逆流波纹板式露点蒸发冷却器的数值模拟研究
Numerical Simulation of a Counter-flow Corrugated Plate Dewpoint Evaporative Cooler

本文对逆流波纹板式露点蒸发冷却器的性能进行了数值模拟，并通过实验结果验证了数值模拟的准确性.通过数值模拟，研究了二次/一次风量比、一次风风速、循环水流量、进风参数、结构参数（通道长度和通道宽度）对露点蒸发冷却空调器性能的影响。结果表明，当二次风占一次风的比例为0.3~0.4，一次风风速为2~2.7 m/s，通道间距为4.3 mm，通道长度为1 m时，露点蒸发冷却空调器冷却效率及COP均较高；随循环水流量的增加，送风温度升高，冷却效率及COP均下降，因此在湿通道表面完全润湿条件下，循环水流量越小，露点蒸发冷却器性能越好。进口空气温湿度对露点蒸发冷却器影响的研究结果表明，本文采用的逆流波纹板式露点蒸发冷却器，湿球效率在110%~115%之间。
The performance of a counter-flow corrugated plate dewpoint evaporative coolerwas simulated by a numerical model which was verified by experimental results.The influence of the secondary-to-primary air ratio, intake air velocity, circulating water flow rate, intake air parameters, and geometrical parameters on the performance of a dewpoint evaporative cooler was investigated by the model. The results show that the cooling efficiency and coefficient of performance (COP) of the cooler are both high when the working-to-intake air ratio is 0.3–0.4, the intake air velocity is 2–2.7 m/s, the channel gap is 4.3 mm, and the channel length is 1 m. The cooling efficiency and COP are decreasedwhen the supply air temperature and the flow rate of the circulating water are increased. Therefore, the cooling performance of the cooler is improved as the flow rate of the circulating water is lower when the wet surface is totally wetted. The influence of the inlet air temperature and humidity on the cooler showsthat the wet-bulb efficiency of the studied cooler is between 110% and 115%