回热式间接蒸发冷却地区适应性的数值模拟  

Numerical study of regional adaptability 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：《西安工程大学学报》2023年第5期69-76,共8页Journal of Xi’an Polytechnic University

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

摘　　要：为了优化回热式蒸发冷却器在不同气候条件下的换热特性,以不同气候条件下国内外代表城市为应用背景,根据回热式蒸发冷却器结构构建仿真模型,利用数值模拟方法研究气流通道内的热湿参数变化。结果表明,湿通道中相对湿度增长迅速,40 cm长的湿通道长度可满足多数工况下的充分蒸发需求。蒸发冷却效果受入口空气参数影响较大,环境空气的饱和程度对降温效果影响显著。二次空气相对湿度高于95%后蒸发过程趋于动态平衡,应优化湿表面长度,将潜热换热过程保持在高效蒸发段。对于一二次空气温差高于5℃的部分,可根据需要按单纯的气-气显热换热进行优化设计,将显热交换过程保持在通道高温差段,可有效提升蒸发冷却器换热效率,缩短换热器长度。In order to optimize the heat transfer characteristics of regenerative evaporative coolers under different climatic conditions and provide reference data for numerical simulation research.The dynamic coupling of heat and humidity parameters of the air flow in the regenerative evaporative cooler is the fundamental factor affecting the efficiency of evaporative heat transfer,and mastering its law can guide the structure optimization of the heat exchanger.In this paper,a simulation model is constructed based on the structure of regenerative evaporative cooler,and the variation of heat and humidity parameters in the airflow passage is studied by numerical simulation method with the application background of representative cities at home and abroad under different climate conditions.It is found that the relative humidity increases rapidly in the wet channel,and the length of 40 cm wet channel can meet the full evaporation demand under most working conditions.The evaporation cooling effect is greatly affected by the inlet air parameters,and the saturation degree of ambient air has a significant influence on the cooling effect.Keeping the latent heat exchange process in the high efficiency evaporation section and the sensible heat exchange process in the high temperature difference section of the channel can effectively improve the heat exchange efficiency of the evaporative cooler and shorten the length of the heat exchanger.

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：TQ051.1[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]