가스인젝션을 적용한 이산화탄소 열펌프의 난방성능 향상에 관한 해석적 연구

Abstract

In this study, a simulation model for a CO2 heat pump using vapor injection was developed and validated. It was used to predict the improvement of the heating performance of the CO2 heat pump at various operating conditions. The simulation results showed consistent results with the measured data. The heating performances of the vapor injection and non-injection heat pumps were compared by varying the outdoor temperature and compressor frequency. The heating capacity of the vapor injection heat pump was 40% higher than that of the non-injection heat pump at the outdoor temperature of -8℃. The performance of the vapor injection heat pump was consistently higher than that of the non-injection heat pump even when the compressor frequency was reduced to 35 Hz at the outdoor temperature of -3℃.