| Title |
Performance of Heat Pumps Charged with R170/R290 Mixture |
| Authors |
박기정(Ki-Jung Park) ; 이철희(Cheol-Hee Lee) ; 정동수(Dongsoo Jung) |
| Keywords |
대체냉매 ; 성능계수 ; 냉동용량 ; 프로판 ; 에탄 ; 혼합냉매 ; 히트펌프 Alternative refrigerant ; COP ; Capacity ; R290 ; R170 ; Refrigerant mixture ; Heat pump |
| Abstract |
In this study, performance of R170/R290 mixtures is measured on a heat pump bench tester in an attempt to substitute R22. The bench tester is equipped with a commercial hermetic rotary compressor providing a nominal capacity of 3.5 kW. All tests are conducted under the summer cooling and winter heating conditions of 7/45 ℃ and -7/41 ℃ in the evaporator and condenser respectively. During the tests, the composition of R170 is varied from 0 to 10% with an interval of 2%. Test results show that the coefficient of performance (COP) and capacity of R290 are up to 15.4% higher and 7.5% lower than those of R22 for both conditions respectively. For R170/R290 mixture, the COP decreases and the capacity increases with an increase in the amount of R170. The mixture of 4%R170/96%R290 shows the similar capacity and COP as those of R22. For the mixture, the compressor discharge temperature is 16～30 ℃ lower than that of R22. There is no problem with mineral oil since the mixture is mainly composed of hydrocarbons. The amount of charge is reduced up to 58% as compared to R22. Overall, R170/R290 mixture is a good long term ‘drop-in’ candidate to replace R22 in residential air-conditioners and heat pumps. |