横流式冷却塔传热模型与影响因素研究

Research on heat transfer model and affecting factors for cross flow cooling towers

根据Merkel的冷却塔传热传质理论,推导了适应于横流式冷却塔的传热模型,通过理论模型正交试验和实测数据因子相关性分析,研究了横流式冷却塔传热性能的影响因素。实测数据因子相关性分析结果表明,风量对横流式冷却塔传热性能影响程度最小,与理论模型正交实验结果存在一定的差异。运行时应保证横流式冷却塔进水流量的分布均匀,才能更有效的利用传热面积,提高横流式冷却塔传热效率。

The heat transfer model was derived for cross flow cooling towers according to heat and mass transfer theory put forward by Merkel for cooling towers. Affecting factors of heat transfer performance for cross flow cooling towers were studied through orthogonal experiments of theoretical model and correlation factor analysis of the measured data. The results of correlation factor analysis of the measured data show that the influence of air volume is minimized, and there exist some differences with the orthogonal experiments of theoretical model. The water flow of cross flow cooling towers should be ensured uniform distribution in runtime, in order to make more use of heat exchange area effectively and improve thermal efficiency for cross flow cooling towers.