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Thermodynamic Analysis of Transcritical CO(2) Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling

The new configuration of a transcritical CO(2) ejector expansion refrigeration cycle combined with a dedicated mechanical subcooling cycle (EMS) is proposed. Three mass ratios of R32/R1234ze(Z) (0.4/0.6, 0.6/0.4, and 0.8/0.2) were selected as the refrigerants of the mechanical subcooling cycle (MS)...

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Autores principales: Fu, Ruansong, Wang, Jinhui, Zheng, Minfeng, Yu, Kaihong, Liu, Xi, Li, Xuelai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7515403/
http://dx.doi.org/10.3390/e21090874
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author Fu, Ruansong
Wang, Jinhui
Zheng, Minfeng
Yu, Kaihong
Liu, Xi
Li, Xuelai
author_facet Fu, Ruansong
Wang, Jinhui
Zheng, Minfeng
Yu, Kaihong
Liu, Xi
Li, Xuelai
author_sort Fu, Ruansong
collection PubMed
description The new configuration of a transcritical CO(2) ejector expansion refrigeration cycle combined with a dedicated mechanical subcooling cycle (EMS) is proposed. Three mass ratios of R32/R1234ze(Z) (0.4/0.6, 0.6/0.4, and 0.8/0.2) were selected as the refrigerants of the mechanical subcooling cycle (MS) to further explore the possibility of improving the EMS cycle’s performance. The thermodynamic performances of the new cycle were evaluated using energetic and exergetic methods and compared with those of the transcritical CO(2) ejector expansion cycle integrated with a thermoelectric subcooling system (ETS). The results showed that the proposed cycle presents significant advantages over the ETS cycle in terms of the ejector performance and the system energetic and exergetic performances. Taking the EMS cycle using R32/R1234ze(Z) (0.6/0.4) as the MS refrigerant as an example, the improvements in the coefficient of performance and system exergy efficiency were able to reach up to 10.27% and 15.56%, respectively, at an environmental temperature of 35 °C and evaporation temperature of −5 °C. Additionally, the advantages of the EMS cycle were more pronounced at higher environmental temperatures.
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spelling pubmed-75154032020-11-09 Thermodynamic Analysis of Transcritical CO(2) Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling Fu, Ruansong Wang, Jinhui Zheng, Minfeng Yu, Kaihong Liu, Xi Li, Xuelai Entropy (Basel) Article The new configuration of a transcritical CO(2) ejector expansion refrigeration cycle combined with a dedicated mechanical subcooling cycle (EMS) is proposed. Three mass ratios of R32/R1234ze(Z) (0.4/0.6, 0.6/0.4, and 0.8/0.2) were selected as the refrigerants of the mechanical subcooling cycle (MS) to further explore the possibility of improving the EMS cycle’s performance. The thermodynamic performances of the new cycle were evaluated using energetic and exergetic methods and compared with those of the transcritical CO(2) ejector expansion cycle integrated with a thermoelectric subcooling system (ETS). The results showed that the proposed cycle presents significant advantages over the ETS cycle in terms of the ejector performance and the system energetic and exergetic performances. Taking the EMS cycle using R32/R1234ze(Z) (0.6/0.4) as the MS refrigerant as an example, the improvements in the coefficient of performance and system exergy efficiency were able to reach up to 10.27% and 15.56%, respectively, at an environmental temperature of 35 °C and evaporation temperature of −5 °C. Additionally, the advantages of the EMS cycle were more pronounced at higher environmental temperatures. MDPI 2019-09-08 /pmc/articles/PMC7515403/ http://dx.doi.org/10.3390/e21090874 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Fu, Ruansong
Wang, Jinhui
Zheng, Minfeng
Yu, Kaihong
Liu, Xi
Li, Xuelai
Thermodynamic Analysis of Transcritical CO(2) Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling
title Thermodynamic Analysis of Transcritical CO(2) Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling
title_full Thermodynamic Analysis of Transcritical CO(2) Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling
title_fullStr Thermodynamic Analysis of Transcritical CO(2) Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling
title_full_unstemmed Thermodynamic Analysis of Transcritical CO(2) Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling
title_short Thermodynamic Analysis of Transcritical CO(2) Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling
title_sort thermodynamic analysis of transcritical co(2) ejector expansion refrigeration cycle with dedicated mechanical subcooling
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7515403/
http://dx.doi.org/10.3390/e21090874
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