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Publications (10 of 19) Show all publications
Wegener, M., Isalgué, A., Malmquist, A. & Martin, A. R. (2019). 3E-Analysis of a Bio-Solar CCHP System for theAndaman Islands, India—A Case Study. Energies, 12(6)
Open this publication in new window or tab >>3E-Analysis of a Bio-Solar CCHP System for theAndaman Islands, India—A Case Study
2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 6Article in journal (Refereed) Published
Abstract [en]

Energy services are especially expensive on remote islands due to longer and more unstable fuel supply chains. In this paper, different renewable energy systems utilizing locally available biomass and solar energy are proposed as alternatives for a hotel resort on Neil Island, India. Based on local demand data, commercial information, and scientific literature, four cases are modelled with the simulation software HOMER and their economic, energetic, as well as ecological (3E) performances are compared. The robustness of each case configuration is tested with a sensitivity analysis. The results show that a biomass-based, solar-assisted combined cooling, heating, and power (CCHP) system offers an economic saving potential of more than 500,000 USD over twenty years and could decrease CO2 emissions by 365 t per year. When not applying CCHP measures, system performance is significantly worsened. A solar and battery-assisted diesel generator system shows similar economic outcomes as the CCHP system but worse ecological performance. Implementing the biomass-based CCHP system could improve the ecological footprint of the island, substantially decrease expenditure for the hotel owner, and generate a new source of income for surrounding farmers through biomass selling.

Place, publisher, year, edition, pages
Basel, Switzerland: MDPI, 2019
Keywords
Renewable energy; biomass gasification; bio-solar; small-scale CCHP
National Category
Energy Engineering
Research subject
Energy Technology
Identifiers
urn:nbn:se:kth:diva-247950 (URN)10.3390/en12061113 (DOI)000465616800079 ()2-s2.0-85065974903 (Scopus ID)
Note

QC 20190402

Available from: 2019-03-28 Created: 2019-03-28 Last updated: 2019-06-11Bibliographically approved
Villarroel-Schneider, J., Malmquist, A., Araoz, J. A., Marti-Herrero, J. & Martin, A. R. (2019). Performance Analysis of a Small-Scale Biogas-Based Trigeneration Plant: An Absorption Refrigeration System Integrated to an Externally Fired Microturbine. Energies, 12(20), Article ID 3830.
Open this publication in new window or tab >>Performance Analysis of a Small-Scale Biogas-Based Trigeneration Plant: An Absorption Refrigeration System Integrated to an Externally Fired Microturbine
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2019 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 12, no 20, article id 3830Article in journal (Refereed) Published
Abstract [en]

Trigeneration or combined cooling, heat and power (CCHP) systems fueled by raw biogas can be an interesting alternative for supplying electricity and thermal services in remote rural areas where biogas can be produced without requiring sophisticated equipment. In this sense, this study considers a performance analysis of a novel small-scale CCHP system where a biogas-fired, 5 kW(el) externally fired microturbine (EFMT), an absorption refrigeration system (ARS) and heat exchangers are integrated for supplying electricity, refrigeration and hot water demanded by Bolivian small dairy farms. The CCHP solution presents two cases, current and nominal states, in which experimental and design data of the EFMT performance were considered, respectively. The primary energy/exergy rate was used as a performance indicator. The proposed cases show better energy performances than those of reference fossil fuel-based energy solutions (where energy services are produced separately) allowing savings in primary energy utilization of up to 31%. Furthermore, improvements in electric efficiency of the EFMT and coefficient of performance (COP) of the ARS, identified as key variables of the system, allow primary energy savings of up to 37%. However, to achieve these values in real conditions, more research and development of the technologies involved is required, especially for the EFMT.

Place, publisher, year, edition, pages
MDPI, 2019
Keywords
combined cooling, heat and power, CCHP, trigeneration, dairy farm, refrigeration, efficiency, performance, externally fired microturbine
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-265463 (URN)10.3390/en12203830 (DOI)000498391700026 ()2-s2.0-85075075418 (Scopus ID)
Note

QC 20191218

Available from: 2019-12-18 Created: 2019-12-18 Last updated: 2019-12-20Bibliographically approved
Cardozo, E. & Malmquist, A. (2019). Performance comparison between the use of wood and sugarcane bagasse pellets in a Stirling engine micro-CHP system. Applied Thermal Engineering, 159, Article ID 113945.
Open this publication in new window or tab >>Performance comparison between the use of wood and sugarcane bagasse pellets in a Stirling engine micro-CHP system
2019 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 159, article id 113945Article in journal (Refereed) Published
Abstract [en]

