| Title |
Influence of Charging Amounts on the Cooling Performance of CO2/Propane Mixtures and Concentration Shift Behavior |
| Keywords |
Carbondioxide ; 이산화탄소 ; Propane ; 프로판 ; Zeotropicmixture ; 변온증발혼합물 ; Chargingamount ; 충전량 ; Concentrationshift ; 성분비변화 |
| Abstract |
CO2 and propane mixtures, which are environmentally benign, nontoxic, low in price, and compatible with materials and lubricants, were considered as promising alternative refrigerants. A fully instrumented air-conditioning system was developed for a precise performance evaluation of pure CO2 and CO2/propane mixtures. In this paper, the effect of the charging amount and circulation concentration on the cooling performance of the system using CO2 and propane mixtures was tested and discussed. 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. An optimum charging amount was proposed as a parameter instead of the degree of subcooling, which can not be well defined in the transcritical cycle, to properly compare the performance between the transcritical and subcritical cycles. |