R290和R22在水平细圆管内流动凝结换热的实验研究

实验研究了R290、1122在细圆管中的流动凝结换热特性。实验管内径为1．085mm，R22的质量流率为200—1200kg／（m2·s）：R290的质量流率为200—650kg／（m2·s），饱和温度分别为40℃与50℃。实验结果表明，高质量流率时R22在较高干度下换热系数随干度增加缓慢或略有下降，低质量流率时，11290在较小于度下出现换热系数下降。两种制冷剂蒸气相比，相同条件下R290的凝结换热系数高于1t22的。本文的实验结果还与现有典型关联式的计算结果作了对比，其中，Wangeta1．（2002）关联式对R290的实验数据预测偏差在17．5％之内，Kim et al．（2013）关联...

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Bibliographic Details
Published in制冷学报 Vol. 36; no. 5; pp. 22 - 29
Main Author 肖航 李俊明
Format Journal Article
LanguageChinese
Published 清华大学热能工程系 热科学与动力工程教育部重点实验室 北京 100084 2015
Subjects
R290
微细通道
流动凝结：对流换热
R290
minichannel
convective heat transfer
对流换热
flow condensation
流动凝结
微细通道
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ISSN0253-4339
DOI10.3969/j.issn.0253-4339.2015.05.022

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Summary:实验研究了R290、1122在细圆管中的流动凝结换热特性。实验管内径为1．085mm，R22的质量流率为200—1200kg／（m2·s）：R290的质量流率为200—650kg／（m2·s），饱和温度分别为40℃与50℃。实验结果表明，高质量流率时R22在较高干度下换热系数随干度增加缓慢或略有下降，低质量流率时，11290在较小于度下出现换热系数下降。两种制冷剂蒸气相比，相同条件下R290的凝结换热系数高于1t22的。本文的实验结果还与现有典型关联式的计算结果作了对比，其中，Wangeta1．（2002）关联式对R290的实验数据预测偏差在17．5％之内，Kim et al．（2013）关联式对R22的实验数据预测偏差在18．4％之内。
Bibliography:11-2182/TB
Xiao Hang Li Junming （Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engi- neering, Tsinghua University, Beijing, 100084, China）
minichannel; flow condensation; convective heat transfer; R290
The condensation heat transfer characteristics of R290 and R22 were investigated experimentally in a horizontal circular minitube with 1. 085 mm diameter. The mass flow rate of R22 is 200 - 1900 kg/（ m2 · s）, and that of R290 is 200 -650 kg/（ m2 ·s）. The saturation temperature is 40 ℃and 50 ℃ respectively during the experiment. The experimental results show that at the higher mass flow rate of R22, the condensation heat transfer coefficient increases slowly or even decreases little with the vapor quality increasing, for the R290 at a less mass flow rate, the heat transfer coefficient will decreases slightly at a low vapor quality. The condensation heat transfer coefficient of R290 is higher than that of the R22 at the same experimental conditions. The expe
ISSN:0253-4339
DOI:10.3969/j.issn.0253-4339.2015.05.022