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首页> 外文期刊>International Journal of Heat and Mass Transfer >Direct contact condensation in packed beds
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Direct contact condensation in packed beds

机译：填充床中的直接接触冷凝

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A diffusion driven desalination process was recently described where a very effective direct contact condenser with a packed bed is used to condense water vapor out of an air/vapor mixture. A laboratory scale direct contact condenser has been fabricated as a twin tower structure with two stages, co-current and countercurrent. Experiments have been operated in each stage with respective saturated air inlet temperatures of 36, 40 and 43℃. The temperature and humidity data have been collected at the inlet and exit of the packed bed for different water to air mass flow ratios that vary between 0 and 2.5. A one-dimensional model based on conservation principles has been developed, which predicts the variation of temperature, humidity, and condensation rate through the condenser stages. Agreement between the model and experiments is very good. It is observed that the countercurrent flow stage condensation effectiveness is significantly higher than that for the co-current stage. The condensation heat and mass transfer rates were found to decrease when water blockages occur within the packed bed. Using high-speed digital cinematography, it was observed that this problem can occur at any operating condition, and is dependent on the packing surface wetting characteristics. This observation is used to explain the requirement for two different empirical constants, depending on packing diameter, suggested by Onda for the air side mass transfer coefficient correlation.
机译：最近描述了一种扩散驱动的脱盐方法，其中使用非常有效的带有填充床的直接接触冷凝器将水蒸气从空气/蒸气混合物中冷凝出来。实验室规模的直接接触式冷凝器已制成双塔结构，分为两个阶段，并流和逆流。在每个阶段均进行了实验，各自的饱和进气温度分别为36、40和43℃。在填充床的入口和出口已收集了温度和湿度数据，用于不同的水与空气质量流量比（介于0和2.5之间）。已经建立了基于守恒原理的一维模型，该模型可预测冷凝器级温度，湿度和冷凝速率的变化。模型与实验之间的一致性很好。观察到逆流阶段冷凝效率明显高于并流阶段。当填充床内发生水堵塞时，发现冷凝热和传质速率降低。使用高速数字电影摄影，已观察到此问题可能在任何操作条件下发生，并且取决于包装表面的润湿特性。该观察结果用于解释取决于填料直径的两个不同的经验常数的要求，这取决于昂达提出的空气侧传质系数的相关性。

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