为研究近临界压力下R410A在水平螺纹管内的冷凝换热特性，在质量流率为200～800 kg/(m2•s)、干度为0.1~0.9、冷凝压力比为0.8和0.9时，对3种不同管径的内螺纹铜管（5、7和9.52 mm）进行单管冷凝换热实验。结果表明：冷凝换热系数随着质量流率和干度的增加而增加，冷凝压力越接近临界压力，换热系数越小；利用已有的近临界压力下的换热关联式对波状流进行预测，Garimella关联式结果较好，有87%的数据在±25%的预估偏差率以内；对环状流进行预测，Sunil关联式的预测效果比较好，有79%的数据在±25%的预估偏差率以内。

In order to study the condensation heat transfer performance of R410A in a horizontally innerthreaded tube at nearcritical pressure,This article performs the condensation heat transfer experiment for internal threaded copper pipes of 3 different diameters at a mass flow rate of 200 to 800 kg/(m2 • s),a dryness of 0.1 to 0.9,and a condensation pressure drop of 0.8 and 0.9.The results show that the condensation heat transfer coefficient increases with increasing mass flow rate and dryness.The closer the condensation pressure approaches the critical pressure,the smaller the heat transfer coefficient.By comparing existing heat transfer correlations at near critical pressures,Garimella′s predictions for wavy flow are good,with 87% of the data within ±25% of the estimated deviation rate.For the prediction of annular flow,the prediction effect of Sunil correlation is better,with 79% of the data within ±25%.

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上海市部分院校能力建设专项计划（16060502600）