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Publications (10 of 113) Show all publications
Wang, L., Liang, Z., Cai, M., Zhang, Y. & Yan, J. (2019). Adaptive structural control of floating wind turbine with application of MR damper. In: Innovative Solutions for Energy Transitions: . Paper presented at 10th International Conference on Applied Energy, ICAE 2018; Hong Kong; China; 22 August 2018 through 25 August 2018 (pp. 254-259). Elsevier, 158
Open this publication in new window or tab >>Adaptive structural control of floating wind turbine with application of MR damper
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2019 (English)In: Innovative Solutions for Energy Transitions, Elsevier, 2019, Vol. 158, p. 254-259Conference paper, Published paper (Refereed)
Abstract [en]

Floating wind turbine has become the most promising technology for deep-sea wind power generation. Therefore, some means to reduce the structural load for stabilizing the wind turbine has been developing. In this paper, a semi-active structural control is realized by replacing the damper in passive TMD with the magnetorheological (MR) damper. The damping force of the MR damper can be changed by altering the voltage applied to it. A simple and convenient control method is designed, which includes adaptive control force design and retrogression controller. The simulation results show that the semi-active control method has a good damping effect, which mitigates much of the structural load with respect to the passive structural control.

Place, publisher, year, edition, pages
Elsevier, 2019
Series
Energy Procedia, ISSN 1876-6102 ; 158
Keywords
Floating wind turbine, Magnetorheological damper, Structural control
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-251842 (URN)10.1016/j.egypro.2019.01.085 (DOI)000471031700042 ()2-s2.0-85063890294 (Scopus ID)
Conference
10th International Conference on Applied Energy, ICAE 2018; Hong Kong; China; 22 August 2018 through 25 August 2018
Note

QC 20190524

Available from: 2019-05-24 Created: 2019-05-24 Last updated: 2019-07-29Bibliographically approved
Yan, J. & Zhang, Z. (2019). Carbon Capture, Utilization and Storage (CCUS). Applied Energy, 235, 1289-1299
Open this publication in new window or tab >>Carbon Capture, Utilization and Storage (CCUS)
2019 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 235, p. 1289-1299Article in journal (Refereed) Published
Place, publisher, year, edition, pages
ELSEVIER SCI LTD, 2019
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-246281 (URN)10.1016/j.apenergy.2018.11.019 (DOI)000458942800104 ()2-s2.0-85056879138 (Scopus ID)
Note

QC 20190325

Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-04-04Bibliographically approved
Barbarelli, S., Castiglione, T., Zupone, G. L., Bova, S. & Yan, J. (2019). CFD Investigation of the Open Center on the Performance of a Tidal Current Turbine. In: Renewable Energy Integration with Mini/Microgrid: . Paper presented at 2018 Renewable Energy Integration with Mini/Microgrid, REM 2018; Rhodes; Greece; 28 September 2018 through 30 September 2018 (pp. 28-33). Elsevier, 159
Open this publication in new window or tab >>CFD Investigation of the Open Center on the Performance of a Tidal Current Turbine
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2019 (English)In: Renewable Energy Integration with Mini/Microgrid, Elsevier, 2019, Vol. 159, p. 28-33Conference paper, Published 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.

Place, publisher, year, edition, pages
Elsevier, 2019
Series
Energy Procedia, ISSN 1876-6102 ; 159
Keywords
CFD analysis, marine turbine, power coefficient, tidal current
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-251896 (URN)10.1016/j.egypro.2018.12.013 (DOI)000471291100005 ()2-s2.0-85063779800 (Scopus ID)
Conference
2018 Renewable Energy Integration with Mini/Microgrid, REM 2018; Rhodes; Greece; 28 September 2018 through 30 September 2018
Note

QC 20190523

Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-07-24Bibliographically approved
Yan, J., Yang, Y., Campana, P. E. & He, J. (2019). City-level analysis of subsidy-free solar photovoltaic electricity price, profits and grid parity in China. Nature Energy, 4(8), 709-717
Open this publication in new window or tab >>City-level analysis of subsidy-free solar photovoltaic electricity price, profits and grid parity in China
2019 (English)In: Nature Energy, ISSN 2058-7546, Vol. 4, no 8, p. 709-717Article in journal (Refereed) Published
Abstract [en]

