{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T21:22:00Z","timestamp":1792790520759,"version":"4.5.0"},"reference-count":38,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2019,12,19]],"date-time":"2019-12-19T00:00:00Z","timestamp":1576713600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>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 \u00b0C to 37.5 \u00b0C, 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.<\/jats:p>","DOI":"10.3390\/e22010004","type":"journal-article","created":{"date-parts":[[2019,12,20]],"date-time":"2019-12-20T09:50:33Z","timestamp":1576835433000},"page":"4","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Performance Characteristics of Automobile Air Conditioning Using the R134a\/R1234yf Mixture"],"prefix":"10.3390","volume":"22","author":[{"given":"Yunchan","family":"Shin","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, Graduate School of Chosun University, Gwangju 61452, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Taejung","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Automobile, Yeongju Campus of Korea Polytechnics VI, Yeongju 36142, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Areum","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Graduate School of Chosun University, Gwangju 61452, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Honghyun","family":"Cho","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Chosun University, Gwangju 61452, Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2019,12,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"743","DOI":"10.3795\/KSME-B.2011.35.7.743","article-title":"Performance evaluation of HFO-1234yf as a substitute for R-134a in a Household Freezer\/Refrigerator","volume":"35","author":"Lee","year":"2011","journal-title":"Korean Soc. 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