| Title |
Performance Experiment and Exergy Analysis of an Automotive Air-conditioning System |
| Keywords |
Exergy ; 엑서지 ; Exergy efficiency ; 엑서지 효율 ; Refrigerant mixture ; 혼합냉매 ; COP ; 성능계수 ; Subcooling ; 과냉도 ; Superheating ; 과열도 |
| Abstract |
Experiments have been performed, using pure refrigerant R134a and a zeotropic refrigerant mixture R290/R600a(60%/40%) and their performances have been analyzed by the first and second laws(exergy method) of thermodynamics. From the experimental results, variations of compressor speed and air temperature have a great effect on the performance of the system. The sum of exergy losses in compressor and evaporator is about 60% of total exergy loss, using refrigerant R134a, so it is necessary to improve the performance of compressor and evaporator. According to the experimental results using refrigerant mixture of R290/R600a(60%/40%), the exergy losses in heat exchange processes are decreased but the exergy loss in throttling process is increased. The performance of the system has been improved by 20∼30% compared with that of R134a and exergy losses have been also reduced. |