Browsing by Autor "Joseph Adhemar Araoz Ramos"

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Development and validation of a thermodynamic model for the performance analysis of a gamma Stirling engine prototype
(Elsevier BV, 2015) Joseph Adhemar Araoz Ramos; Evelyn Cardozo; Marianne Salomón Popa; Lucio Alejo; Torsten Fransson
Non-ideal Stirling engine thermodynamic model suitable for the integration into overall energy systems
(Elsevier BV, 2014) Joseph Adhemar Araoz Ramos; Marianne Salomón Popa; Lucio Alejo; Torsten Fransson
Numerical simulation for the design analysis of kinematic Stirling engines
(Elsevier BV, 2015) Joseph Adhemar Araoz Ramos; Marianne Salomón Popa; Lucio Alejo; Torsten Fransson
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 Martin
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 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.
Performance Analysis of a Stirling Engine Hybrid Power System
(Multidisciplinary Digital Publishing Institute, 2020) Pablo Jimenez Zabalaga; Evelyn Cardozo; Luis A. Choque Campero; Joseph Adhemar Araoz Ramos
The Bolivian government’s concerns that are related to reducing the consumption of diesel fuel, which is imported, subsidized, and provided to isolated electric plants in rural communities, have led to the implementation of hybrid power systems. Therefore, this article presents the performance analysis in terms of energy efficiency, economic feasibility, and environmental sustainability of a photovoltaic (PV)/Stirling battery system. The analysis includes the dynamic start-up and cooling phases of the system, and then compares its performance with a hybrid photovoltaic (PV)/diesel/battery system, whose configuration is usually more common. Both systems were initially optimized in size using the well-known energy optimization software tool, HOMER. An estimated demand for a hypothetical case study of electrification for a rural village of 102 households, called “Tacuaral de Mattos”, was also considered. However, since the characteristics of the proposed systems required a detailed analysis of its dynamics, a dynamic model that complemented the HOMER analysis was developed using MATLAB Simulink TM 8.9. The results showed that the PV/Stirling battery system represented a higher performance option to implement in the electrification project, due to its good environmental sustainability (69% savings in CO2 emissions), economic criterion (11% savings in annualized total cost), and energy efficiency (5% savings in fuel energy conversion).
Techno-economic assessment of high variable renewable energy penetration in the Bolivian interconnected electric system
(KU Leuven, 2019) Ray Rojas Candia; Sergio Balderrama; Joseph Adhemar Araoz Ramos; Miquélez Vicente Senosiain; Gabriela Peña Balderrama; Hernan Jaldín Florero; Sylvain Quoilin
Bolivia plans significant investments in conventional and renewable energy projects before 2025. Deployment of large hydro-power, wind and solar projects are foreseen in the investment agenda. However and despite the large renewable potential in the country non-conventional renewable technologies are not yet considered to be a main source in the supply chain. The aim of this article is to evaluate the flexibility of the Bolivian power generation system in terms of energy balancing, electricity generation costs and power plants scheduling in a scenario that considers large solar and wind energy technology deployment. This is done using an open source unit commitment and optimal dispatch model (Dispa-SET) developed by the Joint Research Center of the European Commission. National data for existing infrastructure, committed and planned energy projects are used to assess the case of Bolivia. The base scenario consider all techno-economic data of the Bolivian power system up to 2016. A harmonized dataset is gathered and released as open data to allow other researchers to run and re-use the model. This model is then used to simulate scenarios with different levels of solar and wind energy deployment. Results from the analysis show that an energy mix with participation of solar and wind technology with values lower than 30% is technically feasible and indicates that further grid reinforcements are required.