| Title |
Simulation Study on the Performance Characteristics of a CO2 Cooling System with an Expander |
| Authors |
조홍현(Honghyun Cho) ; 백창현(Changhyun Baek) ; 류창기(Changgi Ryu) ; 김용찬(Yongchan Kim) |
| Keywords |
이산화탄소 ; 과도임계 사이클 ; 팽창기 ; 상분리 사이클 ; 팽창기 효율 Carbon dioxide ; Transcritical cycle ; Expander ; Phase-separate cycle ; Expander efficiency |
| Abstract |
A CO2 cycle shows large throttling loss during the expansion process. The application of an expander into the CO2 cycle can reduce the throttling loss and then improve system performance. In this study, the performance of a transcritical CO2 cycle with an expander was analytically investigated in order to improve the cooling performance of the system. The expander was applied to the single-stage and two-stage compression cycles. The performance was analyzed with the variations of compressor frequency, outdoor temperature, and expander efficiency. The single-stage and two-stage compression cycles with the expander showed COP improvement of 25% and 32%, respectively, over the single-stage cycle with an EEV. |