Flow maldistribution and performance deteriorations in a counter flow hollow fiber membrane module for air humidification/dehumidification
Flow maldistribution and performance deteriorations in a counter flow hollow fiber membrane module for air humidification/dehumidification
复制标题
用于空气加湿/除湿的逆流中空纤维膜组件中的流量分布不均和性能恶化
DOI：
10.1016/j.ijheatmasstransfer.2014.03.047
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发表时间：
2014-07-01
影响因子：
5.2
通讯作者：
Zhang, Li-Zhi
中科院分区：
文献类型：
--
作者：
Li, Zhen-Xing;Zhang, Li-Zhi
研究了逆流式中空纤维膜组件在空气增湿或除湿过程中由于流场分布不均匀而引起的性能恶化。为了获得真实的流场，将纤维束视为多孔介质，利用CFD软件计算了整个膜组件内的流场分布。然后将该模块等效为一系列小型双管换热器。利用该微型双圆管模型研究了气流与水流之间的热湿耦合传递。在考虑管束内速度分布不均匀的情况下，计算了显冷效率和显湿效率。结果表明，填充率对流动不均匀性影响很大。随之而来的显着冷却和加湿效率显着恶化。取决于空气流速，显冷效率可降低17- 36%，增湿效率可降低21- 39%。(C)2014爱思唯尔有限公司版权所有。
Performance deterioration caused by flow maldistribution in a counter flow hollow fiber membrane module used for air humidification or dehumidification is investigated. To obtain the real flow fields, a CFD code is used to calculate the flow distribution in the whole membrane module, by treating the fiber bundle as a porous media. Then the module is equivalently transformed into a series of mini double-pipe heat and mass exchangers. Coupled heat and moisture transfer between the air flow and the water flow are studied with this mini double pipe model. The sensible cooling and humidification efficiencies are calculated with the maldistribution of velocities in the bundle. The results indicate that the packing fraction affects the flow maldistribution substantially. The consequent sensible cooling and humidification efficiencies deteriorate significantly. Depending on air flow rates, the sensible cooling efficiencies can be deteriorated by 17-36%, and the humidification efficiencies can be deteriorated by 21-39%. (C) 2014 Elsevier Ltd. All rights reserved.