水平1EHT管内R22、R32、R410a冷凝换热特性实验研究  

Experimental Study on Condensation Heat Transfer Characteristics of R22、R32 and R410A inside the Horizontal 1EHT Tube

作　　者：仇富强 QIU Fuqiang(School of Electrical Engineering,Tongling University,Tongling 244061,China)

机构地区：[1]铜陵学院电气工程学院,安徽铜陵244061

出　　处：《安阳工学院学报》2022年第4期34-38,共5页Journal of Anyang Institute of Technology

基　　金：铜陵学院人才科研启动基金项目(2021tlxyrc25);铜陵学院教学研究项目(重点)(2021xj004)。

摘　　要：以R22、R32、R410a为研究对象,研究了其在内径为11.7 mm的水平光滑管及1EHT强化管内的冷凝换热特性。具体实验工况为:冷凝温度43℃,制冷剂循环流量为60-180 kg/(m2s),热流密度10-30 kJ/(m2s),且试验段进、出口制冷剂过热/过冷度为2-3℃。根据实验得出制冷剂在两测试管内的冷凝换热系数,并以此对换热性能进行评价。结果表明:换热系数与质量流量成正比;相比于光滑管,R22、R32、R410a在1EHT强化管换热强化倍率分别是1.75-1.95、1.31-1.39、1.80-1.91,换热面积和换热机制对管内换热的强化有很大影响。在光滑管内,R32的换热系数约为R22、R410a换热系数的1.27-1.34倍,而R22和R410a的换热系数接近;在1EHT强化管内,制冷剂物理性质对传热系数的影响随着质量流量的增加而减弱。The condensation heat transfer characteristics of R22, R32 and R410A inside the horizontal 11.7 mm inner diameter smooth and EHT tubes was experimental studied in the paper. The specific experimental condition:condensation temperature of 43℃, mass fluxes of 60-180 kg/(m2s), heat fluxes of 10-30 kJ/(m2s), and refrigerant keeps degree of superheat/degree of supercooling of 2-3℃ at the import and export of test section. Acording to the experiment, the condensation heat transfer coefficient of refrigerant in two test tubes is obtained, and the heat transfer performance is evaluated. The results show that the heat transfer coefficient is directly proportional to the mass flux;Compared with smooth tubes, the heat transfer enhancement ratios of R22, R32 and R410A inside the 1EHT tubes is 1.75-1.95, 1.31-1.39 and 1.80-1.91 respectively. The heat transfer area and heat transfer mechanism have a great influence on the heat transfer enhancement in tubes. In the smooth tube, the heat transfer coefficient of R32 is about 1.27-1.34 times that of R22 and R410A, and the heat transfer coefficients of R22and R410A are very close;In the 1EHT tube, the influence of refrigerant physical properties on the heat transfer coefficient weakens with the mass flux.

关 键 词：1EHT强化管 冷凝换热 强化倍率 换热机制 制冷剂物性 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]