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首页> 外文期刊>International Journal of Heat and Mass Transfer >A new method for prediction and analysis of heat and mass transfer in the counter-flow dew point evaporative cooler under diverse climatic, operating and geometric conditions
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A new method for prediction and analysis of heat and mass transfer in the counter-flow dew point evaporative cooler under diverse climatic, operating and geometric conditions

机译：预测和分析逆流露点蒸发式冷却器中各种气候，运行和几何条件下传热和传质的新方法

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摘要

Dew point evaporative cooler, regarded as a zero polluting and energy efficient cooling device, has evolved to be a key technology in air-conditioning systems. The water evaporating process in the cooler is a key performing factor as it leads to the heat sink phenomenon. The cooling effectiveness is dictated by its heat and mass transfer coefficients. The conventional methods (mean temperature difference and integration methods) of obtaining these coefficients have limitations. In this work, a new method to determine these coefficients is proposed. Firstly, aNTU-Le-Rmodel is installed to detect these coefficients. It is based on the outlet data of the dew point evaporative cooler. Next, a two-dimensional computational fluid dynamic model is developed to simulate the evaporative cooling process within the cooler and compute the outlet data for theNTU-Le-Rmodel. Upon validation, results from the computational fluid dynamic model demonstrate close agreement to within±6.0%with results acquired from experiments. Finally, the effects of the various conditions on the heat and mass transfer coefficients, including climatic, operating and geometric conditions, are judiciously investigated. The new proposed method has the capability to capture the essential boundary conditions to precisely obtain the transfer coefficients. In contrast to existing practices that combine the assumption of the Nusselt number under constant surface heat flux or temperature conditions with the Chilton-Colburn analogy. This new method simplifies computation while providing accurate data to realize optimum design of the dew point evaporative cooler.
机译：露点蒸发冷却器，被认为是一种零污染且节能的冷却装置，已发展成为空调系统中的一项关键技术。冷却器中的水蒸发过程是关键的执行因素，因为它会导致散热现象。冷却效率由其传热系数和传质系数决定。获得这些系数的常规方法（平均温度差和积分方法）有局限性。在这项工作中，提出了一种确定这些系数的新方法。首先，安装一个NTU-Le-Rmodel来检测这些系数。它基于露点蒸发冷却器的出口数据。接下来，建立了二维计算流体动力学模型，以模拟冷却器内的蒸发冷却过程并计算NTU-Le-R模型的出口数据。验证后，计算流体动力学模型的结果与实验获得的结果吻合在±6.0％以内。最后，明智地研究了各种条件对传热和传质系数的影响，包括气候，操作和几何条件。新提出的方法具有捕获基本边界条件以精确获得传递系数的能力。与现有的做法相反，该做法将恒定表面热通量或温度条件下的Nusselt数假设与Chilton-Colburn类比相结合。这种新方法在提供准确数据的同时简化了计算，从而实现了露点蒸发冷却器的最佳设计。

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