A new distributed parameter model of control volume scheme has been developed for different phase regions of the in-tube refrigerant flow, and the mathematical model was tested under changeable air flow rate in wet condition on refrigerant-side and air-side. Finally the model was used to analyze the performance of serpentine evaporator. The research on refrigerant-side shows that the parameters, including coefficient of heat transfer, temperature and pressure, change strongly in flow direction in non-uniform condition. By analyzing the effect of louver and angle on air-side heat transfer and pressure drop, a new type of louver fin is designed with an approximately 21% increase in heat transfer coefficient and only 4.5% increase in pressure drop compared with the present louver fin. It testifies that the model is not only reasonable and reliable, but also upper veracity.% 在湿工况下对管带式蒸发器进行了制冷剂侧和空气侧性能实验，还利用模型进行了管带式蒸发器性能的研究.制冷剂侧的研究表明：管带式蒸发器管内参数分布极不均匀，采用传统的集中参数模型计算很不合理.空气侧通过研究百叶窗角度对换热和压降的影响，改进了原有的翅片结构.相比原翅片，改进后的翅片空气侧表面传热系数提高在21%以上，但压降仅增大不到4.5%.该模型不仅合理可靠，而且具有较高的准确度.研究结果对汽车空调厂商在设计同类型产品时具有一定参考价值
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