回热式间接蒸发冷却器内部热湿工况实验研究  

Experimental Study on Internal Heat and Humidity Parameters of Regenerative Indirect Evaporative Cooler

作　　者：徐鹏[1] 穆昕 Xu Peng;Mu Xin(Beijing Key Lab of Heating,Gas Supply,Ventilating and Air Conditioning Engineering,Beijing University of Civil Engineering and Architecture,Beijing,100044,China)

机构地区：[1]北京建筑大学供热、供燃气、通风及空调工程北京市重点实验室,北京100044

出　　处：《制冷学报》2023年第4期133-140,共8页Journal of Refrigeration

基　　金：国家重点研发计划(2021YFF0306305)资助项目;北京市属高校基本科研业务费(X20064)资助。

摘　　要：本文基于自建的回热式间接蒸发冷却器实验样机,在狭窄的气流通道内部布设高精度温湿度传感器进行数据的动态采集,利用焓差室营造稳定的外部环境和通道入口参数,研究不同风速、一/二次空气质量比和环境参数对通道内气流热湿交换过程的影响规律。研究结果表明:二次空气饱和度变化迅速,其相对湿度高于95%时,蒸发过程基本饱和。即40 cm的湿通道长度可满足多数蒸发冷却器的设计需求。低风速和低空气质量比的工作条件下,蒸发冷却器饱和蒸发长度更短,同时降温幅度更大。对于干球温度为37.8℃,湿球温度为21.1℃的标准初始条件,通道风速恒定在0.5 m/s,经过10 cm的蒸发距离相对湿度即可升高至95.7%。环境空气的饱和程度对降温效果影响显著。在干球温度同为33.5℃的条件下,湿球温度为18.2℃的乌鲁木齐比湿球温度为26.4℃的北京二次空气平均温度低7℃。Based on a self-built indirect evaporative cooler experimental prototype,high-precision temperature and humidity sensors were placed inside a narrow airflow channel for dynamic data acquisition.An enthalpy difference chamber was used to create a stable external environment and hence inlet parameters for the channel.The influence of different inlet air velocities,primary to secondary air ratios,and environmental heat and humidity parameters on the heat and humidity exchange process of the airflow inside the channel was studied.The results showed that the relative humidity of the secondary air changed rapidly.When the relative humidity exceeds 95%,the evaporation process is saturated.A wet-channel length of 40 cm satisfies the design requirements of most evaporative coolers.At low air velocity and primary to secondary air ratios,the saturation evaporation length of the evaporative cooler was shorter,while the cooling capacity was higher.For the standard initial conditions of dry bulb temperature 37.8℃and wet bulb temperature 21.1℃,the channel air velocity was constant at 0.5 m/s,and the relative humidity rose to 95.7%after an evaporation distance of 10 cm.The relative humidity of the ambient air had a significant impact on the cooling performance.Under the same dry bulb temperature of 33.5℃,the average temperature of the secondary air in Urumqi with a wet bulb temperature of 18.2℃is 7℃lower than that in Beijing with a wet bulb temperature of 26.4℃.

关 键 词：蒸发冷却 回热循环 板式换热器 相对湿度 潜热 

分 类 号：TQ051.5[化学工程] TK172[动力工程及工程热物理—热能工程] TH12[机械工程—机械设计及理论]