| 摘要: |
| 本文搭建了压力可调的封闭环境仓，通过实验研究了40~101 kPa低压环境下，不同的管排数和循环热水温度对翅片管冷凝器空气侧对流换热特性的影响。结果表明：在相同的雷诺数下，环境压力的降低导致空气侧对流换热减小，当空气侧雷诺数为400时，环境压力从101 kPa降至40 kPa，对流换热系数随之降低44.1%；随着环境压力的降低，管排数对空气侧对流换热的影响变弱；在低压环境下，改变循环热水温度不会对换热系数产生明显影响。随着环境压力的降低，空气侧的对流换热系数越来越偏离常压模型的计算结果，当环境压力从101 kPa降至40 kPa时，平均偏差从17.3%增至77.5%。在实验的基础上，本文根据环境压力、管排数对空气侧对流换热的影响，对常压下的翅片管空气侧换热模型进行了修正。 |
| 关键词: 翅片管冷凝器 低压 对流换热 雷诺数 |
| DOI： |
| Received:June 18, 2020Revised:September 09, 2020 |
| 基金项目:上海市部分地方院校能力建设专项计划项目（16060502600） |
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| Study on the Characteristics of Air Side Heat Transfer for Finned Tube Condenser in Low-pressure Environment |
|
Zhang Ruhang1, Liu Jianhua1,2, Zhang Liang1
|
| (1.College of Energy and Power Engineering，University of Shanghai for Science and Technology;2.Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering) |
| Abstract: |
| In this study, a pressure-adjustable closed environment chamber was built, and the effect of different tube rows and circulating hot water temperatures on the characteristics of air-side convective heat transfer for a finned tube condenser at a low-pressure environment of 40–101 kPa were studied. The results show that under the same Reynolds number, the reduction in ambient pressure leads to a reduction in air-side convective heat transfer. When the air-side Reynolds number is 400, the ambient pressure decreases from 101 kPa to 40 kPa, and the convective heat transfer coefficient decreases by 44.1%. As the ambient pressure decreases, the number of tubes has a weaker effect on the air-side convective heat transfer. In a low-pressure environment, changing the heating temperature of the circulating water does not have a significant impact on the heat transfer coefficient. As the ambient pressure decreases, the air-side convective heat transfer coefficient deviates from the calculation results of the normal atmospheric pressure model. As the ambient pressure decreases from 101 kPa to 40 kPa, the average deviation increases from 17.3% to 77.5%. Based on the experiment results, the air-side heat transfer model of the finned tube is modified at normal pressure according to the influence of the ambient pressure and the tube rows on the air-side convective heat transfer. |
| Key words: finned tube condenser low pressure convective heat transfer Reynolds number |
