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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Numerical study of the thermal-hydraulic performance of evaporative natural draft cooling towers
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Numerical study of the thermal-hydraulic performance of evaporative natural draft cooling towers

机译：蒸发自然通风冷却塔热工水力性能的数值研究

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摘要

In this paper, the mathematical and physical models governing the flow, mass and heat energy of moist have been set up for an evaporative natural draft cooling tower. The models consider the effect of nonspherical shape of water drops on the flow, heat and mass transfer. Experimental data has been adopted to validate the numerical scheme. Average difference between the measured and the predicted outlet water temperature is 0.26℃. Distributions of the velocity components of the moist air, density, pressure, enthalpy and moisture content, the water temperature and its mass flux have been predicted. The simulation shows that some recirculation exits under the lower edge of the shell, where the air enthalpy, temperature, humidity and moisture content are higher, but the density is lower. The simulation also proves that the main transfer processes take place in the fill region where the percentage of latent heat transfer is predicted as 83%. However, about 90% of the heat energy is transferred via evaporation in the rain region although the total heat transfer rate there is very small compared to the fill region. Hourly performance of a natural draft cooling tower under the meteorological condition of Singapore has also been predicted.
机译：在本文中，已经为蒸发自然通风冷却塔建立了控制湿流，质量和热能的数学和物理模型。这些模型考虑了水滴的非球形形状对流量，热量和质量传递的影响。实验数据已被采用来验证数值方案。测得的温度与预测的出口水温之间的平均差为0.26℃。预测了湿空气的速度分量，密度，压力，焓和水分含量，水温及其质量通量的分布。模拟表明，在壳的下边缘下方存在一些再循环，空气的焓，温度，湿度和水分含量较高，而密度较低。该模拟还证明了主要的传递过程发生在填充区域，在该区域中潜热传递的百分比预计为83％。然而，尽管雨水区域的总传热率与填充区域相比非常小，但约90％的热能是通过雨水区域的蒸发传递的。还预测了新加坡气象条件下自然通风冷却塔的每小时运行性能。

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