| Title |
Performance of R1234yf and R1234yf/R134a Mixture under Mobile Air-conditioner Operating Conditions |
| Authors |
박기정(Ki-Jung Park) ; 이요한(Yohan Lee) ; 최대성(Daeseong Choe) ; 정동수(Dongsoo Jung) |
| Keywords |
대체냉매 ; 성능계수 ; 냉동용량 ; 냉매1234yf ; 혼합냉매 ; 히트펌프 Alternative refrigerant ; COP ; Capacity ; R1234yf ; Refrigerant mixture ; Heat pump ; |
| Abstract |
In this study, performance of R1234yf and R1234yf/R134a mixture is measured on a heat pump bench tester in an attempt to substitute R134a used widely in mobile air conditioners (MACs). The bench tester is equipped with a open type compressor providing a nominal capacity of 3.5 kW. All tests are conducted under the summer cooling and winter heating conditions of 7/4 5℃ and -7/41℃ in the evaporator and condenser, respectively. For R1234yf/R134a mixture, measurements are made at 5%, 10%, and 15% of R134a by mass. Test results show that the coefficient of performance (COP) and capacity of R1234yf are up to 2.7% and 4.0% lower than those of R134a, respectively. For R1234yf/R134a mixture, the COP and capacity are up to 3.9% lower and 3.6% higher than those of R134a. For R1234yf and R1234yf/R134a mixture, the compressor discharge temperature is 4.1～6.7℃ lower than that of R134a while the amount of charge is reduced up to 11% as compared to R134a. 90%R1234yf/10%R134a is a better refrigerant than pure R1234yf in that it is less flammable and more compatible with existing R134a system. Based upon the results, it is concluded that R1234yf and R1234yf/R134a mixture are long term environmentally friendly solutions to mobile air-conditioners due to their excellent environmental properties with acceptable performance. |