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Performance Characteristics of Automobile Air Conditioning Using the R134a/R1234yf Mixture

In this study, the energy and exergy of an automobile refrigeration system using R134a and R134a/R1234yf were analyzed experimentally with respect to outdoor air temperature and compressor speed. As outdoor air temperature increased from 32.5 °C to 37.5 °C, the coefficient of performance (COP) and t...

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Autores principales: Shin, Yunchan, Kim, Taejung, Lee, Areum, Cho, Honghyun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7516462/
https://www.ncbi.nlm.nih.gov/pubmed/33285779
http://dx.doi.org/10.3390/e22010004
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author Shin, Yunchan
Kim, Taejung
Lee, Areum
Cho, Honghyun
author_facet Shin, Yunchan
Kim, Taejung
Lee, Areum
Cho, Honghyun
author_sort Shin, Yunchan
collection PubMed
description In this study, the energy and exergy of an automobile refrigeration system using R134a and R134a/R1234yf were analyzed experimentally with respect to outdoor air temperature and compressor speed. As outdoor air temperature increased from 32.5 °C to 37.5 °C, the coefficient of performance (COP) and total exergy destruction rate of the refrigeration system using Mix30 decreased by 5.19% and 25.8% on average, compared to that of the system using R134a. The exergy efficiency of the Mix30 refrigeration system was on average 21.8% higher than that of the R134a system. As the compressor rotating speed increased from 1000 to 2000 rpm, the cooling capacity of the refrigeration system using R134a and R134a/R1234yf increased, while the COP decreased. The COP and total exergy destruction rate of the refrigeration system using Mix30 decreased by 4.82% and 19.5%, compared to that of the system using R134a. The exergy efficiency of the Mix30 refrigeration system increased on average by 20.7%, compared to that of the R134a system. The total exergy destruction rate of the automobile refrigeration system using R134a/R1234yf decreased with increase in R1234yf, while exergy efficiency increased. In addition, the exergy destruction rate of the automobile refrigeration system decreased as the amount of R1234yf in the R134a/R1234yf automobile refrigeration system increased.
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spelling pubmed-75164622020-11-09 Performance Characteristics of Automobile Air Conditioning Using the R134a/R1234yf Mixture Shin, Yunchan Kim, Taejung Lee, Areum Cho, Honghyun Entropy (Basel) Article In this study, the energy and exergy of an automobile refrigeration system using R134a and R134a/R1234yf were analyzed experimentally with respect to outdoor air temperature and compressor speed. As outdoor air temperature increased from 32.5 °C to 37.5 °C, the coefficient of performance (COP) and total exergy destruction rate of the refrigeration system using Mix30 decreased by 5.19% and 25.8% on average, compared to that of the system using R134a. The exergy efficiency of the Mix30 refrigeration system was on average 21.8% higher than that of the R134a system. As the compressor rotating speed increased from 1000 to 2000 rpm, the cooling capacity of the refrigeration system using R134a and R134a/R1234yf increased, while the COP decreased. The COP and total exergy destruction rate of the refrigeration system using Mix30 decreased by 4.82% and 19.5%, compared to that of the system using R134a. The exergy efficiency of the Mix30 refrigeration system increased on average by 20.7%, compared to that of the R134a system. The total exergy destruction rate of the automobile refrigeration system using R134a/R1234yf decreased with increase in R1234yf, while exergy efficiency increased. In addition, the exergy destruction rate of the automobile refrigeration system decreased as the amount of R1234yf in the R134a/R1234yf automobile refrigeration system increased. MDPI 2019-12-19 /pmc/articles/PMC7516462/ /pubmed/33285779 http://dx.doi.org/10.3390/e22010004 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
Shin, Yunchan
Kim, Taejung
Lee, Areum
Cho, Honghyun
Performance Characteristics of Automobile Air Conditioning Using the R134a/R1234yf Mixture
title Performance Characteristics of Automobile Air Conditioning Using the R134a/R1234yf Mixture
title_full Performance Characteristics of Automobile Air Conditioning Using the R134a/R1234yf Mixture
title_fullStr Performance Characteristics of Automobile Air Conditioning Using the R134a/R1234yf Mixture
title_full_unstemmed Performance Characteristics of Automobile Air Conditioning Using the R134a/R1234yf Mixture
title_short Performance Characteristics of Automobile Air Conditioning Using the R134a/R1234yf Mixture
title_sort performance characteristics of automobile air conditioning using the r134a/r1234yf mixture
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7516462/
https://www.ncbi.nlm.nih.gov/pubmed/33285779
http://dx.doi.org/10.3390/e22010004
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