R22在矩形微细管内凝结换热的实验研究

通过实验研究了R22在当量直径为0.952 mm水平不锈钢矩形管内的凝结换热过程。实验时的饱和温度为40~50℃、质量流速为200~800 kg/（m^2·s）、干度为0~1。研究结果表明：R22的凝结换热系数随质量流速和干度的增大而增大,在较高干度区增大趋势更加明显,随饱和温度的增大凝结换热系数减小。然后将实验结果与三种已有换热关联式进行了对比,在与R22相比时发现,在相同实验工况下R152a的凝结换热系数大于R22的凝结换热系数。...

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Bibliographic Details
Published in制冷学报 Vol. 34; no. 6; pp. 17 - 21
Main Author 刘纳 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 2013
Subjects
凝结换热
实验研究
微通道
换热系数
microchannel
换热系数
experimental investigation
实验研究
heat transfer coefficients
condensation heat transfer
凝结换热
微通道
Online AccessGet full text
ISSN0253-4339
DOI10.3969/j.issn.0253-4339.2013.06.017

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Summary:通过实验研究了R22在当量直径为0.952 mm水平不锈钢矩形管内的凝结换热过程。实验时的饱和温度为40~50℃、质量流速为200~800 kg/（m^2·s）、干度为0~1。研究结果表明：R22的凝结换热系数随质量流速和干度的增大而增大,在较高干度区增大趋势更加明显,随饱和温度的增大凝结换热系数减小。然后将实验结果与三种已有换热关联式进行了对比,在与R22相比时发现,在相同实验工况下R152a的凝结换热系数大于R22的凝结换热系数。
Bibliography:The paper reported heat transfer coefficients of R22 during condensation in a horizontal stainless steel rectangular microchannel with the hydraulic diameter of 0.952 mm.Tests were conducted with saturation temperatures of 40~50℃,mass fluxes of 200~800 kg /（m2·s） and vapor qualities from 0 to 1.The results show that heat transfer coefficients of R22 increase with mass flux and vapor quality especially in high vapor quality regions while decrease with the saturation temperature.The data were compared with three existing heat transfer correlations.Heat transfer coefficients of R152a are larger than the data of R22 when compared with the same experimental conditions.
Liu Na Li Junming （ Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engi- neering, Tsinghua University, Beijing, 100084, China）
11-2182/TB
condensation heat transfer; microchannel; heat transfer coefficients; experimental investigation
ISSN:0253-4339
DOI:10.3969/j.issn.0253-4339.2013.06.017