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摘要： 应用相似缩小模型代替实际模型研究了室外机与环境空气的换热过程。以某VRF空调系统室外机为原型，选取Gr/Re2为特征数，结合根据能量方程推导出的热源强度比例关系式，阐述了相似模型（几何比例取1 ∶ 3）的设计过程。获得了该相似模型换热过程中的速度和温度分布，并与原型的测试结果进行了比较。结果表明二者吻合度较好，验证了相似准则选取的准确性和利用相似模型来研究室外机与环境空气换热的可行性。 关键词： 室外机 空调 相似准则 缩小模型 实验 Study of similarity model of heat transfer for outdoor units of VRF air conditioning systems By Zhang Tengfei★, Zhang Jian，Wang Shugang, Daizo Takaoka and Ju Wenjuan Abstract Studies the heat transfer process of outdoor units with ambient air by a similarity scale model substituting for the actual one. With outdoor units of an actual VRF air conditioning system as prototype and the dimensionless similarity number of Gr/Re2 as similarity criteria, expounds the design process of similarity model of geometric scale 1/3 based on similarity relation of heat source intensity deduced from the energy balance equation. Obtains the velocity and temperature distribution of heat transfer of the similarity model, and compares it with that of prototype test results. The appropriate agreement verifies the accuracy of similarity criteria and practicability of the similarity model used to study the heat transfer of outdoor units with ambient air. Keywords outdoor unit, air conditioning, similarity criteria, reduced scale model， experiment ★ Dalian University of Technology, Dalian, Liaoning Province, China