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Sistema de almacenamiento de energía térmica mediante calor latente con eritritol como material de cambio de fase
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Abstract(s)
RESUMEN: Un material con cambio de fase tiene la propiedad de almacenar o liberar energía en forma de calor latente. A continuación, se presentan los resultados obtenidos en la construcción de un sistema de almacenamiento de energía térmica donde se utilizó eritritol como material de cambio de fase. El prototipo utilizó 31.4 kg de eritritol (punto de fusión de 118°C, calor latente de 340 kJ/kg), es calentado hasta 135°C y se determinó una energía almacenada de 17.17 MJ, para almacenar esa energía se necesitaron 9.8 horas y el sistema presento una eficiencia de 48.66%. El sistema actualmente tiene la capacidad de mantener la energía durante 2 días solo considerando las pérdidas por convección natural. Para simular el proceso de extracción de energía del sistema se considera un coeficiente por convección forzada de 3000 W/m2 K en el intercambiador de calor de aletas anulares de espesor constante, de esta forma el sistema se descarga en 24 horas. Se pueden disponer de hasta 10.51 MJ diarios en un periodo de 9.5 horas y al día siguiente volver a cargarlo durante 6 horas. El prototipo fue simulado con una precisión de 91%.
ABSTRACT: A material with phase change has the property of storing or releasing energy in the form of latent heat. The results obtained in the construction of a thermal energy storage system where erythritol was used as a phase change material are presented below. The prototype used 31.4 kg of erythritol (melting point of 118 ° C, latent heat of 340 kJ / kg), is heated to 135 ° C and a stored energy of 17.17 MJ was determined, to store that energy it took 9.8 hours and The system presented an efficiency of 48.66%. The system currently has the capacity to maintain energy for 2 days only considering losses due to natural convection. To simulate the energy extraction process of the system, a forced convection coefficient of 3000 W / m2 K is considered in the heat exchanger of annular fins of constant thickness, in this way the system is discharged in 24 hours. You can have up to 10.51 MJ daily in a period of 9.5 hours and the next day recharge it for 6 hours. The prototype was simulated with an accuracy of 91%.
ABSTRACT: A material with phase change has the property of storing or releasing energy in the form of latent heat. The results obtained in the construction of a thermal energy storage system where erythritol was used as a phase change material are presented below. The prototype used 31.4 kg of erythritol (melting point of 118 ° C, latent heat of 340 kJ / kg), is heated to 135 ° C and a stored energy of 17.17 MJ was determined, to store that energy it took 9.8 hours and The system presented an efficiency of 48.66%. The system currently has the capacity to maintain energy for 2 days only considering losses due to natural convection. To simulate the energy extraction process of the system, a forced convection coefficient of 3000 W / m2 K is considered in the heat exchanger of annular fins of constant thickness, in this way the system is discharged in 24 hours. You can have up to 10.51 MJ daily in a period of 9.5 hours and the next day recharge it for 6 hours. The prototype was simulated with an accuracy of 91%.
Description
CIES2020 - XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar
Keywords
Solar energy Energy storage
Citation
Sánchez, V.G.O... [et.al.] - Sistema de almacenamiento de energía térmica mediante calor latente con eritritol como material de cambio de fase. In: CIES2020: As Energias Renováveis na Transição Energética: Livro de Comunicações do XVII Congresso Ibérico e XIII Congresso Ibero-americano de Energia Solar. Helder Gonçalves, Manuel Romero (Ed.). Lisboa, Portugal: LNEG, 3-5 Novembro, 2020, p. 503-510
Publisher
LNEG - Laboratório Nacional de Energia e Geologia