The use of locally available agricultural residues is an interesting alternative for residential heat and power generation based on the Stirling engine technology. However, some biomass with high ash content (agricultural residues) may cause operational problems and impact on the performance of the Stirling engine and the overall CHP system. This work is focused on the evaluation of useful parameters of a CHP system based on a 20 kW(th) pellet burner, a 1 kW(e) Stirling engine and a 20 kW(th) residential boiler using wood and sugar cane bagasse pellets. Similar temperatures in the Stirling hot end were found when using both fuels under steady-state and transient conditions. CO emission levels when using bagasse were lower than for wood pellets but slightly higher levels of NOx and higher accumulated ash were found. A fouling factor of the Stirling heat exchanger was found to be around 1.1 m(2) degrees C/kW after two cycles (6 h) and 3.2 m(2) degrees C/kW after three cycles (9 h) of operation when using wood pellets. A linear relation between the Stirling power output and the accumulated ash was assessed which was used to predict a longer operation time using bagasse pellets. This shows that after three cycles of operation with bagasse pellets, without removing accumulated ash, the CHP efficiency is still kept over 83% and for wood pellets, the CHP efficiency was kept over 90%.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Combined heat and power, Bagasse pellet, Polygeneration, Stirling engine, Wood pellet
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-255730 (URN)10.1016/j.applthermaleng.2019.113945 (DOI)000475999100090 ()2-s2.0-85067278426 (Scopus ID)
Note

QC 20190814

Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-08-14Bibliographically approved
Wegener, M., Malmquist, A., Isalgue, A. & Martin, A. R. (2018). Biomass-fired combined cooling, heating and power for small scale applications - A review. Renewable & sustainable energy reviews, 96, 392-410
Open this publication in new window or tab >>Biomass-fired combined cooling, heating and power for small scale applications - A review
2018 (English)In: Renewable & sustainable energy reviews, ISSN 1364-0321, E-ISSN 1879-0690, Vol. 96, p. 392-410Article, review/survey (Refereed) Published
Abstract [en]

The growing demand for energy and the accelerating threats from climate change call for innovative and sustainable solutions to decrease dependency on fossil fuels. Biomass-based, small-scale Combined Cooling, Heating and Power (CCHP) systems are one of these solutions, because they can satisfy the energy demands of the consumer with enhanced flexibility, lower losses, less costs and less environmental pollution as compared to centralized facilities. Due to recent advances in several scientific subfields with relevance to small-scale CCHP, a rapidly increasing amount of literature is now available. Therefore, a structural overview is essential for engineers and researchers. This paper presents a review of the current investigations in small-scale CCHP systems covering biomass-fired concepts and solar extensions. To this end, critical system components are described and analysed according to their specific advantages and drawbacks. Recent case studies have been collected and key findings are highlighted according to each type of prime mover. The results indicate a scientific bias towards the economic viability of such systems and the need for real-life and experiment system data. However, the potential of biomass-fired CCHP systems and of such systems with solar extensions has clearly been recognised. Based on the results, future policy implementations should focus on fostering such systems in areas with high energy costs and to increase energy resilience in developed regions. Additionally research and industry applying novel prime mover technologies should be financially supported.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Small-scale CCHP, Trigeneration, Biomass, Bio-solar
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-237089 (URN)10.1016/j.rser.2018.07.044 (DOI)000446310700030 ()2-s2.0-85051640034 (Scopus ID)
Note

QC 20181024

Available from: 2018-10-24 Created: 2018-10-24 Last updated: 2019-04-12Bibliographically approved
Wang, W., Malmquist, A. & Laumert, B. (2018). Comparison of potential control strategies for an impinging receiver based dish-Brayton system when the solar irradiation exceeds its design value. Energy Conversion and Management, 169, 1-12
Open this publication in new window or tab >>Comparison of potential control strategies for an impinging receiver based dish-Brayton system when the solar irradiation exceeds its design value
2018 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 169, p. 1-12Article in journal (Refereed) Published
Abstract [en]

Potential control strategies for an impinging receiver based dish-Brayton system have been presented for protecting the key components from the risks of overheating when the solar irradiation exceeds its design value. Two of them are selected for a detailed study: changing the effective diameter of the shading device and changing the inlet temperature. A rope-pulley shading device is developed for controlling the shading area in the center of the dish, and the change of the inlet temperature is achieved by applying a bypass at the cold side of the recuperator for reducing the heat transfer rate. Both control strategies can manage the peak temperature on the absorber surface within 1030 °C with an outlet temperature fluctuation between −4.1 and 15.1 °C, so that the impinging receiver can work for long time at any solar direct normal irradiance value. Furthermore, the temperature differences on the absorber surface are between 137.1 °C and 163.8 °C. The cases that are achieved by changing the shield effective diameter are significantly lower (11–26 °C) than the corresponding cases that are achieved by changing the inlet temperature.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Brayton cycle, Conjugate heat transfer, Control strategy, Impinging solar receiver, Solar dish
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-228710 (URN)10.1016/j.enconman.2018.05.045 (DOI)000436885900001 ()2-s2.0-85047262981 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 308952
Note

