build knowledge on expected synthesis gas composition by gasifying at smaller scale different types of feed stock. In the present paper, the synthesis gas quality from wood pellets gasification has been compared with black liquor gasification by means of numerical simulation as well as through pilot-scale experimental investigations. The experimental results have been correlated into partial least squares models to predict the composition of the synthesis gas produced under different operating conditions. The gas quality prediction models are combined with physical models using a generic open-source modelling language for investigating the dynamic performance of large-scale integrated polygeneration plants. The analysis is further complemented by considering potential gas separation using modern membrane technology for upgrading the synthesis gas with respect to hydrogen content. The experimental data and statistical models presented in this study form an important literature source for future use by the gasification and polygeneration research community on further integrated system analysis.

  • 12. Ding, J.
    et al.
    Pan, G.
    Du, L.
    Lu, J.
    Wei, X.
    Li, J.
    Wang, W.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    Theoretical prediction of the local structures and transport properties of binary alkali chloride salts for concentrating solar power2017In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 39, p. 380-389Article in journal (Refereed)
    Abstract [en]

    Comprehensive molecular simulations have been carried out to compute local structures and transport properties of different components of binary NaCl-KCl over a wide operating temperature range. The partial radial distribution functions, coordination number curves and angular distribution functions were calculated to analyze the influence of temperature and component on local structures of molten Alkali Chlorides. Transport properties were calculated by using reverse non-equilibrium molecular dynamics (RNEMD) simulations including densities, shear viscosity and thermal conductivity. The results show that ion clusters are considered to be formed and the distance of ion clusters become larger with increasing temperature which has great influence on macro-properties. The calculated properties have a good agreement with the experimental data, and similar method could be used to computationally calculate the properties of various molten salts and their mixtures.

  • 13.
    Ding, Jing
    et al.
    Sun Yat Sen Univ, Sch Engn, Guangzhou 510006, Guangdong, Peoples R China..
    Du, Lichan
    Sun Yat Sen Univ, Sch Engn, Guangzhou 510006, Guangdong, Peoples R China..
    Pan, Gechuanqi
    Sun Yat Sen Univ, Sch Engn, Guangzhou 510006, Guangdong, Peoples R China..
    Lu, Jianfeng
    Sun Yat Sen Univ, Sch Engn, Guangzhou 510006, Guangdong, Peoples R China..
    Wei, Xiaolan
    South China Univ Technol, Sch Chem & Chem Engn, Guangzhou 510640, Guangdong, Peoples R China..
    Li, Jiang
    Natl Supercomp Ctr Guangzhou, Guangzhou 510006, Guangdong, Peoples R China..
    Wang, Weilong
    Sun Yat Sen Univ, Sch Engn, Guangzhou 510006, Guangdong, Peoples R China..
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. Malardalen Univ, Sch Business Soc & Energy, Vasteras, Sweden.
    Molecular dynamics simulations of the local structures and thermodynamic properties on molten alkali carbonate K2CO32018In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 220, p. 536-544Article in journal (Refereed)
    Abstract [en]

    Molten carbonate salts have received particular attention for high-temperature thermal energy storage and heat Molecular dynamics simulation transfer applications due to desirable thermal characteristics, such as wide operating temperature range, low Molten alkali carbonates causticity and excellent thermal stability. In this study, molecular dynamics (MD) simulations were performed Local structures on molten alkali carbonate K2CO3 based on an effective pair potential model, a Born-Mayer type combined with Thermodynamic properties a Coulomb term. The radial distribution functions (RDF) and coordination number curves of the molten salt were characterized to explore the temperature dependences of macroscopic properties from microscopic view. The results suggest that the distance between K2CO3 particles is getting larger with temperature increasing, resulting in the increase of molar volume and the diminished ability of resistance to shear deformation and heat transfer by vibration between ions. Besides, it can be concluded that the structure of CO32- is inferred reasonably to be ortho-triangular pyramid from the comprehensive analysis of local structures including the angular distribution functions (ADF). Moreover, the thermodynamic properties were simulated in detail from 1200 to 1600 K including the density, thermal expansion coefficient, specific heat capacity, sheer viscosity, thermal conductivity and ion self-diffusion coefficient, which was hard to be measured from experiments under high-temperature extreme conditions, All the simulation results are in satisfactory agreement with available experimental data with high accuracy, and the minimum simulation error is as low as 1.42%.

  • 14. Ding, Y.
    et al.
    Shao, C.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. School of Business, Society and Engineering, Mälardalen University, SE-72123 Västerås, Sweden.
    Song, Y.
    Zhang, C.
    Guo, C.
    Economical flexibility options for integrating fluctuating wind energy in power systems: The case of China2018In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 228, p. 426-436Article in journal (Refereed)
    Abstract [en]

    The inherent stochastic nature of wind power requires additional flexibility during power system operation. Traditionally, conventional generation is the only option to provide the required flexibility. However, the provision of the flexibility from the conventional generation such as coal-fired generating units comes at the cost of significantly additional fuel consumption and carbon emissions. Fortunately, with the development of the technologies, energy storage and customer demand response would be able to compete with the conventional generation in providing the flexibility. Give that power systems should deploy the most economic resources for provision of the required operational flexibility, this paper presents a detailed analysis of the economic characteristics of these key flexibility options. The concept of “balancing cost” is proposed to represent the cost of utilizing the flexible resources to integrate the variable wind power. The key indicators are proposed respectively for the different flexible resources to measure the balancing cost. Moreover, the optimization models are developed to evaluate the indicators to find out the balancing costs when utilizing different flexible resources. The results illustrate that exploiting the potential of flexibility from demand side management is the preferred option for integrating variable wind power when the penetration level is below 10%, preventing additional fuel consumption and carbon emissions. However, it may require 8% of the customer demand to be flexible and available. Moreover, although energy storage is currently relatively expensive, it is likely to prevail over conventional generation by 2025 to 2030, when the capital cost of energy storage is projected to drop to approximately $ 400/kWh or lower. 

