| 摘要: |
| 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/（m2 ? 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。 |
| 关键词: 凝结换热 微通道 实验研究 换热系数 |
| DOI： |
| 投稿时间：2012-11-19
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| 基金项目: |
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| Experimental Investigation on Heat Transfer of R22 during Condensation in a Rectangular Microchannel |
| Liu Na,Li Junming |
| (Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University) |
| Abstract: |
| 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. |
| Key words: condensation heat transfer microchannel experimental investigation heat transfer coefficients |