QC 20180530

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-07-17Bibliographically approved
Ghaem Sigarchian, S., Malmquist, A. & Martin, V. (2018). Design Optimization of a Complex Polygeneration System for a Hospital. Energies, 11(5), Article ID 1071.
Open this publication in new window or tab >>Design Optimization of a Complex Polygeneration System for a Hospital
2018 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 11, no 5, article id 1071Article in journal (Refereed) Published
Abstract [en]

Small-scale decentralized polygeneration systems have several energetic, economic and environmental benefits. However, using multiple energy sources and providing multiple energy services can lead to complicated studies which require advanced optimization techniques for determining optimal solutions. Furthermore, several parameters can influence the design and performance of a polygeneration system. In this study, the effects of heat load, renewable generation and storage units on the optimal design and performance of a polygeneration system for a hypothetical hospital located in northern Italy are investigated. The polygeneration system shows higher performance compared to the reference system, which is based on the separate generation of heat and power. It reduces fuel consumption by 14-32%, CO2 emissions by 10-29% and annualized total cost by 7-19%, for various studied scenarios. The avoided fuel and electricity purchase of the polygeneration system has a positive impact on the economy. This, together with the environmental and energetic benefits if the renewable generation and use of storage devices, indicate the viability and competitiveness of the system.

Place, publisher, year, edition, pages
MDPI, 2018
Keywords
polygeneration, decentralized energy system, optimization, multi-energy system, renewable energy system
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-240241 (URN)10.3390/en11051071 (DOI)000435610300049 ()2-s2.0-85047072937 (Scopus ID)
Note

QC 20181219

Available from: 2018-12-19 Created: 2018-12-19 Last updated: 2018-12-19Bibliographically approved
Ghaem Sigarchian, S., Malmquist, A. & Martin, V. (2018). Design optimization of a small-scale polygeneration energy system in different climate zones in Iran. Energies, 11(5), Article ID 1115.
Open this publication in new window or tab >>Design optimization of a small-scale polygeneration energy system in different climate zones in Iran
2018 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 11, no 5, article id 1115Article in journal (Refereed) Published
Abstract [en]

Design and performance of polygeneration energy systems are highly influenced by several variables, including the climate zone, which can affect the load profile as well as the availability of renewable energy sources. To investigate the effects, in this study, the design of a polygeneration system for identical residential buildings that are located in three different climate zones in Iran has been investigated. To perform the study, a model has previously developed by the author is used. The performance of the polygeneration system in terms of energy, economy and environment were compared to each other. The results show significant energetic and environmental benefits of the implementation of polygeneration systems in Iran, especially in the building that is located in a hot climate, with a high cooling demand and a low heating demand. Optimal polygeneration system for an identical building has achieved a 27% carbon dioxide emission reduction in the cold climate, while this value is around 41% in the hot climate. However, when considering the price of electricity and gas in the current energy market in Iran, none of the systems are feasible and financial support mechanisms or other incentives are required to promote the application of decentralized polygeneration energy systems.

Place, publisher, year, edition, pages
MDPI AG, 2018
Keywords
polygeneration system, climate zone, optimization, combined cooling, heating, and power generation (CCHP), renewable energy, particle swarm optimization (PSO) algorithm, Iran
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-227689 (URN)10.3390/en11051115 (DOI)000435610300093 ()2-s2.0-85047081323 (Scopus ID)
Note

QC 20180530

Available from: 2018-05-11 Created: 2018-05-11 Last updated: 2019-09-20Bibliographically approved
Ghaem Sigarchian, S., Malmquist, A. & Martin, V. (2018). The choice of operating strategy for a complex polygeneration system: A case study for a residential building in Italy. Energy Conversion and Management, 163, 278-291
Open this publication in new window or tab >>The choice of operating strategy for a complex polygeneration system: A case study for a residential building in Italy
2018 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 163, p. 278-291Article in journal (Refereed) Published
Abstract [en]

