| 摘要: |
| 本文实验研究了2个具有不同翅片间距的平翅片管式换热器在低环境气压以及析湿工况下空气侧的传质特性，在环境气压为40~100 kPa，换热器入口空气风速为0.5~4 m/s，入口空气相对湿度为50%~90%，入口空气干球温度为27 ℃，水流速为1.65 m/s的实验工况下，分析了环境气压、换热器迎面风速、翅片间距及入口空气相对湿度对换热器空气侧传质特性的影响。结果表明：低气压环境下，迎面风速、翅片间距以及相对湿度对换热器空气侧传质因子的影响趋势与常压下的研究一致；研究工况下，环境压力从40 kPa升至100 kPa时，空气侧传质因子下降幅度为18.2%~23.6%；在较低迎面风速和环境气压下，翅片间距和换热器入口空气相对湿度对换热器空气侧传质特性的影响更加显著。 |
| 关键词: 低气压 析湿工况 传质 翅片管换热器 |
| DOI： |
| 投稿时间：2021-03-09 修订日期：2021-05-21
|
| 基金项目:上海市部分地方院校能力建设专项计划（16060502600）资助。 |
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| Experimental Study on Airside Mass Transfer Characteristics of Fin-and-tube Heat Exchangers at Low Ambient Pressure |
|
Yuan Yunxiao1, Zhang Liang1, Liu Jianhua1, Zhang Jiawen1, Liu Qi2
|
| (1.Refrigeration Technology Institude, University of Shanghai for Science and Technology;2.Air International Thermal System China) |
| Abstract: |
| The airside mass transfer characteristics of two-plate fin-and-tube heat exchangers with different fin spacings were experimentally studied under low ambient pressure and dehumidifying conditions. The experimental conditions comprised an ambient pressure range 40–100 kPa, inlet air velocity 0.5–4 m/s, inlet air relative humidity 50%–90%, inlet air dry bulb temperature 27 ℃, and water flow velocity 1.65 m/s. The effects of ambient pressure, air velocity, fin spacing, and relative humidity of the inlet air on the airside mass transfer characteristics of the heat exchanger were investigated. The results showed that under low ambient pressure, the effects of face air velocity, fin spacing, and inlet air relative humidity on the air side mass transfer coefficient of the heat exchanger is consistent with that under normal ambient pressure. When the ambient pressure increased from 40 kPa to 100 kPa, the air-side mass transfer coefficient decreased by 18.2%–23.6%. Under low air velocity and ambient pressure, the effects of fin spacing and inlet air relative humidity on the air-side mass transfer characteristics are more significant. |
| Key words: low ambient pressure, dehumidifying conditions, mass transfer, fin-and-tube heat exchanger |
