| Title |
Performance Characteristics of a CO2 Cooling and Water Heating System with a Twin-rotary Compressor |
| Authors |
조홍현(Honghyun Cho) ; 이호성(Hosung Lee) ; 백창현(Changhyun Baek) ; 김용찬(Yongchan Kim) ; 조성욱(Sungwook Cho) |
| Keywords |
초월임계 이산화탄소 사이클 ; 급탕 시스템 ; 트윈로터리 압축기 ; 압축체적비 Transcritical CO2 cycle ; Water heating system ; Twin-rotary compressor ; Compression volume ratio |
| Abstract |
The objective of this paper is to investigate the performance characteristics of a CO2 cooling and water heating system using a twin-rotary compressor with the compression volume ratio of 0.6. The cooling performances of the CO2 heat pump were measured and analyzed with the variations of charge amount, EEV opening, and compressor frequency. In addition, the performance of the combined system including cooling and water heating was also measured and analyzed by varying inlet temperature of the EEV. As a result, the optimal normalized charge and cooling COP in the cooling mode were 0.307 and 2.06, respectively. The application of the water heating into the CO2 heat pump improved the cooling performance over 78% and decreased the EEV inlet temperature by 8℃, which can increase system reliability. |