| Title |
Simulation Study on the Performance Improvement ofa CO² System Applying a Two-stage Phase-separate Cycle |
| Authors |
류창기 ; 이호성 ; 김용찬 ; 조홍현 ; 조성욱 |
| Keywords |
Carbon dioxide ; 이산화탄소 ; Transcritical cycle ; 과도임계 사이클 ; Two-stage compression cycle ; 2단압축 사이클 ; Phase-separate cycle ; 상분리 사이클 |
| Abstract |
In this study, a two-stage phase-separate cycle was investigated analytically to improve the performance of the CO² system in the cooling mode. The simulation results were verified with the measured data. The predictions using the simulation model were consistent with the measured data within ±20% deviations. The performance of the modified CO² system with the two-stage phase-separated cycle was analyzed with the variations of outdoor temperature and EEV opening. The cooling COP decreased with the increase of compressor frequency. The highest COP was 2.7 at compressor frequencies of 30Hz and 30Hz for the first and second compressors, respectively. In addition, the cooling COP increased by 9.3% with an application of optimum control of the first and second-stage EEV openings. |