  • 15. Feng, J. -C
    et al.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    Yu, Z.
    Zeng, X.
    Xu, W.
    Case study of an industrial park toward zero carbon emission2018In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 209, p. 65-78Article in journal (Refereed)
    Abstract [en]

    Industrial park shoulders heavy responsibilities for economic development, and in the meantime, acts the role as energy consumer and carbon emitter. Under the background of holding the average global temperature increase limited in 2 °C compared to the pre-industrial level, which was proposed in the Paris Agreement, the development of zero carbon emission at the industrial park level is of great importance. This study investigated how to realize zero carbon emission at an industrial park level. In addition, a practical case study of the Southern China Traditional Chinese Medicine Industrial Park located in the Zhongshan City, Guangdong Province of China was conducted. Scenario analyses were projected to realize zero carbon emission in this industrial park and the results show that zero carbon emission can be realized under all the three scenarios. Economic assessments found that purchasing carbon offsets get the minimum cost effectiveness under current market situation. However, purchasing carbon offset may not be the best choice from the aspect of absolute reduction. Sensitivity analyses illustrate that the cost effectiveness of carbon reduction is remarkably influenced by the carbon price and solar energy cost reduction ratio. Meanwhile, applying large-scale renewable energy and producing more carbon offset can harvest more economic and carbon reduction benefits when the current solar energy cost has been reduced by 90%. Moreover, challenges of building zero-carbon industrial park as well as the corresponding solution schemes were discussed.

  • 16.
    Firmansyah, Husni
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Tan, Yuting
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Power and methanol production from biomass combined with solar and wind energy: analysis and comparison2018In: RENEWABLE ENERGY INTEGRATION WITH MINI/MICROGRID / [ed] Yan, J Wang, C Yu, J Jia, H Wu, J Xu, T Zhang, Y, ELSEVIER SCIENCE BV , 2018, p. 576-581Conference paper (Refereed)
    Abstract [en]

    This study addresses the techno-economic analysis and comparison of systems for power and methanol production from biomass combined with solar and wind energy, from both technical and economic perspectives. Three different systems, based on Integrated Gasification Combined-Cycle (IGCC), Oxy-fuel combustion, and syngas gasification, were evaluated. The hydrogen required for methanol production comes from water electrolysis driven by solar and wind energy. In addition, the effect of location was discussed.

  • 17. Gao, X.
    et al.
    Wei, P.
    Xie, Y.
    Zhang, S.
    Niu, Z.
    Lou, Y.
    Yang, Xiaohu
    KTH.
    Jin, L.
    Yan, Jerry
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Experimental investigation of the cubic thermal energy storage unit with coil tubes2017In: Energy Procedia, Elsevier Ltd , 2017, p. 3709-3714Conference paper (Refereed)
    Abstract [en]

    This study presented experimental investigations on the thermal performance of a thermal energy storage (TES) unit with coil tubes. A designed test rig was built and the melting heat transfer characteristics (melting front and temperature distribution) inside the TES unit were examined. The effects of charging flow rate on the overall phase change process were examined. The results showed that natural convection accelerated the thermal energy transport in the melt phase in the top region, but weakened the heat transfer in the bottom region; this resulted in the unmelt PCM at the bottom. The melting heat transfer was overall enhanced by the increase in inlet flow rate, indicating that the full charging time can be shortened by a larger flow rate.

  • 18. Guo, Shaopeng
    et al.
    Zhao, Jun
    Wang, Weilong
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Jin, Guang
    Wang, Xiaotong
    Techno-economic assessment of mobilized thermal energy storage for distributed users: A case study in China2017In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 194, p. 481-486Article in journal (Refereed)
    Abstract [en]

    The mobilized thermal energy storage (M-TES) system is a promising alternative to conventional heating systems to meet the heat demand for distributed users. This paper provided a techno-economic assessment of the M-TES system based on a case study in China. According to the analysis of the design specifications of the heating system, the suitability of matching the M-TES with existing heating systems was analyzed. The results show that the M-TES is appropriate for use with heating systems with a fan-coil unit and under-floor pipe. Containers and operating strategies for the M-TES with different transportation schemes were also designed. The maximum allowed load of the M-TES container is 39 t according to the discussion of transportation regulations on the road. The cost and income of the M-TES in the study case were estimated, and the net present value (NPV) and payback period (PBP) were also calculated. The best operating strategy is the use of 2 containers and 4 cycles of container transportation per day, with a PBP of approximately 10 years. The M-TES is applicable for middle and small-scale heat users in China.

  • 19. Guo, Shaopeng
    et al.
    Zhao, Jun
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Jin, Guang
    Wang, Xiaotong
    Economic Assessment of Mobilized Thermal Energy Storage for Distributed Users: A Case Study in China2016In: CUE 2015 - APPLIED ENERGY SYMPOSIUM AND SUMMIT 2015: LOW CARBON CITIES AND URBAN ENERGY SYSTEMS, Elsevier, 2016, Vol. 88, p. 656-661Conference paper (Refereed)
    Abstract [en]

    Mobilized thermal energy storage (M-TES) system can be an alternative of the conventional heating system to meet the heat demand for distributed users. This paper conducted a case study of the M-TES system in China. The operating strategies (OS) of the M-TES with different transportation schemes were compared. Moreover, the economic assessment was performed based on the project's net present value (NPV) and payback period (PBP). The OS with 6 trips per day is the most profitable with pay-back time of about 2, 3 and 5 years if the waste heat costs at the level of 0 epsilon/MWh, 3300 epsilon/MWh, and 6600 epsilon/MWh, respectively.

  • 20. Hao, Y.
    et al.
    Li, W.
    Tian, Z.
    Campana, Pietro Elia
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. School of Business, Society and Engineering, Mälardalen University, SE 72123 Västerås, Sweden.
    Li, H.
    Jin, H.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering. School of Business, Society and Engineering, Mälardalen University, SE 72123 Västerås, Sweden.
    Integration of concentrating PVs in anaerobic digestion for biomethane production2018In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 231, p. 80-88Article in journal (Refereed)
    Abstract [en]

    Biogas produced from anaerobic digestion processes is considered as an important alternative to natural gas and plays a key role in the emerging market for renewable energy. Aiming at achieving a more sustainable and efficient biomethane production, this work proposed a novel energy system, which integrates concentrating photovoltaic/thermal (C-PV/T) hybrid modules into a biogas plant with chemical absorption for biogas upgrading. The investigated energy system was optimized based on the data from an existing biogas plant, and its techno-economic feasibility was evaluated. Results show that about 7% of the heat consumption and 12% of the electricity consumption of the biogas plant can be covered by solar energy, by using the produced heat in a cascade way according to the operating temperature of different processes. The production of biomethane can also be improved by 25,800 N m3/yr (or 1.7%). The net present value of the integrated system is about 2.78 MSEK and the payback period is around 10 years. In order to further improve the economic performance, it is of great importance to lower the capital cost of the C-PV/T module. 

