| Title |
The Cooling Performance Enhancement of a Variable Speed Heat Pump Using Gas Injection Technique |
| Authors |
정민우(Min Woo Jeong) ; 허재혁(Jaehyeok Heo) ; 정해원(Hae Won Jung) ; 김용찬(Yongchan Kim) |
| Keywords |
가스인젝션 ; 냉방성능 ; 2단 사이클 ; 기액분리기 Gas injection ; Cooling performance ; Two-stage cycle ; Gas/liquid separator |
| Abstract |
In this study, the improvement of cooling capacity by applying gas injection technique in a two-stage heat pump using R410A was experimentally investigated. A twin rotary type compressor with gas injection was applied to the heat pump system. The optimum refrigerant charge for the injection and the non-injection cycles was selected to achieve the maximum COP at the cooling standard condition. The injection cycle showed less optimum refrigerant charge than that of the non-injection cycle. The cooling performances of the injection and the non-injection cycles were measured and compared by varying compressor frequency from 40 to 90 Hz. The cooling capacity of the gas injection cycle was 1.6%～11.3% higher than that of the non-injection cycle. The COP of the gas injection cycle was 13.7% to 28.9% higher than that of the non-injection cycle at the same cooling capacity. The heat pump system showed stable operation after 30% of the injection valve opening. |