| Title |
A Theoretical Evaluation of the Effect of Refrigerant Charge on the Performance of Vapor-Compression Air-Conditioning System |
| Keywords |
Air-Conditioner ; 에어컨 ; Refrigerant charge ; 냉매 충전량 ; Transientsimulation ; 과도상태 시뮬레이션 |
| Abstract |
A theoretical model for the transient performance ofvapor-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. |