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首页> 外文期刊>International Journal of Heat and Mass Transfer >Analysis of heat-transfer performance of cross-flow fin-tube heat exchangers under dry and wet conditions
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Analysis of heat-transfer performance of cross-flow fin-tube heat exchangers under dry and wet conditions

机译：干湿条件下横流翅片管换热器的传热性能分析

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摘要

A three-dimensional analysis procedure for the detailed phenomenon in a fin-tube heat exchanger has been developed and applied to predict the heat/mass transfer characteristics of the wave-fin heat exchangers. The continuity, Navier-Stokes and energy equations together with the species equation for the air-vapor mixture are solved in a coupled manner, so that the inter-dependence between the temperature and the humidity can be properly taken into account, by using the SIMPLE-type finite volume method. Having validated the procedure, calculations have been carried out for various frontal-velocity and inlet-humidity conditions. It has been shown that the flow characteristics, such as the temperature and humidity fields, along with the local heat flux and the condensation rate, can be successfully captured. The numerical results reveal that the existing correlations considerably underestimate the fin efficiency especially for multi-row heat exchangers. For dehumidifying cases, the sensible heat-transfer rate seems insensitive to the inlet-humidity change. The rate changes mostly in the narrow band of partially wet regime between 25% and 40% of inlet relative humidity. The range of the frontal velocity that gives the best performance for various numbers of rows is also estimated. The analogy between the heat and mass transfer on the fin surface is also examined.
机译：翅片管式换热器中详细现象的三维分析程序已经开发出来，并用于预测波翅式换热器的热/质传递特性。通过耦合方式求解空气蒸汽混合物的连续性，Navier-Stokes和能量方程以及物种方程，从而可以通过使用SIMPLE适当考虑温度和湿度之间的相互依赖性。型有限体积法。在验证了程序之后，已经针对各种正面速度和入口湿度条件进行了计算。已经表明，可以成功捕获流动特性，例如温度和湿度场，以及局部热通量和冷凝率。数值结果表明，现有的相关性大大低估了翅片效率，特别是对于多排热交换器而言。对于除湿情况，明显的传热速率似乎对入口湿度的变化不敏感。该速率主要在部分相对湿度的窄带内在进口相对湿度的25％至40％之间变化。还估计了在各种行数下都能提供最佳性能的正面速度范围。还检查了散热片表面传热和传质之间的类比。

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