Theoretical performance evaluation of ejector and economizer with parallel compression configurations in high temperature heat pumps
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Otros documentos de la autoría: Mateu-Royo, Carlos; Navarro-Esbrí, Joaquín; Mota-Babiloni, Adrián; Barragán Cervera, Angel
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Título
Theoretical performance evaluation of ejector and economizer with parallel compression configurations in high temperature heat pumpsFecha de publicación
2020-07-25Editor
ElsevierISSN
0140-7007Cita bibliográfica
MATEU-ROYO, Carlos, et al. Theoretical performance evaluation of ejector and economizer with parallel compression configurations in high temperature heat pumps. International Journal of Refrigeration, 2020, vol. 119, p. 356-365.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://www.sciencedirect.com/science/article/pii/S0140700720303182Versión
info:eu-repo/semantics/acceptedVersionPalabras clave / Materias
Resumen
Climate change evolution urges us to take action to reduce greenhouse gas emissions. As one of the main contributors, the industrial sector requires cleaner methods of heat production, such as high temperature heat ... [+]
Climate change evolution urges us to take action to reduce greenhouse gas emissions. As one of the main contributors, the industrial sector requires cleaner methods of heat production, such as high temperature heat pumps (HTHP) with the highest energy efficiency. Facing this challenge, this paper provides a per- formance comparison of the ejector and economizer with parallel compression configurations in HTHPs for low-grade waste heat recovery. A single-stage cycle has been used as a reference configuration to compare the proposed options. The internal heat exchanger (IHX) is included in all the configurations to extend the analysis and illustrate the influence of this component in high temperature applications. Moreover, alternative low-GWP refrigerants have been analyzed in order to replace the reference work- ing fluid HFC-245fa. Ejector and economizer with parallel compression configurations with IHX provide a coefficient of performance (COP) improvement of up to 36% and 72.5%, respectively, using HFC-245fa for a heating temperature production of 140 °C. Moreover, the volumetric heating capacity (VHC) increases around 36% for the ejector cycle and 80% for the economizer with parallel compression cycle with IHX. HC-601, HFO-1336mzz(Z), and R-514 have the most significant COP improvement compared to HFC-245fa, along with the highest VHC drop. Multi-objective evaluation illustrates that single-stage and ejector con- figurations with IHX have similar results, whereas the economizer with parallel compression cycle with IHX presents a significant COP and VHC improvement. HCFO-1233zd(E) and HCFO-1224yd(Z) presents the proper trade-off between COP and VHC. [-]
Publicado en
International Journal of Refrigeration Volume 119, November 2020, Pages 356-365Proyecto de investigación
RTC-2017-6511-3, UJI-B2018-24, PREDOC/2017/41Derechos de acceso
© 2020 Elsevier Ltd and IIR. All rights reserved.
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
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