用于供冷的闭式冷却塔换热模型与性能分析

目的分析闭式冷却塔内各参数。即空气焓值、含湿量、冷却水温等的分布情况；探讨空气入口参数、空气质量流量、喷淋水量对闭式冷却塔冷却性能的影响规律．方法通过对闭式冷却塔内部换热机理的分析，建立描述冷却塔内传热传质性能的数学模型，并得到模型的解析解．结果闭式冷却塔结构参数不变时，随着入口空气湿球温度的升高，冷却水出口温度升高；随着空气质量流量和喷淋水量的增加，冷却水出口温度降低，但是变化斜率逐渐减小，即存在着一最佳喷淋水量和空气质量．结论利用闭式冷却塔数学模型的解析解，可以实现分析空气和喷淋水参数对闭式冷却塔供冷性能的影响及各参数沿闭式冷却塔高度的分布情况，为闭式冷却塔的结构设计及性能优化提供帮助．

Modeling and Performance Analysis of the Closed Cooling Tower

The effect of the inlet parameters of air,air mass flow rate and spray water rate on the performance of closed cooling tower is discussed in the paper.A mathematical model for evaluating heat and mass transfer performance of closed cooling tower is set up.The analytical solution of differential equations is derived.It is found that for the fixed dimension,an increase in wet bulb temperature of air results in an increase in cooling water temperature at the exit of the cooling tower.The exit temperature of the cooling water also decreases with an increase in air mass flow rate and spray water rate.However,the rate of decrease in cooling water exit temperature decreases with an increase in air mass flow rate and spray water rate.The results show that the analytical solution of mathematical model can be used to predict the performance of closed cooling tower and the parameter distribution along the height of cooling tower,which is favorable for optimization of the design and operating of the cooling tower.