Numerical Simulation on Heat Transfer Phenomena in Microchannel Evaporator of A CO2 Air Conditioning System

摘要

The investigation presented a numerical simulation on heat transfer behaviors in microchannel evaporator of a CO 2 air conditioning system. The conditions for numerical simulation were applied by the experimental data of a CO 2 air conditioning cycle. This cycle worked with the cooler pressure of 85 bar, evaporator pressure of 37 bar, and the CO 2 flow rate of 5.2 g/s. The temperature and pressure in microchannels are uniform; they are suitable with the theory of evaporating process. The numerical results are in good agreement with those obtained from experimental data at the same condition. In addition, the vapor quality increases from 0.50 to 0.52 when the CO 2 refrigerant enters the evaporator at position of 200mm . These results are in good agreement with experimental data.