Change search
Link to record
Permanent link

Direct link
BETA
Publications (10 of 21) Show all publications
Villarroel-Schneider, J., Mainali, B., Marti-Herrero, J., Malmquist, A., Martin, A. R. & Alejo, L. (2020). Biogas based polygeneration plant options utilizing dairy farms waste: A Bolivian case. Sustainable Energy Technologies and Assessments, 37, Article ID UNSP 100571.
Open this publication in new window or tab >>Biogas based polygeneration plant options utilizing dairy farms waste: A Bolivian case
Show others...
2020 (English)In: Sustainable Energy Technologies and Assessments, ISSN 2213-1388, E-ISSN 2213-1396, Vol. 37, article id UNSP 100571Article in journal (Refereed) Published
Abstract [en]

This study presents a comparative techno-economic feasibility analysis for two polygeneration plant solutions, applied to low-income dairy farms in Bolivia. The first option considers an internally fired microturbine (IFMT) and, the second, an internal combustion engine (ICE). They are integrated with an absorption refrigeration system and a fertilizer dryer. Biogas, produced with farms waste, fuels these power generators. The levelized costs of biogas for cooking, electricity, cooling and fertilizers were determined. The cost of biogas, for both options, was found to be 0.020 USD/kWh, which is lower than the subsidized price of LPG. The most competitive cost of electricity was determined for the ICE plant option; it was found to be 0.082 USD/kWh and is lower than the subsidized cost of fossil fuel-based electricity. The cost of cooling was found to be around 0.082 USD/kWh, which is slightly higher than the cost of cooling supplied by using grid electricity. In a realistic scenario, the shorter payback period was found to be 4.4 years for the ICE plant option. From this, the ICE-based plant was found as the most feasible option. Additionally, if no subsidies are applied to the fossil fuel-based services, the proposed polygeneration systems are a highly competitive alternative.

Place, publisher, year, edition, pages
ELSEVIER, 2020
Keywords
Polygeneration plant, Techno-economic study, Biogas, Dairy farm, Energy services, Electricity, Cooling, Fertilizer
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-270895 (URN)10.1016/j.seta.2019.100571 (DOI)000514838400008 ()2-s2.0-85075041947 (Scopus ID)
Note

QC 20200324

Available from: 2020-03-24 Created: 2020-03-24 Last updated: 2020-03-24Bibliographically approved
Wegener, M., Ordóñez, C. L., Isalgué, A., Malmquist, A. & Martin, A. R. (2020). How much does it cost to go off-grid with renewables?: A case study of a polygeneration system for a neighbourhood in hermosillo, Mexico. In: 11th International Conference on Sustainability and Energy in Buildings, SEB 2019: . Paper presented at 11th International Conference on Sustainability and Energy in Buildings, SEB 2019, 4-5 July 2019, Budapest, Hungary (pp. 395-405). Springer
Open this publication in new window or tab >>How much does it cost to go off-grid with renewables?: A case study of a polygeneration system for a neighbourhood in hermosillo, Mexico
Show others...
2020 (English)In: 11th International Conference on Sustainability and Energy in Buildings, SEB 2019, Springer , 2020, p. 395-405Conference paper, Published paper (Refereed)
Abstract [en]

As governments and companies struggle to meet their own objectives for the energy transition, more innovative social and technological measures are needed to reduce Greenhouse Gas (GHG) emissions. For this purpose, an assessment of an off-grid polygeneration system, which can serve the electric and cooling demand of a neighbourhood in Hermosillo, Mexico, has been conducted. Energy computations have been done, the energy demand of one dwelling has been measured to ascertain the correctness of the computations, and a demand model for the entire neighbourhood has been created. Based on the model, an off-grid polygeneration system has been designed, which uses a biodiesel engine, PV panels, and an absorption chiller. The system has been optimized for its economic performance and is compared to the currently used system. The results show that the polygeneration system with higher energy efficiency could reduce GHG emissions down to 14%. However, electricity in Hermosillo is heavily subsidized making it harder for innovative systems to compete. Moreover, even without the state subsidies to the end user, the polygeneration system has still a nearly 30% higher Net Present Cost (NPC) than the conventional system over its project lifetime of 20 years. Nonetheless, with precise political incentives and further advances in the applied technologies, small-scale renewable polygeneration systems could become cost-efficient alternatives in the near future.

Place, publisher, year, edition, pages
Springer, 2020
Keywords
Bio-solar, Off-grid polygeneration, Urban energy systems, Gas emissions, Greenhouse gases, Photovoltaic cells, Sustainable development, Absorption chillers, Conventional systems, Economic performance, Energy transitions, Poly-generation, Polygeneration system, Energy efficiency
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-268005 (URN)10.1007/978-981-32-9868-2_34 (DOI)2-s2.0-85076483824 (Scopus ID)9789813298675 (ISBN)
Conference
11th International Conference on Sustainability and Energy in Buildings, SEB 2019, 4-5 July 2019, Budapest, Hungary
Note

QC 20200329

Available from: 2020-03-29 Created: 2020-03-29 Last updated: 2020-03-29Bibliographically approved
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
Show others...
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
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4479-344X

Search in DiVA

Show all publications