In recent years, China has become not just a large producer but a major market for solar photovoltaics (PV), increasing interest in solar electricity prices in China. The cost of solar PV electricity generation is affected by many local factors, making it a challenge to understand whether China has reached the threshold at which a grid-connected solar PV system supplies electricity to the end user at the same price as grid-supplied power or the price of desulfurized coal electricity, or even lower. Here, we analyse the net costs and net profits associated with building and operating a distributed solar PV project over its lifetime, taking into consideration total project investments, electricity outputs and trading prices in 344 prefecture-level Chinese cities. We reveal that all of these cities can achieve-without subsidies-solar PV electricity prices lower than grid-supplied prices, and around 22% of the cities' solar generation electricity prices can compete with desulfurized coal benchmark electricity prices.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-257458 (URN)10.1038/s41560-019-0441-z (DOI)000481484400019 ()2-s2.0-85070785396 (Scopus ID)
Note

QC 20190830

Available from: 2019-08-30 Created: 2019-08-30 Last updated: 2019-08-30Bibliographically approved
Zhang, C., Campana, P. E., Liu, C., Wang, K. & Yan, J. (2019). Crowdfunding preferences for a sustainable milk product with integrated photovoltaic water pumping system in China. Applied Energy, 255, Article ID 113694.
Open this publication in new window or tab >>Crowdfunding preferences for a sustainable milk product with integrated photovoltaic water pumping system in China
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2019 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 255, article id 113694Article in journal (Refereed) Published
Abstract [en]

This paper studies the role of potential investors in financing renewable energy systems—specifically, relating to crowdfunding as a financing mechanism, with the enhancement of internet and social-media tools. The research question in this study is whether crowdfunding with a novel socio-technical product reward program attracts potential customers to a more sustainable milk product with a specific integrated photovoltaic water pumping (PVWP) system. The particular case study we empirically investigated is product reward crowdfunding in dairy milk production in China. The milk production chain was supplied by PVWP system integration, which generated solar energy both for feed production for dairy cows and for the operation of dairy farms. 48 semi-structured in-depth interviews were conducted between the research team and customers in order to perform qualitative analyses of the determinants of customers’ milk purchase behaviors. In addition, 357 online surveys were collected for quantitative analysis. Binary and ordered probit regressions were employed to use survey date to systematically estimate purchase intention and willingness-to-pay for sustainable milk. Customer behaviors, environmental consciousness, and individual socio-demographic factors were investigated as potential explanatory variables. Over 82% of the survey participants showed intentions to purchase the sustainable milk with the PVWP system. In the survey and interview samples, results showed that milk quality, nutrition improvement, emissions reduction, and environmental benefits attributed to the integrated PVWP system were the major factors considered by interviewees who showed intentions to purchase the crowdfunded dairy milk. Regression model results suggested that potential customers with higher income levels, and those of parenting age, and those with young children or planning to have children, had a higher willingness-to-pay than other customers for the crowdfunded sustainable dairy milk. The familiarity with and popularity of online shopping and pre-sale purchases in China made customers more open to and proactive towards pre-pay and crowdfunding mechanisms. This article evaluated key factors which may influence potential customers for crowdfunding, and used a discrete choice model to estimate customers’ willingness-to-pay for reward-based projects. These results could help producers of sustainable milk products to identify potential target groups in China and estimate market demand. This exploratory study could provide a framework with both quantitative and qualitative assessment of crowdfunding for renewable energy systems in a national or international context.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Crowdfunding, Discrete choice model, Photovoltaic water pumping, Sustainable milk, Willingness-to-pay, Crowdsourcing, Dairy products, Emission control, Investments, Pumps, Regression analysis, Sales, Solar energy, Surveys, Sustainable development, Discrete choice models, Willingness to pay, Dairies, alternative energy, dairy farming, demand analysis, market conditions, milk, milk production, photovoltaic system, pumping, questionnaire survey, sustainability
National Category
Energy Engineering Transport Systems and Logistics
Research subject
Industrial Economics and Management
Identifiers
urn:nbn:se:kth:diva-263477 (URN)10.1016/j.apenergy.2019.113694 (DOI)2-s2.0-85071887585 (Scopus ID)
Note

QC20191205

Available from: 2019-12-05 Created: 2019-12-05 Last updated: 2019-12-05Bibliographically approved
Zhang, H., Li, X., Liu, X. & Yan, J. (2019). Enhancing fuel cell durability for fuel cell plug-in hybrid electric vehicles through strategic power management. Applied Energy, 241, 483-490
Open this publication in new window or tab >>Enhancing fuel cell durability for fuel cell plug-in hybrid electric vehicles through strategic power management
2019 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 241, p. 483-490Article in journal (Refereed) Published
Abstract [en]

