Browsing by Autor "J. Villarroel-Schneider"
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Item type: Item , Biogas based polygeneration plant options utilizing dairy farms waste: A Bolivian case(Elsevier BV, 2019) J. Villarroel-Schneider; Brijesh Mainali; Jaime Martí-Herrero; Anders Malmquist; Andrew Martin; Lucio AlejoItem type: Item , Energy self-sufficiency and greenhouse gas emission reductions in Latin American dairy farms through massive implementation of biogas-based solutions(Elsevier BV, 2022) J. Villarroel-Schneider; Lena Höglund-Isaksson; Brijesh Mainali; Jaime Martí-Herrero; Evelyn Cardozo; Anders Malmquist; Andrew R. MartinItem type: Item , Open-source model applied for techno-economic optimization of a hybrid solar PV biogas-based polygeneration plant: The case of a dairy farmers’ association in central Bolivia(Elsevier BV, 2023) J. Villarroel-Schneider; Sergio Balderrama; Claudia Sanchez-Solis; Evelyn Cardozo; Anders Malmquist; Andrew R. MartinProper sizing of energy systems is a key aspect that allows avoiding overestimated installation costs or failures in operation and dispatch. However, most of the available sizing tools focus on systems dedicated only to electrical loads, omitting combined energy systems with simultaneous supply of various thermal demands. This study presents an adaptation of an existing open access techno-economic optimization model for broadening the design tool for small-scale energy systems supplying both, electrical and thermal needs. For this, a new typology of an energy system was proposed considering the use of biogas, solar energy and adding thermal components. This was followed by modifying the model framework, constraints equations and objective function, which is the net present cost of the system. Once the design tool was verified a model was constructed to analyse the feasibility of a polygeneration plant for an association of 30 small dairy farms. The developed model was able to optimize the sizing of the main system components for different proposed scenarios, encompassing supply of electricity, refrigeration, biogas for cooking and fertilizers. For the selected application it was found that the aggregated cost of producing electricity and heat ranges from 0.044 to 0.070 USD/kWh; the penetration of solar energy can reach up to 32%; while the annual potential savings of CO2 emissions of applying the solution ranges from 109 to 127 ton of CO2.Item type: Item , Performance Analysis of a Small-Scale Biogas-Based Trigeneration Plant: An Absorption Refrigeration System Integrated to an Externally Fired Microturbine(Multidisciplinary Digital Publishing Institute, 2019) J. Villarroel-Schneider; Anders Malmquist; Joseph Adhemar Araoz Ramos; Jaime Martí-Herrero; Andrew MartinTrigeneration 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 kWel 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.Item type: Item , Techno-economic optimization model for polygeneration hybrid energy storage systems using biogas and batteries(Elsevier BV, 2020) Moritz Wegener; J. Villarroel-Schneider; Anders Malmquist; A. Isalgué; Andrew R. Martin; Viktoria MartinItem type: Item , Techno-Economic Study of a Biogas-Based Polygeneration Plant for Small Dairy Farms in Central Bolivia(Springer International Publishing, 2019) J. Villarroel-Schneider; Brijesh Mainali; Jaime Martí-Herrero; Anders Malmquist; Andrew R. Martin; Lucio AlejoItem type: Item , Towards a sustainable Bolivian energy system in 2050: The pathway for decarbonization under high renewable potential(Elsevier BV, 2025) Pablo Jimenez Zabalaga; Gauthier Limpens; Sébastien Meyer; Paolo Thiran; J. Villarroel-Schneider; Evelyn Cardozo; Hervé JeanmartItem type: Item , Towards a Sustainable Bolivian Energy System in 2050: The Pathway for Decarbonization Under High Renewable Potential(RELX Group (Netherlands), 2025) Pablo Jimenez Zabalaga; Gauthier Limpens; Sébastien Meyer; Paolo Thiran; J. Villarroel-Schneider; Evelyn Cardozo; Hervé Jeanmart