Alegría Cía, Patricia
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Alegría Cía
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Patricia
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Ingeniería
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ISC. Institute of Smart Cities
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Publication Open Access Experimental development of a novel thermoelectric generator without moving parts to harness shallow hot dry rock fields(Elsevier, 2022) Alegría Cía, Patricia; Catalán Ros, Leyre; Araiz Vega, Miguel; Rodríguez García, Antonio; Astrain Ulibarrena, David; Ingeniaritza; Institute of Smart Cities - ISC; IngenieríaNowadays, geothermal energy in shallow hot dry rock fields is not exploited enough due to the high economic and environmental impact as well as the lack of scalability of the existing technologies. Here, thermoelectricity has a great future potential due to its robustness, absence of moving parts and modularity. However, the efficiency of a thermoelectric generator depends highly on the heat exchangers. In this work, a novel geothermal thermoelectric generator is experimentally developed, characterizing different configurations of biphasic heat exchangers to obtain low thermal resistances that allow the maximum efficiency in the thermoelectric modules. As a result, robust and passive heat exchangers were obtained with thermal resistances of 0.07 K/W and 0.4 K/W in the hot and cold sides, respectively. The geothermal thermoelectric generator was built with the most effective heat exchangers and was experimented under different temperature and convection conditions, generating 36 W (17 W by a prototype with 10 modules and 19 W by a prototype with 6 modules) for a temperature difference of 160 °C between the heat source and the environment. Furthermore, the experimental development showed that it is possible to increase electricity generation with a more compact generator, since a decrease in the number of modules from 10 to 6 increases the efficiency from 3.72% to 4.06%. With this research, the feasibility of a novel and robust geothermal thermoelectric generator whose working principle is phase change has been experimentally demonstrated, as well as the importance of compactness to maximize its efficiency and thus, power generation.Publication Embargo Diseño, análisis y optimización de un generador termoeléctrico mediante calor geotérmico de origen volcánico(2020) Alegría Cía, Patricia; Astrain Ulibarrena, David; Araiz Vega, Miguel; Escuela Técnica Superior de Ingeniería Industrial, Informática y de Telecomunicación; Industria, Informatika eta Telekomunikazio Ingeniaritzako Goi Mailako Eskola TeknikoaFrente al actual problema energético al que nos enfrentamos, la termoelectricidad aplicada a la energía geotérmica tiene un gran potencial de futuro. Esta tecnología conlleva grandes ventajas como, entre otras, su robustez, fiabilidad, no necesita mantenimiento ya que es una tecnología sin partes móviles, ausencia de ruidos, y es una energía totalmente renovable y limpia. Sin embargo, la eficiencia de un generador termoeléctrico depende en gran medida de los intercambiadores de calor. Por ello es de gran importancia que estos sean lo más eficientes posible. El objetivo de este proyecto es diseñar y estudiar un prototipo de generador termoeléctrico que sea capaz de transformar en electricidad un gradiente de temperaturas entre el ambiente y el calor del suelo del Parque Nacional de Timanfaya. Para ello, se han diseñado y construido intercambiadores de calor específicamente para esta aplicación. La función de estos intercambiadores será transportar el calor con la máxima eficiencia posible desde el interior del sondeo (foco caliente) hasta los módulos termoeléctricos, utilizando una parte de este calor para generar electricidad y otra parte para disiparlo al medio ambiente a través de intercambiadores en el lado frío. El principio de funcionamiento de todos estos intercambiadores será el intercambio de calor por termosifón y cambio de fase. Para lograr el diseño completo, se propusieron y valoraron diferentes soluciones para las diferentes partes que componen el prototipo. Finalmente, se realizó un estudio económico.Publication Open Access Experimental development of a novel thermoelectric generator without moving parts to harness shallow hot dry rock fields(2021) Alegría Cía, Patricia; Rodríguez García, Antonio; Catalán Ros, Leyre; Astrain Ulibarrena, David; Araiz Vega, Miguel; Ingeniería; Institute of Smart Cities - ISC; IngeniaritzaNowadays, geothermal energy in shallow hot dry rocks is not exploited enough due to the high economic and environmental impact as well as the lack of scalability of the existing technologies. Here, thermoelectricity has a great future potential due to its robustness, absence of moving parts and modularity. With this research, the feasibility of a novel and robust geothermal thermoelectric generator whose working principle is phase change has been experimentally demonstrated, as well as the importance of compactness to maximize its efficiency and thus, power generation.