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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Theoretical Evaluation of the Effect of Refrigerant Charge on the Performance of Vapor-Compression Air-Conditioning System

증기압축식 에어컨의 냉매 충전량에 따른 성능 예측

  • 이경중 (한국한양대학교 냉동공조공학과) ;
  • 방광현 (한국한양대학교 냉동공조공학과)
  • Published : 2000.05.01
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Abstract

A theoretical model for the transient performance of vapor-compression air-conditioning system has been developed to evaluate the influence of the refrigerant charge on the system performance. A set of mass and energy equations for the simulation of the heat exchangers and the capillary tube and a polytropic compression model for the compressor are used. The present model successfully predicts the transient behavior of the vapor-compression air-conditioner from the startup. As the refrigerant charge is increased, both the evaporating and condensing pressures increase gradually, and the cooling rate and the COP show a maximum in the range of 0.75-0.8 kg of refrigerant charge. This amount of refrigerant mass is determined to be the optimum charge of the model system. Also, the effect of outdoor air temperature on the optimum refrigerant charge is discussed.

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References

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