Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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The Cooling Performance Enhancement of a Variable Speed Heat Pump Using Gas Injection Technique

가스인젝션 기술을 적용한 공기열원 가변속 열펌프의 냉방성능 향상에 관한 연구

  • Jeong, Min-Woo (Department of Mechanical Engineering, Korea University) ;
  • Heo, Jae-Hhyeok (Department of Mechanical Engineering, Korea University) ;
  • Jung, Hae-Won (Department of Mechanical Engineering, Korea University) ;
  • Kim, Yong-Chan (Graduate School of Mechanical Engineering, Korea University)
  • Published : 2009.08.10
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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.

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References

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