| Title |
Performance of R502 Alternative Refrigerants for Low Temperature Applications |
| Keywords |
R502 ; 냉매502 ; Alternative refrigerant ; 대체냉매 ; COP ; 성능계수 ; Capacity ; 냉동용량 ; Discharge temperature ; 압축기 토출온도 |
| Abstract |
In this study, 2 pure hydrocarbon refrigerants of R1270(Propylene) and R290 (Propane) and 3 binary mixtures composed of R1270, R290 and R152a were tested in a refrigerating bench tester with a scroll compressor in an attempt to substitute R502 used in most of the low temperature applications. The test bench provided 3∼3.5kW capacity and water and water/glycol mixture were employed as the secondary heat transfer fluids. All tests were conducted under the same external conditions resulting in the average saturation temperatures of －28 and 45℃ in the evaporator and condenser, respectively. Test results showed that all refrigerants tested had 9.6∼18.7% higher capacity and 17.1∼27.3% higher COP than R502. The compressor discharge temperature of R1270 was similar to that of R502 while those of all other refrigerants were 23.7∼27.9℃ lower than that of R502. For all alternative refrigerants, the amount of charge was reduced up to 60% as compared to R502. Overall, these alternative refrigerants offer better system performance and reliability than R502 and can be used as long term substitutes for R502 due to their excellent environmental properties. |