  • 21. Hu, Y.
    et al.
    Tewari, A.
    Varga, L.
    Li, H.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    System dynamics of oxyfuel power plants with liquid oxygen energy storage2017In: Proceedings of the 9th International Conference on Applied Energy, Elsevier, 2017, Vol. 142, p. 3727-3733Conference paper (Refereed)
    Abstract [en]

    Traditional energy storage systems have a common feature: the generating of secondary energy (e.g. electricity) and regenerating of stored energy (e.g. gravitational potential, and mechanical energy) are separate rather than deeply integrated. Such systems have to tolerate the energy loss caused by the second conversion from primary energy to secondary energy. This paper is concerned with the system dynamics of oxyfuel power plants with liquid oxygen energy storage, which integrates the generation of secondary energy (electricity) and regeneration of stored energy into one process and therefore avoids the energy loss caused by the independent process of regeneration of stored energy. The liquid oxygen storage and the power load of the air separation unit are self-adaptively controlled based on current-day power demand, day-ahead electricity price and real-time oxygen storage information. Such an oxyfuel power plant cannot only bid in the day-ahead market with base load power but also has potential to provide peak load power through reducing the load of the air separation unit in peak time. By introducing reasoning rules with fuzzy control, the oxygen storage system has potential to be further extended by integrating renewable energy resources into the system to create a cryogenic energy storage hub.

  • 22. Huang, C.
    et al.
    Li, Y.
    Li, X.
    Wang, H.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Wang, X.
    Wu, J.
    Li, F.
    Understanding the water-energy nexus in urban water supply systems with city features2018In: CLEANER ENERGY FOR CLEANER CITIES, Elsevier, 2018, Vol. 152, p. 265-270Conference paper (Refereed)
    Abstract [en]

    The water-energy nexus has been introduced into urban water supply systems (WSSs) to improve the current plight of scarce resources and greenhouse effect in recent years. Urban water-energy integrated management is limited by the characteristics and reality of each city. In this paper, we characterize the comprehensive influence factors of energy use in China urban WSSs including geographic differences and city forms. The results indicate that the pressure of pipeline network and plain area ratio restricted by geomorphology would significantly impact the energy consumption during conveyance and distribution stage. For the city form aspect, the total volume of urban water supply and the leakage rate of pipeline networks play important roles in energy consumption of urban WSSs in China. In this study, the specific electricity consumption in WSSs was quantified, and several factors affected by city features which show strong correlation with energy use were determined. The results are of great significance to the energy saving in water supply systems in urban areas.

  • 23. Jiang, M.
    et al.
    Lv, Y.
    Wang, T.
    Sun, Z.
    Liu, J.
    Yu, X.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Performance analysis of a photovoltaics aided coal-fired power plant2019In: Energy Procedia, Elsevier Ltd , 2019, p. 1348-1353Conference paper (Refereed)
    Abstract [en]

    In this article, integration of photovoltaics (PV) into a coal-fired power plant was proposed. The performance including economic analysis and environmental impact was conducted by a case study in the northwest area of China. The results show that the PV system can replace part of auxiliary power consumption using renewable electricity to reduce internal power consumption and the emissions. Due to the feature of the integration into a power plant, the curtailment of solar PV electricity does not occur compared to stand-alone PV system. The investment cost, operation and maintenance (O&M) expenditure were feasible compared with other PV power generation plants. 

  • 24.
    Jin, Ming
    et al.
    Univ Calif Berkeley, Dept Ind Engn & Operat Res, Berkeley, CA 94720 USA..
    Jain, Rishee
    Stanford Univ, Dept Civil & Environm Engn, Stanford, CA 94305 USA..
    Spanos, Costas
    Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA..
    Jia, Qingshan
    Tsinghua Univ, Dept Automat, Beijing, Peoples R China..
    Norford, Leslie K.
    MIT, Dept Architecture, Cambridge, MA 02139 USA..
    Kjaergaard, Mikkel
    Univ Southern Denmark, Maersk McKinney Moller Inst, Odense, Denmark..
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. Malardalen Univ, Sch Sustainable Dev Soc & Technol, S-72123 Vasteras, Sweden.
    Energy-cyber-physical systems2019In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 256, article id 113939Article in journal (Refereed)
  • 25.
    Leung, Dennis Y. C.
    et al.
    Univ Hong Kong, Hong Kong, Hong Kong, Peoples R China..
    Yang, Hongxing
    Hong Kong Polytech Univ, Hong Kong, Hong Kong, Peoples R China..
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Editorial for Special Issue of the First International Conference on Applied Energy, ICAE'09, Hong Kong, January 5-7, 2009 at the journal, Applied Energy2010In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 87, no 9, p. 2861-2861Article in journal (Other academic)
  • 26. Li, H.
    et al.
    Campana, Pietro Elia
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Tan, Yuting
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.
    Yan, Jerry
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Feasibility study about using a stand-alone wind power driven heat pump for space heating2018In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 228, p. 1486-1498Article in journal (Refereed)
    Abstract [en]

    Reducing energy consumption and increasing the use of renewable energy in the building sector are crucial to the mitigation of climate change. Wind power driven heat pumps have been considered as a sustainable measure to supply heat to the detached houses, especially those that even do not have access to the electricity grid. This work is to investigate the dynamic performance of a heat pump system driven by wind turbine through dynamic simulations. In order to understand the influence on the thermal comfort, which is the primary purpose of space heating, the variation of indoor temperature has been simulated in details. Results show that the wind turbine is not able to provide the electricity required by the heat pump during the heating season due to the intermittent characteristic of wind power. To improve the system performance, the influences of the capacity of wind turbine, the size of battery and the setpoint of indoor temperature were assessed. It is found that increasing the capacity of wind turbines is not necessary to reduce the loss of load probability; while on the contrary, increasing the size of battery can always reduce the loss of load probability. The setpoint temperature clearly affects the loss of load probability. A higher setpoint temperature results in a higher loss of thermal comfort probability. In addition, it is also found that the time interval used in the dynamic simulation has significant influence on the result. In order to have more accurate results, it is of great importance to choose a high resolution time step to capture the dynamic behaviour of the heat supply and its effect on the indoor temperature. 

