立管式间接蒸发冷却器的结构与性能试验研究

Structure and performance experimental study of vertical tube indirect evaporative cooler

为探索立管式间接蒸发冷却器可行性、结构与性能,设计了4组不同结构尺寸的冷却器并测试其降温性能,并对试验数据进行对比分析。结果表明,各试验冷却器温降均在6℃以上、湿球效率均在56%以上;增加换热面积可优化降温性能,冷却器单位面积处理风量宜控制在100~200 m^(3)/h之间;增大迎风面积、采用叉排布置增大流程可延长冷却时间,提高温降;增大管径可减小二次空气侧阻力,换热管宜采用30~50 mm管径圆管;采用管内直接布水与溢水相结合,并采用“上粗下细”的异径圆管,可保证换热管内壁形成稳定的贴附水膜,降温效果稳定。所得结果对立管式间接蒸发冷却器推广应用具有参考价值。

In order to explore the feasibility,experimental structure and performance of vertical tube indirect evaporative cooler,four groups of coolers with different structure and size were designed and its cooling performance was tested.The results show that the temperature drop of each cooler is above 6℃and the wet bulb efficiency is above 56%;The cooling performance can be optimized by increasing the heat exchange area,and the air volume per unit area of the cooler should be controlled between 100~200 m^(3)/h;The cooling time can be prolonged and the temperature drop can be improved by increasing the windward area and increasing the flow by using the fork row arrangement;Increasing the pipe diameter can reduce the secondary air side resistance,the heat exchange tube should use 30~50 mm diameter round pipe;The combination of direct water distribution and overflow in the tube,and the use of“thick at the top and thin at the bottom”reducing round pipe,can ensure that the inner wall of the heat exchange tube to form a stable attached water film,the cooling effect is stable.The results obtained have reference value for the popularization and application of tubular indirect evaporative cooler.