基于传递过程理论剖析湿球温度和绝热饱和温度

Analysis of Wet-bulb Temperature and Adiabatic Saturation Temperature Based on Transportation Process Theory

传递过程理论是理解和分析化工单元操作过程的有力工具。文章结合传递过程理论,探讨了湿空气-水体系在不同热边界条件下的接触过程,剖析了化工原理教材中关于湿球温度和绝热饱和温度的论述;基于传递过程理论和物料/热量衡算关系,建立了湿球温度和绝热饱和温度的严格计算式,并考察了水的初始条件对两个温度的影响;借助干湿比或干湿系数得到了湿球温度和绝热饱和温度之间的定量关系,实现了两个温度的简单计算和方便测量。

Transportation process theory is a powerful tool to understand and analyze the unit operations in chemical engineering.Using transportation process theory,the contacting process of moist air-water system under different thermal boundary conditions was discussed.Some statements about wet-bulb temperature and adiabatic saturation temperature in the classical textbook of principles of chemical engineering were clarified and theoretically analyzed in depth.The rigorous formulae to calculate the wet-bulb temperature and adiabatic saturation temperature were established based on transportation process theory and mass-energy balance relationship.The effects of initial conditions of water,such as temperature and quantity,on the temperatures were investigated.By means of psychrometric ratio or psychrometric coefficient,the quantitative relationship between wet-bulb temperature and adiabatic saturation temperature was obtained in order to achieve the simple calculation and easy measurement of both temperatures.