  • 27. Li, Hailong
    et al.
    Campana, Pietro Elia
    Berretta, Sara
    Tan, Yuting
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Ningbo RX New Materials Tch. Co. Ltd., China.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. Mälardalens University, Sweden.
    Dynamic performance of the standalone wind power driven heat pump2016In: PROCEEDINGS OF RENEWABLE ENERGY INTEGRATION WITH MINI/MICROGRID (REM2016) / [ed] Yan, J Zhai, Y Wijayatunga, P Mohamed, AM Campana, PE, ELSEVIER SCIENCE BV , 2016, p. 40-45Conference paper (Refereed)
    Abstract [en]

    Reducing energy consumption and increasing use of renewable energy in the building sector are crucial to the mitigation of climate change. Wind power driven heat pumps have been considered as a sustainable measure to supply heat for detached houses, especially those that even don't have access to the grid. This work is to investigate the dynamic performance of a heat pump system directly driven by a wind turbine. The heat demand of a detached single family house was simulated in details. According to the simulations, the wind turbine is not able to provide the electricity demanded by the heat pump all the time due to the intermittent characteristic of wind power. To solve it, an electric energy storage system was included. Obviously, increasing the size of battery can always reduce the probability of load loss. However, different from the energy storage system, increasing the capacity of wind turbines is not necessary to reduce the probability of load loss instead, due to the different start-up speeds for different capacities of wind turbines. In order to maximize the system benefit, it is of great importance to optimize the capacity of the wind turbine and the size of the energy storage system simultaneously based on dynamic simulations.

  • 28.
    Li, Hailong
    et al.
    Mälardalen University, School of Sustainable Development of Society and Technology, Västerås, Sweden.
    Hu, Yukun
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Ditaranto, Mario
    Willson, David
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Optimization of cryogenic CO2 purification for oxy-coal combustion2013In: Energy Procedia, Elsevier, 2013, p. 1341-1347Conference paper (Refereed)
    Abstract [en]

    Oxyfuel combustion is a leading potential CO2 capture technology for power plants. As the flue gas (FG) consists of mainly H2O and CO2, a simpler and more energy-efficient CO2 purification method can be used instead of the standard amine-based chemical absorption approach. For the system of oxyfuel combustion with cryogenic CO2 purification, decreasing the oxygen purity reduces the energy consumption of the Air Separation Unit (ASU) but increases the energy consumption for the downstream cryogenic purification. Thus there exists a trade-off between the energy consumption of the ASU and that for cryogenic purification. This paper investigates the potential efficiency improvement by optimizing this trade-off. The simulated results show that there exists an optimum flue gas condensing pressure for the cryogenic purification, which is affected by the flue gas composition. In addition, decreasing the oxygen purity reduces the combined energy consumption of the ASU and the cryogenic purification, and therefore can improve the electrical efficiency. In summary, prior oxyfuel combustion analyses have assumed a high oxygen purity level of 95 mol% or 99 mol% for the combustion air, which achieves a high CO2 concentration in the flue gases. In this Paper, we demonstrate that a lower level of oxygen purity, such as 80 mol%, in conjunction with a more extensive cryogenic purification of the flue gases can lower the total energy consumption, thereby yielding a significant benefit. However, for oxygen purity levels lower than 75 mol%, it may not be possible to still use the two-stage flash system shown here to achieve a CO2 purity of 95 mol% and a CO2 recovery rate of 90% simultaneously.

  • 29. Li, X.
    et al.
    Campana, P. E.
    Li, H.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Malardalen University, Sweden.
    Zhu, K.
    Energy storage systems for refrigerated warehouses2017In: Leveraging Energy Technologies and Policy Options for Low Carbon Cities, Elsevier, 2017, Vol. 143, p. 94-99Conference paper (Refereed)
    Abstract [en]

    To reduce the peak load, dynamic electricity price schemes have been widely used. Refrigerated warehouses consume a large amount of energy, most of which happens during the daytime due to the higher ambient temperature. This work evaluated the potential benefits of integrating energy storage in the refrigerated warehouses. Two types of energy storage systems have been considered, including a cold energy storage system and an electrical energy storage system. A dynamic model has been developed in TRNSYS to study the performance of those two energy storage systems and assess the benefits. Results show that using the cold energy storage to shift power consumption from daytime to nighttime can increase the energy efficiency of the refrigeration system. However, as the electrical energy storage system can shift more power consumption, it can achieve a large cost saving. Compared to the reference system without energy storage, the introductions of a cold energy storage system and an electrical energy storage system can reduce the operational cost by 10 and 53.7% respectively.

  • 30. Liang, X.
    et al.
    Tian, W.
    Li, R.
    Niu, Z.
    Yang, X.
    Meng, X.
    Jin, L.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. School of Sustainable Development of Society and Technology, Mälardalen University (MDH), Västerås, 721 23, Sweden.
    Numerical investigations on outdoor thermal comfort for built environment: Case study of a Northwest campus in China2019In: Innovative Solutions for Energy Transitions, Elsevier, 2019, Vol. 158, p. 6557-6563Conference paper (Refereed)
    Abstract [en]

    Outdoor thermal comfort has been receiving more and more attentions due to the increased demand of outdoor activities during last decades. People require good thermal comfort when they are exposed to the outdoor thermal environment. However, the natural environment is severely suffering from the pollution of air, water as well as the extremely hot weather. Therefore, construction of ecological living environment is of great importance. To evaluate and improve the built environment, a campus area located in Northwest China was selected. Numerical simulations based on the software ENVI-met V4.0 were conducted and the effect of growing plants upon the outdoor thermal comfort was analyzed. Numerical results were compared using different thermal Indexes: Physiological Equivalent Temperature (PET) and Universal Thermal Climate Index (UTCI). Results demonstrated that UTCI gave a lower prediction than that of PET and was more suitable for evaluating the outdoor thermal comfort. Growing trees can significantly reduce the uncomfortable hours during hot summer but the improvement will reach the limitation after growing amount of trees.

