逆流式露点间接蒸发冷却器性能及优化研究

3D simulation and performance study of an indirect evaporative cooler with counter-flow and dew-point

对逆流式间接蒸发冷却器的性能进行研究,分析其进出口空气速度及通道的变化对性能的影响,并基于响应面曲线法对其性能进行优化。结果显示,在进气速度0.5m/s^4m/s的范围内,通道高度分别为3mm、5mm和7mm时,温度能降低16.81K、15.71K和13.1K,工作通道进出口压力差值变化分别为24.23Pa^481.46Pa、21.65Pa^241.13Pa和12.65Pa^163.09Pa,表明较小尺寸的通道可以实现更好降温效果,而较大尺寸的通道压力变化较小,可见进气速度和通道尺寸对蒸发冷却器的性能影响十分显著;进一步的优化获得了最优的性能参数,为间接蒸发冷空调的应用提供了理论指导。

The performance of counter - current type indirect evaporative cooler was investigated and optimized based the response surface curve method. The influence of the change of air velocity and flow channel on heat transfer performance was analyzed. The result shows that when the air velocity is around 0. 5 -4m/s, the height of channel is 3ram, 5mm, 7mm respectively; the temperature can drop 16.81 K, 15.71K and 13. 097K, respectively. The pressure differences of work channels between inlet and outlet is 24. 299Pa - 481.46Pa, 21. 648Pa -241.13Pa and 12. 648Pa -163.09Pa, respectively. It reveals that the smaller channel can achieve lower temperature, and the bigger channel can decrease the pressure drop. It can be seen that the inlet velocity and the channel size have great influence on heat transfer performance of evaporative cooler; the optimal parameters of performanee is obtained which can provide the theoretical reference for the application of indirect evaporative cooler.