823 설비학논문집 제 24 권 제 12 호(2012)/pp. 823-829 Korean J. Air-Conditioning and Ref. Eng. 2012. 12.: 24(12) http://dx.doi.org/10.6110/KJACR.2012.24.12.823 냉매 R1234yf 적용 자동차용 에어컨 Drop-in 성능 특성 조 홍 현, 이 호 성 * , 박 차 식 **† 조선대학교 기학, * 한국자동차부품연구원, ** 호서대학교 기학부 Performance Characteristics of a Drop-in System for a Mobile Air Conditioner Using Refrigerant R1234yf Honghyun Cho, Hoseong Lee * , Chasik Park **† Department of Mechanical Engineering, Chosun University, Kwangju 510-759, Korea * Division of the Thermal Management System Research Center, KATECH, Cheonan 330-912, Korea ** School of Mechanical Engineering, Hoseo University, Asan 336-795, Korea (Received July 4, 2012; revision received October 17, 2012) ABSTRACT: In this study, the performance of mobile air conditioner(MAC) systems to which the refrigerants R134a and R1234yf were used was evaluated to compare the characteristic of automotive refrigeration cycles with refrigerant. The experimental setup of a MAC consists of an belt driven compressor, a condenser, an evaporator and a block type thermal expansion valve. The drop-in test on MAC were carried out under variable compressor speed from 800 to 2500 rpm. Performance test by using R1234yf and R134a in the same system revealed low the charge amount and mass flow rates for using R1234yf, that is, up to 10% and 17%, respectively. The compressor discharge temperature of R1234yf is 8℃ lower than that of R134a. The cooling capacity with R1234yf system decreased by 4～7% compared with R134a system. In addition, The COP of R1234yf system is lower 3～4% than that of R134a system. Key words: Alternative refrigerant(대체냉매), R1234yf(R1234yf), GWP(지구온난화지수), Mass flow rate(질량유량), COP(성능수) †Corresponding author Tel.: +82-41-540-5815; fax: +82-41-540-5818 E-mail address: cspark@hoseo.edu 기 호 설 명 COP ：성적수 h ：엔탈피 [kJ/kg] Q ：냉방용량 [kW]   ：풍량 [m 3 /h] W ：압축기 소요동력 [kW] 그리스 문자  ：비체적 [m 3 /kg] 하첨자 air ：기 comp ：압축기 e ：증발기 in ：입구 out ：출구 1. 서 론 온실가스에 의한 지구온난화 문제에 동으로 대 처하기 위하여 전 세적으로 환규제를 하는 국 제협약이 이루어지 있으며, 그 중의 하나가 교토