  • 31. Liu, Jiahong
    et al.
    Chen, Silan
    Wang, Hao
    Campana, Pietro Elia
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Evolution of China's urban energy consumption structure-a case study in Beijing2016In: CUE 2015 - APPLIED ENERGY SYMPOSIUM AND SUMMIT 2015: LOW CARBON CITIES AND URBAN ENERGY SYSTEMS, 2016, p. 88-93Conference paper (Refereed)
    Abstract [en]

    China is a coal-based energy consuming country. The proportion of coal is up to 70% in the energy consumption structure in 1990s. In the past 20 years, driven by energy saving policy, China's energy consumption structure has undergone great changes, especially in urban areas. This paper explores the evolution of energy-use structure at the national level and the level of Beijing City in China. Four major energy sources were considered, including coal, oil, natural gas and electricity. The dataset was collected from 1990 to 2012. The results show that the proportion of coal consumption decreased by approximately 20% from 1990 to 2012 at the national level in compare with nearly 50% at the level of Beijing City. Furthermore, the proportion of natural gas consumption and other clean energies rose. In Beijing the natural gas and other clean energies account for over 60% of the total energy in 2012, which played an important role in improving the local environment.

  • 32. Liu, Junguo
    et al.
    Mao, Ganquan
    Hoekstra, Arjen Y.
    Wang, Hao
    Wang, Jianhua
    Zheng, Chunmiao
    van Vliet, Michelle T. H.
    Wu, May
    Ruddell, Benjamin
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Managing the energy-water-food nexus for sustainable development2018In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 210, p. 377-381Article in journal (Other academic)
  • 33.
    Liu, Minzhang
    et al.
    Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China..
    Zhu, Chunguang
    Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China..
    Zhang, Huan
    Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China.;Tianjin Univ, Minist Educ China, Key Lab Efficient Utilizat Low & Medium Grade Ene, Tianjin 300350, Peoples R China..
    Zheng, Wandong
    Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China.;Tianjin Univ, Minist Educ China, Key Lab Efficient Utilizat Low & Medium Grade Ene, Tianjin 300350, Peoples R China..
    You, Shijun
    Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300072, Peoples R China.;Tianjin Univ, Minist Educ China, Key Lab Efficient Utilizat Low & Medium Grade Ene, Tianjin 300350, Peoples R China..
    Campana, Pietro Elia
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    The environment and energy consumption of a subway tunnel by the influence of piston wind2019In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 246, p. 11-23Article in journal (Refereed)
    Abstract [en]

    With the flourishing development of the subway construction, it becomes increasingly urgent to improve the subway tunnel environment and reduce the energy consumption of the tunnel ventilation system. The tunnel environment is significantly affected by the piston wind, which is influenced by the train speed. In this paper, a three-dimensional computational model of a subway tunnel is developed and validated through experiments. The model is used to study the carbon dioxide concentration and thermal environment of the subway tunnel. The optimal train speed is proposed with the aim to minimize the volume of mechanical supply air and to optimize the carbon dioxide concentration and thermal environment of the tunnel. In parallel with the considerations of tunnel environment, the subways in 25 cities of China are analyzed to study the energy conservation of the tunnel ventilation system by making full use of piston wind. The results indicate that the optimal train speed is 30 m/s based on the carbon dioxide concentration and thermal environment. The effective utilization of the piston wind can reduce 13% similar to 32% of the energy consumption for tunnel ventilation. The calculation method of the optimal train speed developed in this paper is also applicable to ordinary railway tunnels and high-speed railway tunnels.

  • 34. Liu, Zhu
    et al.
    Feng, Kuishuang
    Davis, Steven J.
    Guan, Dabo
    Chen, Bin
    Hubacek, Klaus
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. Malardalen University (MDU), Sweden.
    Understanding the energy consumption and greenhouse gas emissions and the implication for achieving climate change mitigation targets2016In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 184, p. 737-741Article in journal (Other academic)
  • 35. Lv, Y.
    et al.
    Bi, J.
    Yan, Jinyue
    KTH.
    State-of-the-art in low carbon community2018In: International Journal of Energy for a Clean Environment, ISSN 2150-3621, E-ISSN 2150-363X, Vol. 19, no 3-4, p. 175-200Article in journal (Refereed)
    Abstract [en]

    The global warming and energy crisis have att racted signifi cant att ention round the world in recent years. As a basic social unit involving building construction, inhabitant transportation, energy utilization, and individual behavior, the community may signifi cantly aff ect the carbon emissions generated by humans. The concept of low carbon community has been accordingly proposed to reduce global greenhouse gas emissions and accelerate a prosperous low carbon economy. In this paper, various low carbon technologies, strategies, and lifestyles, involving community planning, advanced green building technologies, renewable energy supply systems, sustainable transportation, water recycle and waste management systems, change of low carbon living mode and energy-related behavior were thoroughly discussed. The current status of low carbon community practices in both developed countries and China, together with their corresponding achievements, has been reviewed. Evaluation tools and indicators were analyzed to provide important references for policy makers in supporting sustainable community construction activities. Furthermore, recommendations were proposed to facilitate the development of low carbon communities in the future.

  • 36. Lv, Y.
    et al.
    Si, P.
    Liu, J.
    Ling, W.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes.
    Performance of a hybrid solar photovoltaic - Air source heat pump system with energy storage2019In: Energy Procedia, Elsevier Ltd , 2019, p. 1311-1316Conference paper (Refereed)
    Abstract [en]

    The paper introduced a smart renewable energy based microgrid system which is composed of three subsystems: solar photovoltaic subsystem, air source heat pump subsystem and energy storage subsystem. This microgrid system was applied to the demonstration project located in Xining City, Qinghai Province, China. The energy performance of the smart renewable energy based microgrid system was evaluated and compared with that of traditional energy supply system which totally depends on the electricity grid and natural gas. The comparison study demonstrates that the proposed hybrid energy supply system is superior to traditional system, significantly decreasing additional energy consumption for buildings and reducing pollutant emissions.