Fuel cell plug-in hybrid electric vehicles (FC-PHEVs) can have extended range while utilizing cheap grid electricity, but has poor durability of onboard fuel cells due to dynamic loading. In this study, fuel cell durability is enhanced significantly for a novel configuration of FC-PHEVs with three fuel cell stacks through strategic power management by making each fuel cell stack work only at a fixed operating point (i.e., constant output power) and by shortening its active time (operation) via on-off switching control. A hysteresis control strategy of power management is designed to make the active time evenly distributed over the three fuel cell stacks and to reduce the number of on-off switching. The results indicate that the durability of the onboard fuel cells can be increased 11.8, 4.8 and 6.9 times, respectively, for an urban, highway and a combined urban-highway driving cycle. This enhanced fuel cell durability is derived from the fact that the average power demand of real-time driving cycles is only a fraction of the maximum power that FC-PHEVs could provide, and substantially increased durability can be used to reduce the over-design, hence the cost, of fuel cells.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD, 2019
Keywords
Plug-in hybrid electric vehicles (PHEVs), Fuel cell architecture, PEM fuel cell, Power split, Optimal control
National Category
Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-252622 (URN)10.1016/j.apenergy.2019.02.040 (DOI)000465509500037 ()2-s2.0-85062688030 (Scopus ID)
Note

QC 20190603

Available from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-06-03Bibliographically approved
Mancuso, M. V., Campana, P. E. & Yan, J. (2019). Evaluation of grid-connected micro-grid operational strategies. In: Innovative Solutions for Energy Transitions: . Paper presented at 10th International Conference on Applied Energy, ICAE 2018; Hong Kong; China; 22 August 2018 through 25 August 2018 (pp. 1273-1278). Elsevier, 158
Open this publication in new window or tab >>Evaluation of grid-connected micro-grid operational strategies
2019 (English)In: Innovative Solutions for Energy Transitions, Elsevier, 2019, Vol. 158, p. 1273-1278Conference paper, Published 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.

Place, publisher, year, edition, pages
Elsevier, 2019
Series
Energy Procedia, ISSN 1876-6102 ; 158
Keywords
Battery, Microgrid, Optimization, Peak shaving, Photovoltaic
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-251846 (URN)10.1016/j.egypro.2019.01.315 (DOI)000471031701099 ()2-s2.0-85063866890 (Scopus ID)
Conference
10th International Conference on Applied Energy, ICAE 2018; Hong Kong; China; 22 August 2018 through 25 August 2018
Note

QC 20190523

Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-07-24Bibliographically approved
Niu, Z., Yu, J., Cui, X., Yang, X., Sun, Y. & Yan, J. (2019). Experimental investigations on the thermal energy storage performance of shell and tube unit with composite phase change materials. In: Innovative Solutions for Energy Transitions: . Paper presented at 10th International Conference on Applied Energy, ICAE 2018; Hong Kong; China; 22 August 2018 through 25 August 2018 (pp. 4889-4896). Elsevier, 158
Open this publication in new window or tab >>Experimental investigations on the thermal energy storage performance of shell and tube unit with composite phase change materials
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2019 (English)In: Innovative Solutions for Energy Transitions, Elsevier, 2019, Vol. 158, p. 4889-4896Conference paper, Published 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.

Place, publisher, year, edition, pages
Elsevier, 2019
Series
Energy Procedia, ISSN 1876-6102 ; 158
Keywords
Fined tube, Melting phase change, Metal foam, Thermal energy storage
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-251848 (URN)10.1016/j.egypro.2019.01.704 (DOI)000471031705039 ()2-s2.0-85063862517 (Scopus ID)
Conference
10th International Conference on Applied Energy, ICAE 2018; Hong Kong; China; 22 August 2018 through 25 August 2018
Note

QC 20190524

Available from: 2019-05-24 Created: 2019-05-24 Last updated: 2019-07-24Bibliographically approved
Salman, C. A., Schwede, S., Thorin, E., Li, H. & Yan, J. (2019). Identification of thermochemical pathways for the energy and nutrient recovery from digested sludge in wastewater treatment plants. In: Innovative Solutions for Energy Transitions: . Paper presented at 10th International Conference on Applied Energy, ICAE 2018; Hong Kong; China; 22 August 2018 through 25 August 2018 (pp. 1317-1322). Elsevier, 158
Open this publication in new window or tab >>Identification of thermochemical pathways for the energy and nutrient recovery from digested sludge in wastewater treatment plants
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2019 (English)In: Innovative Solutions for Energy Transitions, Elsevier, 2019, Vol. 158, p. 1317-1322Conference paper, Published paper (Refereed)
Abstract [en]

