| Title |
Performance of R290 and R1270 as Alternative Refrigerants of R22 According to Temperature Variations of Evaporator and Condenser |
| Keywords |
Alternative refrigerant ; 대체냉매 ; COP ; 성능계수 ; Evaporator ; 증발기 ; Condenser ; 응축기 ; Heat pump ; 열펌프 ; Air-conditioning ; 공조기 ; Discharge temperature ; 압축기 토출온도 |
| Abstract |
In this study, performance of 2 pure hydrocarbons R290 and R1270 was measured in an attempt to substitute R22 under 3 different temperature conditions. They were tested in a refrigerating bench tester with a hermetic rotary compressor. The test bench provided about 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 7/45℃ and －7/41℃ and －21/28℃ in the evaporator and condenser, respectively. Test results show that the coefficient of performance (COP) of these refrigerants is up to 11.54% higher than that of R22 in all temperature conditions. Compressor discharge temperatures were reduced by 14∼31℃ with these fluids. There was no problem with mineral oil since the mixtures were mainly composed of hydrocarbons. The amount of charge was reduced up to 58% as compared to R22. Overall, these fluids provide good performance with reasonable energy savings without any environmental problem and thus can be used as long term alternatives for residential air-conditioning and heat pumping application. |