  • 37. Lv, Yuexia
    et al.
    Si, Pengfei
    Liu, Xichen
    Rong, Xiangyang
    Feng, Ya
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    An Optimized Model for Solar Thermal Collectors Based on Concept of Effective Heat Collection2016In: CUE 2015 - APPLIED ENERGY SYMPOSIUM AND SUMMIT 2015: LOW CARBON CITIES AND URBAN ENERGY SYSTEMS, Elsevier, 2016, p. 470-475Conference paper (Refereed)
    Abstract [en]

    The performance of solar collector highly relies on its tilt angle with respect to horizontal plane and orientation (surface azimuth angle) of the collector. The effective heat collection concept was proposed and an optimized mathematical model was further developed to determine the optimum tilt angle and orientation for the solar collector. The developed model was applied in a case study of the Lhasa district, in comparison with the results obtained in accordance with conventional optimization results. The research results showed that, there is about 5 degrees deviation between the optimum results obtained according to effective heat collecting capacity and the optimum results obtained according to maximum total solar radiation falling on the solar collector.

  • 38.
    Lv, Yuexia
    et al.
    Qilu Univ Technol, Shandong Acad Sci, Sch Mech & Automot Engn, Jinan 250353, Shandong, Peoples R China.;Ningbo RK Solar Tech Ltd, Ningbo 315201, Zhejiang, Peoples R China..
    Si, Pengfei
    Tsinghua Univ, Sch Architecture, Beijing 100084, Peoples R China.;China Southwest Architecture Design & Res Inst Co, Chengdu 610041, Sichuan, Peoples R China..
    Rong, Xiangyang
    China Southwest Architecture Design & Res Inst Co, Chengdu 610041, Sichuan, Peoples R China..
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. Mälardalen Univ, Sch Business Soc & Engn, S-72123 Västerås, Sweden..
    An Optimization Method for CCHP and River Water Source Heat Pump Combined System2018In: RENEWABLE ENERGY INTEGRATION WITH MINI/MICROGRID / [ed] Yan, J Wang, C Yu, J Jia, H Wu, J Xu, T Zhang, Y, ELSEVIER SCIENCE BV , 2018, p. 592-597Conference paper (Refereed)
    Abstract [en]

    Combined Cooling, Heating and Power (CCHP) systems have been widely utilized in the buildings to achieve high efficiency cascade utilization of energy. Heat pump is another widely utilized technology to improve the building energy efficiency. The paper presents a hybrid system which integrates the CCHP with river water source heat pump to combine the advantages of these two technologies. A physical model with energy storage module was firstly developed for the combined system. A case study was further carried out to investigate the optimized configuration and operation performance of the combined system. Copyright

  • 39.
    Lv, Yuexia
    et al.
    Qilu Univ Technol, Shandong Acad Sci, Sch Mech & Automot Engn, Jinan 250353, Shandong, Peoples R China.;Ningbo RK Solar Tech Ltd, Ningbo 315201, Zhejiang, Peoples R China..
    Xia, Longyu
    Qilu Univ Technol, Shandong Acad Sci, Sch Mech & Automot Engn, Jinan 250353, Shandong, Peoples R China..
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. Mälardalen Univ, Sch Business Soc & Engn, S-72123 Västerås, Sweden..
    Bi, Jinpeng
    Qilu Univ Technol, Shandong Acad Sci, Sch Mech & Automot Engn, Jinan 250353, Shandong, Peoples R China..
    Design of a Hybrid Fiber Optic Daylighting and PV Solar Lighting System2018In: RENEWABLE ENERGY INTEGRATION WITH MINI/MICROGRID / [ed] Yan, J Wang, C Yu, J Jia, H Wu, J Xu, T Zhang, Y, ELSEVIER SCIENCE BV , 2018, p. 586-591Conference paper (Refereed)
    Abstract [en]

    Residential buildings with limited natural lighting are generally lit by fuel-based electricity which contributes to increase of CO2 concentration in the atmosphere. This paper presents the design of a hybrid fiber-optic daylighting and PV solar lighting system for household applications. The system is composed of a light collecting subsystem, a light guiding subsystem, an optical fiber light diffuser subsystem and corresponding control system. Preliminary system performance shows that, the developed system could provide comfortable and natural indoor illumination. Meanwhile, the hybrid lighting system can provide an average of 9h of electric lighting under clear sky conditions, and reduce 158.2kg of carbon dioxide emission in a year within the tested dark room of 5m(2).

  • 40. Mancuso, M. V.
    et al.
    Campana, Pietro Elia
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. School of Sustainable Development of Society and Technology, Malardalen University, Västerås.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. School of Sustainable Development of Society and Technology, Malardalen University, Västerås.
    Evaluation of grid-connected micro-grid operational strategies2019In: Innovative Solutions for Energy Transitions, Elsevier, 2019, Vol. 158, p. 1273-1278Conference paper (Refereed)
    Abstract [en]

    This study investigates the operational performances of a grid-connected microgrid with integrated solar photovoltaic and battery energy storage. The study is based upon the techno-economic specifications and theoretical performance of the distributed energy resource and storage systems, as well as on measured consumer load data and electrical utility retail and distribution data for representative residential and commercial loads for the city of Västerås, Sweden. The open-source Matlab®-based simulation tool, OptiCE, is used for performing simulations and optimization. To support the attainment of one of the objectives, peak shaving of the consumer load, a battery operational strategy algorithm has been developed to balance peak shaving and PV self-consumption. Comparisons among three types of battery, lead-acid, lithium-ion and vanadium-redox flow, are also performed. A 117 kW p photovoltaic system paired with a lithium-ion battery of 41.1 kWh capacity is the optimal solution found for the considered commercial load. The calculated battery capacity represents the best trade-off for the set multi-objective optimization problem. The simulation of this system predicts the possibility to shave the customer load profile peaks up to 20% for the month of April. The corresponding self-consumption ratio is 88%. Differences in the relationship between the load profiles and the system performance have been qualitatively noted. Furthermore, the simulation results for lead-acid, lithium-ion and vanadium-redox flow battery systems reveal that lithium-ion batteries delivers the best trade-off between total annualized cost and peak shaving performance for both residential and commercial applications.

