Thermodynamic Analysis of a CO2 Refrigeration Cycle with Integrated Mechanical Subcooling
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Título
Thermodynamic Analysis of a CO2 Refrigeration Cycle with Integrated Mechanical SubcoolingAutoría
Fecha de publicación
2020Editor
MDPICita bibliográfica
NEBOt ANDRÉS, Laura; CALLEJA-ANTA, Danel; SÁNCHEZ GARCÍA-VACAS, Daniel; CABELLO LÓPEZ, Ramón; LLOPIS, Rodrigo (2020). Thermodynamic Analysis of a CO2 Refrigeration Cycle with Integrated Mechanical Subcooling. Energies, v. 13, n. 4Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://www.mdpi.com/1996-1073/13/1/4Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Different alternatives are being studied nowadays in order to enhance the behavior of transcritical CO2 refrigeration plants. Among the most studied options, subcooling is one of the most analyzed methods in the last ... [+]
Different alternatives are being studied nowadays in order to enhance the behavior of transcritical CO2 refrigeration plants. Among the most studied options, subcooling is one of the most analyzed methods in the last years, increasing cooling capacity and Coefficient Of Performance (COP), especially at high hot sink temperatures. A new cycle, called integrated mechanical subcooling cycle, has been developed, as a total-CO2 solution, to provide the subcooling in CO2 transcritical refrigeration cycles. It corresponds to a promising solution from the point of view of energy efficiency. The purpose of this work is to present, for the first time, thermodynamic analysis of a CO2 refrigeration cycle with integrated mechanical subcooling cycle from first and second law approaches. Using simplified models of the components, the optimum operating conditions, optimum gas-cooler pressure, and subcooling degree are determined in order to obtain the maximum COP. The main energy parameters of the system were analyzed for different evaporation levels and heat rejection temperatures. The exergy destruction was analyzed for each component, identifying the elements of the system that introduce more irreversibilities. It has been concluded that the new cycle could offer COP improvements from 11.7% to 15.9% in relation to single-stage cycles with internal heat exchanger (IHX) at 35 °C ambient temperature. [-]
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Energies (2020), v. 13, n. 4Proyecto de investigación
This research was funded by 1) Ministry of Science, Innovation and Universities-Spain (project RTI2018-093501-B-C21), 2) the Ministry of Education, Culture and Sports-Spain (grant FPU16/00151) and 3) the Jaume I University (project UJI-B2017-06).Derechos de acceso
info:eu-repo/semantics/openAccess
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