R134a-Fe3O4纳米制冷剂汽车空调冷凝器传热数值模拟

Numerical Simulation of Heat Transfer in Automotive Air Conditioning Heat Pump Condenser with R134a-Fe3O4 Nanorefrigerant

为提高汽车空调系统的换热系数,降低能耗,结合格子Boltzmann方法和CFD仿真计算,从介观和宏观两个角度对R134a-Fe3O4纳米制冷剂在电动汽车空调冷凝器中应用效果进行研究。从两种数值计算结果均发现,相比于纯制冷剂,R134a-Fe3O4纳米制冷剂应用在汽车空调冷凝器中,换热量有大幅提高;且液态纳米制冷剂换热量高于气态纳米制冷剂,换热量随纳米颗粒浓度的增加而增加。

In order to improve the heat transfer coefficient of automobile air conditioning system and reduce energy consumption, combined with lattice Boltzmann method and CFD simulation calculation, the application effect of R134a-Fe3O4 nano-refrigerants in electric vehicle air conditioning condenser was studied from mesoscopic and macroscopic point of view. From the two numerical results, it is found that compared with the pure refrigerants, the heat transfer of R134a-Fe3O4 nano-refrigerants used in automobile air-conditioning condensers is greatly improved. The heat transfer of liquid nano-refrigerants is higher than that of gaseous nano-refrigerants, and the heat transfer increases with the increase of nano-particle concentration.