流体机械

2019, v.47;No.568(10) 75-81

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新风风量对间接蒸发冷却器冷凝区域和性能的影响
The Effect of Primary Air Volume Flow on Condensation Area and Performance of Indirect Evaporative Cooler

李晗;吕建;李勇刚;郭春梅;孟丹东;
Li Han;Lv Jian;Li Yonggang;Guo Chunmei;Meng Dandong;School of Energy and Safety Engineering,Tianjin Chengjian University;Tianjin Institute of Architectural Design;

摘要(Abstract):

高温高湿地区,由于新风的相对湿度较大,干通道内板面上容易发生冷凝,从而影响换热器的性能。本文通过可视化的试验装置观察新风风量对干通道内冷凝区域的影响,分析冷凝条件下新风风量对新风出口温度、湿球效率、换热量、冷凝量和耗水量等性能的影响。试验结果显示:增加新风风量可以减少冷凝区域,但当新风风量超过700 m~3/h,新风风量对冷凝区域影响较小。减小新风风量可以减少换热,但也可以降低出口温度和耗水量,提高了湿球效率。当风量为500~900 m~3/h时,新风出口温度最低为24.57℃,湿球效率最大为57.77%,耗水量最大为1.38 g/s。此外,新风风量对潜热换热量和冷凝量影响较小。
In hot and humid regions,the performance of indirect evaporative cooler is influenced by condensation occurring in the dry channels due to higher relative humidity of primary air,which affects the performance of the heat exchanger. A visualized indirect evaporative cooler(IEC) was constructed to investigate the effects of primary air volume on condensation area in the dry channels,outlet primary air temperature,wet bulb efficiency(wb-effectiveness),heat transfer rate,condensation rate,water consumption rate,etc.The test results show that increasing the primary air volume can reduce the condensation area. However,when the primary air volume exceeds 700 m~3/h,the primary air volume slightly affects the condensation area. Decreasing the primary air volume can reduce the outlet primary air temperature,but it can reduce the outlet temperature and water consumption rate,thus improves the wb-effectiveness.When the primary air volume ranged from 500 to 900 m~3/h,the minimum outlet primary air temperature was 24.57 ℃,the maximum wb-effectiveness was 57.77% and water consumption rate was 1.38 g/s. Furthermore,the latent heat transfer and condensation rate were slightly affected by the primary air volume.

关键词(KeyWords): 间接蒸发冷却器;新风风量;高温高湿地区;可视化试验台
indirect evaporative cooler;primary air volume;hot and humid regions;visualized test bench

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基金项目(Foundation): 国家自然科学基金资助项目(51678385)

作者(Author): 李晗;吕建;李勇刚;郭春梅;孟丹东;
Li Han;Lv Jian;Li Yonggang;Guo Chunmei;Meng Dandong;School of Energy and Safety Engineering,Tianjin Chengjian University;Tianjin Institute of Architectural Design;

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