一款单管管内沸腾/冷凝换热试验台的设计及性能实验分析  

Design and Performance Analysis of the Boiling/Condensation Heat Transfer Test Rig inside Single Tube

作　　者：仇富强[1] 杨伟兵[2] 范容君[1] 王文璟 李垒[3] 

机构地区：[1]铜陵职业技术学院电气工程系,安徽铜陵244061 [2]漯河职业技术学院机电工程系,河南漯河462002 [3]枣庄学院机电工程学院,山东枣庄277160

出　　处：《枣庄学院学报》2017年第5期62-70,共9页Journal of Zaozhuang University

基　　金：安徽省重点自然科学基金项目(项目编号:KJ2016A711)

摘　　要：针对现有的单管换热测试实验台仅能满足某一物性制冷剂的测试,工况调节范围较小,仅能满足沸腾或者冷凝单一换热特性的特点,提出并设计了一款单管管内沸腾/冷凝换热试验台。并以R22为工质,在四种工况条件下对其进行了运行的性能实验。结果表明:本实验台可在较大工况范围内研究无油状态下不同物性制冷剂在不同管径或不同类型强化管管内的蒸发/冷凝换热特性;实验时随着制冷剂流量的增加,测试段压降均呈递增趋势,且1工况压降要比2工况高约20%,而3工况的压降仅仅稍高于4工况;随着制冷剂流量的增加,换热系数hr也是逐渐变大的,在相同质量流量下,1工况换热系数hr比2工况的高约10%,而3工况下换热系数hr仅仅稍高于4工况的。经误差分析得知,水侧换热系数hw、总传热系数K、制冷剂侧换热系数hr、压降△P最大相对误差分别为:0.5%、10.5%、10.9%、0.14%.In view of the existing single heat transfer test rig which can only suitable for a refrigerant properties test, has a small regulation range, can only be applicable for the boiling or condensation heat transfer characteristics of single characteristic, a single tube boiling / condensing heat exchanger test - bed was proposed and designed, and experiment was conducted on using R22 as refrigerant in four condition, the results showed that the platform can be applied to test the evaporation / condensation heat transfer characteristics of different kinds of refrigerant in different diameters or different types of enhanced tubes in case without oil on a large operating range ; as the refrigerant flow increased, pressure drop test showed a trend of increasing, and the pressure drop in 1 condition is higher about 20% than the 2 conditions, while the pressure drop in 3 condition only slightly higher compared to the 4 conditions ; as the increase in refrigerant flow, the heat transfer coefficient hr is also increased gradually, in case of the same mass flow rate, the of heat transfer coefficient hr in 1 conditions is higher about 10% than the 2 conditions, while the heat transfer coefficient hr under the 3 condition is only slightly higher than the 4 conditions; the maximum relative error of the heat transfer coefficient hw in water side, the total heat transfer coefficient K, the heat transfer coefficient hr in refrigerant side, the pressure drop △P were 0.5% , 10.5% , 10.9% , 0.14% , respectively by error analyses.

关 键 词：换热器 沸腾 冷凝 误差分析 

分 类 号：TB663[一般工业技术—制冷工程]