  • 41. Naqvi, M.
    et al.
    Dahlquist, E.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering. Mälardalen University, Sweden.
    Naqvi, S. R.
    Nizami, A. S.
    Salman, C. A.
    Danish, M.
    Farooq, U.
    Rehan, M.
    Khan, Z.
    Qureshi, A. S.
    Polygeneration system integrated with small non-wood pulp mills for substitute natural gas production2018In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 224, p. 636-646Article in journal (Refereed)
    Abstract [en]

    This study aims to examine the potential substitute natural gas (SNG) production by integrating black liquor gasification (BLG) island with a small wheat straw-based non-wood pulp mills (NPM), which do not employ the black liquor recovery cycle. For such integration, it is important to first build knowledge on expected improvements in an overall integrated non-wood pulp mill energy system using the key performance indicators. O2-blown circulating fluidized bed (CFB) gasification with direct causticization is integrated with a reference small NPM to evaluate the overall performance. A detailed economic analysis is performed together with a sensitivity analysis based on variations in the rate of return due to varying biomass price, total capital investment, and natural gas prices. The quantitive results showed considerable SNG production but significantly reduced electricity production. There is a substantial CO2 abatement potential combining CO2 capture and CO2 mitigation from SNG use replacing compressed natural gas (CNG) or gasoline. The economic performance through sensitivity analysis reflects significant dependency on both substitute natural gas production and natural gas market price. Furthermore, the solutions to address the challenges and barriers for the successful commercial implementation of BLG based polygeneration system at small NPMs are discussed. The system performance and discussion on the real application of integrated system presented in this article form a vital literature source for future use by large number of small non-wood pulp industries.

  • 42. Naqvi, Muhammad
    et al.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    Dahlquist, Erik
    Naqvi, Salman Raza
    Off-grid electricity generation using mixed biomass compost: A scenario-based study with sensitivity analysis2017In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 201, p. 363-370Article in journal (Refereed)
    Abstract [en]

    The aim of the study is to investigate the viability of waste gasification based off-grid electricity generation utilizing mixed biomass composts (mixture of rice hulls with cow/poultry manure compost). The economic viability is studied on the different scenarios with considerations of (1) levels of electricity demand and utilization, (2) costs of variable biomass mix, (3) combined domestic and cottage industry business model, and (4) influence of governmental investments. The levelized cost of electricity (LCOE) is used as an indicator to measure the competitiveness of gasification based off-grid electricity generation. The plant loading and the capacity factor have been used to assess the impacts of different scenarios. A sensitivity analysis of key parameters based on variations in annual operational hours, plant efficiency, plant cost and biomass supply cost is conducted. Based on levels of electricity demand and utilization, the LCOE ranged between 40 US cents/kW h and 29 US cents/kW h based on the plant loading and the capacity factor. The business revenue would not change considerably despite better plant utilization and reduced levelized cost of electricity if all the consumers, both basic or medium, are charged with the flat tariff. The part load operation will be costly despite considerably low capital investment per kW in comparison with PV or solar based plants. There is a large potential of off-grid electricity generation but the estimated off-grid electricity price is found to be higher in all scenarios than average grid-based electricity tariff. Moreover, the challenges for the implementation of the real off-grid electricity generation plant are discussed.

  • 43. Naqvi, Muhammad
    et al.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. Mälardalen University, Sweden.
    Dahlquist, Erik
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
    Naqvi, Salman Raza
    Waste biomass gasification based off-grid electricity generation: A case study in Pakistan2016In: PROCEEDINGS OF RENEWABLE ENERGY INTEGRATION WITH MINI/MICROGRID (REM2016) / [ed] Yan, J Zhai, Y Wijayatunga, P Mohamed, AM Campana, PE, Elsevier, 2016, p. 406-412Conference paper (Refereed)
    Abstract [en]

    The objective is to investigate the waste gasification based off-grid electricity generation in developing countries like Pakistan utilizing mixed biomass composts (mixture of agricultural wastes including rice hulls and wheat straw with cow/poultry manure compost). Different scenarios are compared; ( 1) levels of electricity demand and utilization, ( 2) costs for variable biomass mix, ( 3) combined domestic and cottage industry business model. The levelized cost of electricity (LCOE) is used as an indicator to measure the competitiveness of off-grid electricity generation. There is a large potential of off-grid electricity generation. However, the estimated off-grid electricity price is found to be higher in all scenarios than average governmental electricity tariff.

  • 44. Nemet, Andreja
    et al.
    Klemes, Jiri Jaromir
    Duic, Neven
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology. Malardalen University (MDU), Sweden.
    Improving sustainability development in energy planning and optimisation2016In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 184, p. 1241-1245Article in journal (Refereed)
    Abstract [en]

    This special issue of Applied Energy contains articles developed from initial ideas related to the 10th Conference on Sustainable Development of Energy, Water and Environment Systems (SDEWES) held in Dubrovnik, Croatia during September 27 - October 2, 2015. The main focus of the event is the sustainability development joining all required areas for achieving as improving the knowledge on method, policies and technologies as well as dissemination of the results. Overall, 64 extended manuscripts have been invited as candidate articles. After a thorough review procedure, 23 articles have been selected to be published. The topics attained in the focus of this Special Issue include Integration, Optimisation and Analysis of energy systems as well as dissemination of the developed methodology and results obtained.

  • 45. Niu, Z.
    et al.
    Yu, J.
    Cui, X.
    Yang, X.
    Sun, Y.
    Yan, Jinyue
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. School of Sustainable Development of Society and Technology, Mälardalen University (MDH), Västerås, 721 23, Sweden.
    Experimental investigations on the thermal energy storage performance of shell and tube unit with composite phase change materials2019In: Innovative Solutions for Energy Transitions, Elsevier, 2019, Vol. 158, p. 4889-4896Conference paper (Refereed)
    Abstract [en]

    This work presented experimental investigations on the thermal energy storage performance of the shell and tube unit with composite phase change materials (PCM). A cylindrical heat storage tank filled with open-cell copper foam was proposed and its melting process characteristics were studied. A designed test system was established to record the PCM real-time temperature data. The results showed that, compared with traditional smooth-tube phase-change heat exchangers, the composite PCM unit accelerated the bottom paraffin melting. The temperature disparity among different height reduced, which resulted in better internal temperature uniformity. Due to the expanded heat transfer area, improved heat transfer coefficient and weakened natural convection, the bottom phase-change materials in the composite-PCM heat-storage unit melt faster.

