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The low temperature distribution of the refrigerated and frozen food has been increased gradually. Refrigeration industry is using R134a refrigerant, which GWP is 1300. R1234yf is an alternative refrigerant of R134abecause GWP of R1234yf refrigerant is just 4. Evaporator used in refrigeration truck refrigeration system is operatedon low temperature condition. Accordingly, evaporator is formed frost and the formation of frost is rapidly decreasedperformance of evaporator. In this study, the performance of evaporator using R134a and R1234yf refrigerant was analyzed with operating conditions under frost condition. As a result, the performance of R134a evaporator accordingto air inlet temperature, relative humidity and evaporating temperature was more sensitive than R1234yf evaporator.Besides, the frost growth of R134a evaporator is steeper than that of R1234yf one. Keywords : Evaporator, Frost thickness, Refrigeration capacity ratio, R134a, R1234yf * Corresponding Author : Honghyun Cho(Chosun Univ.)Tel: +82-62-230-7769 email: hhcho@chosun.ac.krReceived June 3, 2015Accepted September 11, 2015Revised August 31, 2015Published September 30, 2015

Performance Comparison of Fin-Tube Type Evaporator using R134a and R1234yf under the Frost Condition