There are several restrictions and limitations on the emissions and disposal of materials and pollutants related to wastewater treatment plants (WWTPs) emphasizing improvement of current processes and development of new methods. Process integration is one way to use all fractions of waste for improved efficiency. WWTPs produces sludge which is usually anaerobically digested to produce biogas and a byproduct called digestate. Digestate is an organic material that contains macro and micronutrients such as nitrogen, phosphorous, and potassium and also contains heavy metals. Digestate is mainly used for agricultural applications because of the presence of nutrients. However, digestate also contains energy in the form of carbon and hydrogen which can be harnessed through various processes and integrated with nitrogen recovery process. This study aims to recover the energy and nutrients from digestate through thermochemical treatment processes. Combustion, pyrolysis, and gasification are assessed and compared in this work. An ammonia stripping method is assumed to recover nitrogen from digestate. The thermochemical processes are heat integrated with ammonia stripping through modeling and simulation. Results show that almost half of the energy present in digested sludge is required for its drying. Moreover, nitrogen recovery also requires much energy. The combustion and gasification of digested sludge give better results than pyrolysis. The heat integration becomes feasible when the auxiliary biogas is also burned along with products from the thermochemical treatment of sludge.

Place, publisher, year, edition, pages
Elsevier, 2019
Series
Energy Procedia, ISSN 1876-6102 ; 158
Keywords
Combustion, Digestate, Gasification, Pyrolysis, Wastewater treatment
National Category
Renewable Bioenergy Research
Identifiers
urn:nbn:se:kth:diva-251844 (URN)10.1016/j.egypro.2019.01.325 (DOI)000471031701105 ()2-s2.0-85063872188 (Scopus ID)
Conference
10th International Conference on Applied Energy, ICAE 2018; Hong Kong; China; 22 August 2018 through 25 August 2018
Note

QC 20190524

Available from: 2019-05-24 Created: 2019-05-24 Last updated: 2019-07-24Bibliographically approved
Tan, Y., Nookuea, W., Li, H., Thorin, E. & Yan, J. (2019). Impacts of thermos-physical properties on plate-fin multi-stream heat exchanger design in cryogenic process for CO 2 capture. Applied Thermal Engineering, 1445-1453
Open this publication in new window or tab >>Impacts of thermos-physical properties on plate-fin multi-stream heat exchanger design in cryogenic process for CO 2 capture
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2019 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, p. 1445-1453Article in journal (Refereed) Published
Abstract [en]

Oxy-fuel combustion is one of the most promising technologies for CO 2 capture for power plants. In oxy-fuel combustion plants, cryogenic process can be applied for CO 2 purification because the main impurities in flue gas are non-condensable gases. The multi-stream plate-fin heat exchanger is one of the most important components in the CO 2 cryogenic system. In-depth understanding of the impacts of property on the heat exchanger is of importance for appropriate design. In order to investigate the impacts of properties on sizing the heat exchanger and to further identify the key properties to be prioritized for the property model development, this paper presented the design procedure for the plate-fin multi-stream heat exchanger for the CO 2 cryogenic process. Sensitivity study was conducted to analyze the impacts of thermos-physical properties including density, viscosity, heat capacity and thermal conductivity. The results show that thermal conductivity has the most significant impact and hence, developing a more accurate thermal conductivity model is more important for the heat exchanger design. In addition, even though viscosity has less significant impact compared to other properties, the larger deviation range of current viscosity models may lead to higher uncertainties in volume design and annual capital cost of heat exchanger.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
CO 2 mixture, Cryogenic process, Heat exchanger, Sensitivity study, Thermos-physical property, Air purification, Carbon dioxide, Chromium compounds, Combustion, Cryogenics, Design, Fins (heat exchange), Fuels, Gas fuel purification, Gas plants, Heat exchangers, Specific heat, Viscosity, Appropriate designs, Heat exchanger design, In-depth understanding, Non-condensable gas, Plate-fin heat exchanger, Sensitivity studies, Thermal conductivity model, Thermal conductivity
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-248171 (URN)10.1016/j.applthermaleng.2018.12.066 (DOI)000460492300127 ()2-s2.0-85059479126 (Scopus ID)
Note

QC 20190425

Available from: 2019-04-25 Created: 2019-04-25 Last updated: 2019-10-17Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-0300-0762

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