Abstract
A numerical simulation of an air-conditioning system using R134a instead of R22 was carried out. The numerical model of air-conditioning system consists of constant rotational speed compressor, condenser, evaporator, and capillary tube. The model geometry was determined from actual air-conditioner designed for R22. With this model, operating cycle with R22 and R134a were calculated and the performances were compared. When operating with R134a, calculation result indicates approximately 84 percent heat exchange and even higher COP in comparison with the case of R22. Performance prediction of refrigerant substitution for various designs of air-conditioning systems will be possible with this model.