  • 46. Nookuea, W.
    et al.
    Zambrano, J.
    Tan, Yuting
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Li, H.
    Thorin, E.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    Comparison of Mass Transfer Models on Rate-Based Simulation of CO2 Absorption and Desorption Processes2017In: Proceedings of the 9th International Conference on Applied Energy, Elsevier, 2017, Vol. 142, p. 3747-3752Conference paper (Refereed)
    Abstract [en]

    The effective technology for capturing CO2 at the low concentration is chemical absorption, due to the high reactivity between CO2 and aqueous amine solutions. To capture CO2, the process involves complex reactive separations. The accurate calculation of hydrodynamic properties, and mass and energy transfer are of importance for the design of the absorber and desorber columns. This paper performs the rate-based simulations of CO2 absorption by Monoethanolamine in Aspen Plus. In the calculation of the mass transfer coefficients, different mass transfer models were implemented. In comparison with the desorber, the impacts of mass transfer models were more significant in the simulation of the absorber. For both columns, the impacts of the mass transfer models on the concentration profiles were more significant than those on the temperature profiles. For the absorber, the maximum deviations occur at the bottom of the column for both the concentration and the temperature profiles. Different from the absorber, for the desorber, the maximum deviations occur close to the top of the column.

  • 47. Nookuea, Worrada
    et al.
    Campana, Pietro Elia
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes.
    Evaluation of Solar PV and Wind Alternatives for Self Renewable Energy Supply: Case Study of Shrimp Cultivation2016In: CUE 2015 - APPLIED ENERGY SYMPOSIUM AND SUMMIT 2015: LOW CARBON CITIES AND URBAN ENERGY SYSTEMS, Elsevier, 2016, p. 462-469Conference paper (Refereed)
    Abstract [en]

    The challenges in shrimp cultivation are the intensive electricity consumptions with associated greenhouse gases emissions, security of power supply, and environmental impact from the discharged waste water. Following Thailand energy roadmap, the renewable energy share in power production sector is targeted to be increased, for energy security and climate change mitigation. This paper evaluates six different scenarios of renewable energy implementation for shrimp farm in Thailand. The results show that the system with solar PV has higher reliability compared to the one with wind turbine at equal life cycle cost. The reliability of the system with solar PV and solar PV with battery varies significantly with the life cycle cost at low cost range then becomes stable. On the other hand, it was found to be quite stable in the cases of wind turbine with and without battery. Adding battery to the system significantly increases the reliability of solar PV and slightly increases for wind turbine. At the life cycle cost lower than $1 million, maximum reliability of the system with solar PV is around 53%. By adding battery, the reliability of the system can be up to 90%. The different magnitudes of the reliability between these two scenarios are higher at higher life cycle cost. For this case study, to reach higher than 50% reliability, the recommended renewable alternative is solar PV with battery.

  • 48. Nookuea, Worrada
    et al.
    Tan, Yuting
    KTH, School of Chemical Science and Engineering (CHE).
    Li, Hailong
    Thorin, Eva
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen University, Sweden.
    Impacts of thermo-physical properties of gas and liquid phases on design of absorber for CO2 capture using monoethanolamine2016In: International Journal of Greenhouse Gas Control, ISSN 1750-5836, E-ISSN 1878-0148, Vol. 52, p. 190-200Article in journal (Refereed)
    Abstract [en]

    Absorption of CO2 with aqueous amines in post-combustion capture is characterized as a heat and mass transfer processes with chemical reaction, which is sensitively affected by the thermo-physical properties of fluids. In order to optimize the design of the absorber of CO2 capture process, in this paper, the impacts of thermo-physical properties on the column design were investigated. Furthermore, the property impacts on the capital cost of the absorber unit were also identified and analyzed. Results show that the gas phase density has the most significant effect on the column diameter. Underestimation of the gas phase density of 10% may result in an increase of about 6% of the column diameter. For the packing height, the liquid phase density has the most significant effect. 10% underestimation of the liquid phase density may result in an increase of 8% of the packing height. Moreover, the effect from the liquid phase viscosity is also significant. For the annual capital cost, the liquid phase density also shows the most significant effect. Underestimation of the liquid phase density of 10% leads to the cost overestimation of $1.4 million for the absorption column for a 400 MW coal-fired power plant. Therefore, the development of the flue gas density model and liquid phase density and viscosity models of the aqueous amine solution with CO2 loading should be prioritized.

  • 49. Roskilly, A. P.
    et al.
    Yan, Jinyue
    KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Energy Processes. Mälardalen Univ..
    Sustainable thermal energy management2017In: APPLIED ENERGY, ISSN 0306-2619, Vol. 186, p. 249-250Article in journal (Refereed)
  • 50. Salman, C. A.
    et al.
    Naqvi, M.
    Thorin, E.
    Yan, Jerry
    KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Energy Processes. Mälardalen University, Sweden.
    A polygeneration process for heat, power and DME production by integrating gasification with CHP plant: Modelling and simulation study2017In: Proceedings of the 9th International Conference on Applied Energy, Elsevier, 2017, Vol. 142, p. 1749-1758Conference paper (Refereed)
    Abstract [en]

    Biofuels are a good substitute for the transport sector petroleum fuels to minimize carbon footprint and greenhouse gases emissions. Di-Methyl Ether (DME) is one such alternative with properties similar to liquefied petroleum gas but with lower SOx, NOx, and particulate emissions. In this work, a polygeneration process, integrating an existing combined heat and power (CHP) plant with biomass gasification to synthesize DME, is proposed and modelled. Process integration is based on a hypothesis that the CHP plant provides the necessary heat to run the co-located gasification plant for DME synthesis and the waste heat from the gasification process is recovered and transferred to the CHP plant. The feed for gasification is taken as refuse derived fuel (RDF) instead of conventional wood derived biomass. The process integration leads to higher overall combined efficiency (up to 71%) which is greater than stand-alone efficiencies (up to 63%) but lower than stand-alone CHP plant efficiency (73.2%). The further technical evaluation shows that the efficiency of the polygeneration process is depends heavily on the gasifier capacity integrated with the existing CHP plant and also on the conversion route selected for DME synthesis i.e. recycling of unconverted syngas to the DME reactor or transferring it to the boiler of the CHP plant. The simulation results also indicate that once-through conversion yields less DME than recycling, but at the same time, once-through conversion affects the district heat and electric power production of the CHP plant lesser than by using the recycling route.

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