대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제31권8호
  • /
  • Pages.694-701
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  • 2007
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  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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가변속 이산화탄소 열펌프의 난방성능 특성에 관한 실험적 연구

Experimental Study on the Heating Performance of a Variable Speed CO2 Heat Pump with a Variation of Operating Conditions

  • 조홍현 (고려대학교 기계공학과) ;
  • 이호성 (고려대학교 기계공학과 대학원) ;
  • 장용희 (고려대학교 기계공학과 대학원) ;
  • 김용찬 (고려대학교 기계공학과)
  • 발행 : 2007.08.01
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초록

The applications of a transcritical $CO_2$ cycle into water heaters show advantages over conventional systems in the respect of power consumption and heating efficiency because the $CO_2$ cycle has a high compressor discharge temperature. Besides, the heating performance of the transcritical $CO_2$ cycle can be improved by optimizing operating conditions. In this study, the heating performance of a variable speed $CO_2$ heat pump was measured and analyzed by varying refrigerant charge amount, EEV opening, compressor frequency and outdoor temperature. As a result, the optimum normalized charge for heating was 0.226. The COPs at the compressor frequencies of 40, 50 and 60 Hz were 2.94, 2.75 and 2.25, respectively. The heating performance of the $CO_2$ cycle with charge amount was more sensitive than the cooling performance. Moreover, the heating performance was improved significantly by optimizing of compressor frequency and EEV opening.

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참고문헌

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