水平圆管内R410A的凝结换热特性研究  

Study of Flow Condensation Heat Transfer Characteristics of R410A in Horizontal Circular Tube

作　　者：李庆普[1] 陶乐仁[1] 毛舒适 吴生礼 LI Qingpu;TAO Leren;MAO Shushi;WU Shengli(School of Energy-and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《轻工机械》2018年第3期67-72,共6页Light Industry Machinery

摘　　要：在一管内冷凝换热实验台上进行R410A流动冷凝换热实验,旨在研究水力工况、测试管管径对管内换热特性的影响进行探究。实验选用测试水雷诺数表征水力工况,选取换热系数、压降作为管内换热特性的衡量指标;并将实验数据与经典关联式预测值进行比较,扩展关联式的适用范围。实验结果显示:换热系数及压降均随着质量流速的增加、管径的减小逐渐增大,虽然换热系数随着测试水雷诺数的增加而减小,但测试水雷诺数对压降影响很小;Shah关联式和Thome关联式能够较好的预测实验数据,平均预测误差分别为18.83%和6.28%,而Akers关联式的预测值的平均误差达31.04%,足以证明其并不能准确预测实验数据。To study the effect of hydraulic conditions and inner diameter of the test tube on the heat transfer characteristics inside the tube,the experiment of flow condensation heat transfer of R410A was operated on an internal condensation heat transfer experiment platform.Water-testing Re was used to characterize the hydraulic conditions,heat transfer coefficient and pressure drop were selected as the measurement indexes in the experiment.The experimental data was also compared with the predictive value of some correlations in the experiment,extending the range of correlations application.Experimental results show： heat transfer coefficient and pressure drop increase with increasing mass flow and decreasing inner diameter of the test tube,although the heat transfer coefficient decreases with increasing water-testing Re,water-testing Re has a small influence on the pressure drop.The correlations of Shah and Thome can better predict the experimental data with average predictive error 18.83% and 6.28%,respectively; however,the average predictive error of Akers correlation reaches up to 31.04%,which is enough to prove that it does not accurately predict the data.

关 键 词：空调系统 制冷剂R410A 流动冷凝 换热系数 压降 关联式 

分 类 号：TB64[一般工业技术—制冷工程]