| Title |
Experimental Study on the Cooling Performance of a Variable Speed CO2 Cycle with Internal Heat Exchanger and Electronic Expansion Valve |
| Keywords |
Carbon dioxide ; 이산화탄소 ; Transcritical cycle ; 초월임계 사이클 ; Internal heat exchanger ; IHX, 내부열교환기 ; Electronic expansion valve ; EEV, 전자팽창밸브 |
| Abstract |
Since a transcritical CO2 cycle shows lower performance than conventional air conditioners in the cooling mode operation, it is required to enhance the performance of the CO2 cycle by applying advanced technologies and optimizing components. In this study, the cooling performance of a CO2 system measured by varying refrigerant charge amount, compressor frequency, EEV opening and length of internal heat exchanger. As a result, the cooling COP of the basic system without internal heat exchanger was 2.1. The cooling performance of the modified cycle applying internal heat exchanger improved by 4-9% over the basic cycle. |