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An Analytical Approach to the Heat and Mass Transfer Processes in Counterflow Cooling Towers

机译：逆流冷却塔传热传质过程的解析方法

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摘要

Quick and accurate analysis of cooling tower performance, outlet conditions of moist air, and parameter profiles along the tower height is very important in rating and design calculations. This paper developed an analytical model for the coupled heat and mass transfer processes in counterflow cooling towers based on operating conditions more realistic than most conventionally adopted Merkel approximations. In modeling, values of the Lewis factor were not necessarily specified as unity. Effects of water loss by evaporation and water film heat transfer resistance were also considered in the model equations. Within a relatively narrow range of operating conditions, the humidity ratio of air in equilibrium with the water surface was assumed to be a linear function of the surface temperature. The differential equations were rearranged and an analytical solution was developed for newly defined parameters. The analytical model predicts the tower performances, outlet conditions, and parameter profiles quickly and accurately when comparing with the numerical integration of the original differential equations.
机译：快速，准确地分析冷却塔性能，潮湿空气的出口情况以及沿塔高的参数分布对于额定值和设计计算非常重要。本文基于比大多数常规采用的默克尔逼近更现实的运行条件，开发了逆流冷却塔中传热传质过程耦合的分析模型。在建模中，刘易斯因子的值不一定指定为1。模型方程式中还考虑了蒸发引起的水分流失和水膜传热阻力的影响。在相对狭窄的运行条件范围内，与水表面平衡的空气湿度比被认为是表面温度的线性函数。重新排列了微分方程，并为新定义的参数开发了解析解决方案。与原始微分方程的数值积分相比，该分析模型可以快速，准确地预测塔的性能，出口条件和参数曲线。

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