The operating strategy can affect the optimal solution and performance of a polygeneration energy system. In this study, the effect of operating strategies: following thermal load; following electric load; and modified base load on the optimal solution of a polygeneration system for a residential building complex in the northern part of Italy is investigated. For the optimal solutions, a comparative analysis is carried out considering the techno-economic and environmental performance of the system. The result elaborates on how the benefits achieved in a polygeneration system are influenced by the choice of operating strategy. In the building complex, implementation of the operating strategies shows considerable energetic, economic and environmental benefits compared to conventional separate heat and power generation. The ranges of annualized total cost reduction of 17-19%, carbon dioxide emission reduction of 35-43% and fuel consumption reduction of 30-38% are achieved for the various operating strategies. However, each of the operating strategies has its own advantages and drawbacks which emphasizes the importance of post-processing of the results in order to make the right choice. For example, the following thermal load shows the advantage of a higher carbon dioxide emission reduction. On the other hand, one drawback is its lower self-sustainability in terms of electric power compared to the other strategies.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2018
Keywords
Polygeneration energy system, Renewable energy, Operating strategy, Particle swarm optimization, Optimization, Decentralized energy system
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-228441 (URN)10.1016/j.enconman.2018.02.006 (DOI)000431837400025 ()
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved
Wang, W., Malmquist, A., Aichmayer, L. & Laumert, B. (2018). Transient performance of an impinging receiver: An indoor experimental study. Energy Conversion and Management, 158, 193-200
Open this publication in new window or tab >>Transient performance of an impinging receiver: An indoor experimental study
2018 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 158, p. 193-200Article in journal (Refereed) Published
Abstract [en]

The impinging receiver is a new member of the cavity solar receiver family. In this paper, the transient performance of a prototype impinging receiver has been studied with the help of a Fresnel lens based solar simulator and an externally fired micro gas turbine. The impinging receiver can offer an air outlet temperature of 810 °C at an absorber temperature of 960 °C. The radiative-to-thermal efficiency is measured to be 74.1%. The absorber temperature uniformity is good but high temperature differences have been detected during the ‘cold startup’ process. The temperature changing rate of the receiver is within 3 °C/s for the startup process and 4 °C/s for the shut-down process. In order to avoid quenching effects caused by the impinging jets, the micro gas turbine should be turned off to stop the airflow when the radiative power is off. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Concentrated solar power, Impinging receiver, Solar energy, Transient performance, Absorber temperatures, Micro gas turbines, Outlet temperature, Start-up process, Temperature changing, Thermal efficiency, Gas turbines
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-223143 (URN)10.1016/j.enconman.2017.12.070 (DOI)000424719200018 ()2-s2.0-85040614193 (Scopus ID)
Note

Export Date: 13 February 2018; Article; CODEN: ECMAD; Correspondence Address: Wang, W.; Department of Energy Technology, KTH Royal Institute of TechnologySweden; email: wujun@kth.se. QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-03-26Bibliographically approved
Ghaem Sigarchian, S., Orosz, M. S., Hemond, H. F. & Malmquist, A. (2016). Optimum design of a hybrid PV-CSP-LPG microgrid with Particle Swarm Optimization technique. Applied Thermal Engineering, 109, 1031-1036
Open this publication in new window or tab >>Optimum design of a hybrid PV-CSP-LPG microgrid with Particle Swarm Optimization technique
2016 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 109, p. 1031-1036Article in journal (Refereed) Published
Abstract [en]

Designing an energy system using multiple energy sources including renewables and providing multiple energy services (e.g. electricity, heating) can enhance the reliability and efficiency of the system while mitigating the environmental footprint. However, interaction among various components, variation of the energy demand profile, and local ambient conditions make design optimization a complex task, and suggesting that efficient simulation tools and optimization techniques can help designers to determine the best solutions within a reasonable timeframe and budget. Previous work on a dynamic microgrid simulation tool called "u-Grid" used an exhaustive search technique to find optimum configurations. However, the high computational cost of the exhaustive search was a motivation to explore alternative optimization methods to improve the optimization process and also to enhance search speed. In this paper Particle Swarm Optimization (PSO) has been presented as a global optimizer and incorporated within the problem context. Results from the exhaustive search have been used as a benchmark for testing and validation of the newly introduced optimization technique. The result shows that the PSO method is an efficient technique which has the ability to determine a high quality design solution for an optimized microgrid with a relatively low computational cost. Applying this PSO-based algorithm to the case study has reduced the total computation time a factor of about 6 in a significantly smaller computational platform.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Hybrid energy system, Polygeneration, Optimization, Particle Swarm Optimization, Microgrid
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-199979 (URN)10.1016/j.applthermaleng.2016.05.119 (DOI)000386738600023 ()2-s2.0-84992197068 (Scopus ID)
Funder
StandUp
Note

QC 20170206

Available from: 2017-02-06 Created: 2017-01-20 Last updated: 2018-05-17Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-4479-344X

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