Abstract: A model was developed for micro-channel gas coolers in trans-critical carbon dioxide refrigeration systems.Fluid flow and heat transfer processes in both refrigerant and air sides were analyzed with the latest physical properties database and the corresponding correlations. The model was validated by the comparison between simulation results and experimental data under various conditions.Furthermore, the influences of major parameters on gas cooler performance were analyzed and discussed.The results indicated that the exit enthalpy of gas cooler could be reduced by increasing refrigerant pressure, increasing pass number or decreasing port diameter, but with the side effects of greater input power or pressure drop.So the above parameters should be considered comprehensively in the optimal design of gas cooler.The model developed in this paper could be used for the optimal design of gas coolers.

摘要： 建立了跨临界CO₂制冷系统中微通道气体冷却器模型，对管内CO₂和空气侧的流动和换热进行了数值仿真.比较了多种工况下的仿真结果与实验数据，验证了该模型正确性;并运用该模型分析了各种参数下的气体冷却器的性能，可用于指导优化设计.