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首页> 外文期刊>International Journal of Heat and Mass Transfer >Quantitative research of spray cooling effects on thermo-flow performance of the large-scale dry cooling tower with an integrated numerical model
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Quantitative research of spray cooling effects on thermo-flow performance of the large-scale dry cooling tower with an integrated numerical model

机译：集成数值模型对喷雾冷却对大型干式冷却塔热流性能影响的定量研究

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An integrated model with a coupling procedure was developed to combine the dynamics of spray injections and natural draft of the dry cooling tower. By the integrated model, the interaction was clearly revealed that pre-cooling slightly reduces the buoyancy and ventilation of the tower while enhancing heat transfer, but velocity decrease of inflow air in turn promotes droplet evaporation and enhances spray cooling effects. Under an example pre-cooling system, the calculated inflow air temperature drop is about 6.6% larger than that obtained by the traditional model which neglected this interaction. Moreover, spray cooling effects on tower performance were directly quantified by the integrated model, and the tower achieved 6.94% heat dissipation improvement and 2.75% ventilation decrease. According to streamlines, effective air inflow area of the tower gradually shrinks, which promotes the formations of interferences among the injections and severely impedes the evaporation process. Especially near the inlet of the radiator, evaporation rate hardly grows, and it gets worse under the case of more nozzles. The larger droplet size and the lower droplet velocity under a smaller spray pressure are adverse to droplet evaporation, and spray cooling makes little sense at low air temperature and especially high air humidity. The proposed integrated model is a powerful tool for spray cooling research and optimization for the dry cooling tower and some other large-scale objects. (C) 2019 Elsevier Ltd. All rights reserved.
机译：开发了具有耦合过程的集成模型，以结合喷雾注入的动态特性和干式冷却塔的自然通风。通过集成模型，相互作用清楚地表明，预冷却稍微降低了塔的浮力和通风，同时增强了热传递，但是流入空气的速度降低反过来又促进了液滴的蒸发并增强了喷雾冷却效果。在一个示例性预冷系统下，所计算的流入空气温度降幅比忽略了这种相互作用的传统模型所获得的降幅大约大6.6％。此外，通过集成模型直接量化了喷雾冷却对塔性能的影响，塔的散热效率提高了6.94％，通风量降低了2.75％。根据流线，塔的有效空气流入面积逐渐缩小，这促进了注入之间形成干扰，并严重阻碍了蒸发过程。尤其是在散热器的入口附近，蒸发率几乎不会增加，并且在喷嘴更多的情况下蒸发率会变得更差。在较小的喷雾压力下较大的液滴尺寸和较低的液滴速度不利于液滴蒸发，而喷雾冷却在低空气温度尤其是高空气湿度下几乎没有意义。所提出的集成模型是用于干式冷却塔和其他一些大型对象的喷雾冷却研究和优化的强大工具。 （C）2019 Elsevier Ltd.保留所有权利。

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