| Title |
Cooling Performance of Several CO2/Propane Mixturesin an Air-Conditioning System |
| Keywords |
Carbon dioxide ; 이산화탄소 ; Propane ; 프로판 ; Zeotropic mixture ; 변온증발혼합물 ; Degree of superheat ; 과열도 ; Temperature gliding effect ; 온도변화효과 |
| Abstract |
CO2 and propane mixtures were chosen as promising alternative refrigerants and their performance potentials were evaluated experimentally in an air-conditioning system. Pure CO2 and 85/15, 75/25 and 60/40 binary blends by the charged mass percentage of CO2/ propane were selected as working fluids. The effect of the inlet temperature of the secondary fluids and degree of superheat on the cooling performance was tested and discussed. The charging amounts of refrigerants were adjusted to make the system show the maximum COP. Comparisons among different refrigerants were carried out on the same compressor speed basis for a given operating condition. In addition, the temperature gliding effect of zeotropic mixtures on the system performance were analyzed based on the drop-in test results. |