Abstract: In this paper, the computational fluid dynamics (CFD) analysis method is used to analyze the defrosting performance of a mini-car air conditioner in the design and development stage. The structure of the defrosting duct of the air conditioner is optimized through the steady-state CFD analysis results, and the three-dimensional/one-dimensional coupling simulation is used to conduct the transient analysis of the defrosting of the windshield glass surface under different air conditioner positive temperature coefficient (PTC) configurations, which provides an effective reference for the flow field performance optimization and PTC parameter selection of the air conditioner in the design stage. The results show that the optimized air duct combined with 2.5 kW PTC can meet the requirements of defrosting performance. The defrosting simulation design method provided in this article has certain engineering guidance significance for optimizing the defrosting performance design of air conditioning systems in automotive research and development.

Key words: Air conditioning defrosting; CFD; Simulation analysis; Transient coupling

摘要： 文章运用计算流体动力学（CFD）分析方法对某微型汽车空调除霜性能进行仿真分析 研究，通过稳态 CFD 分析结果对空调除霜风管进行结构优化，并利用一维/三维瞬态耦合仿真 对不同空调正温度系数（PTC）配置下除霜风温温升及风窗玻璃表面除霜瞬态过程进行分析 研究，为空调的流场性能优化及 PTC 性能选型提供有效参考，结果显示风道结构优化后配合 2.5 kW 功率 PTC，可以满足除霜性能要求。文章提供的除霜仿真设计方法对汽车研发中空调 系统除霜性能设计优化具有一定工程指导意义。

关键词: 空调除霜；CFD；仿真分析；瞬态耦合