| Title |
Performance of HFC152a, HFC134a and HC290 Mixtures as Alternative Refrigerants for HFC134a |
| Authors |
강남구(Namkoo Kang) ; 배근환(Guenhwan Bae) ; 박기정(Ki-Jung Park) ; 정동수(Dongsoo Jung) |
| Keywords |
대체냉매 ; 자동차 공기조화기 ; 성능계수 ; 냉동용량 ; 냉매 152a ; 프로판 Alternative refrigerant ; Automobile air conditioner ; COP ; Capacity ; HFC152a ; HC290 ; |
| Abstract |
In this study, HFC152a, HFC134a/HFC152a and HC290/HFC134a/HFC152a mixtures are studied for the supplementary and alternative refrigerants for HFC134a used in automobile air-conditioners. Due to the high global warming potential of HFC134a, it has to be phased out in the long run. Thermodynamic performance of these refrigerants are measured in a bench tester of 3.5 kW capacity with an open type compressor under both summer and winter conditions. Test results show that the coefficient of performance (COP) and capacity of pure HFC152a and HFC134a/ HFC152a mixture are 9.1～12% and 7% higher than those of HFC134a. As for the HC290/HFC134a/ HFC152a, the COP is up to 9.5% higher than that of HFC134a with 1～2% of HC290 while that is up to 6.1% lower than that of HFC134a with 5% HC290. The capacity of the ternary mixture, however, is 8.6% higher than that of HFC134a at all compositions tested. The compressor discharge temperatures of all refrigerants tested are 6～10℃ higher than that of HFC134a. For all refrigerants, the amount of charge is reduced up to 32% due to the decrease in liquid density. Overall, these refrigerants provide good performance with reasonable energy savings with less environmental problem and thus can be used as long term alternatives for automobile air-conditioners. |