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首页> 外文期刊>International Journal of Refrigeration >Transient performance of coupled heat and mass transfer in cross-flow hollow fiber membrane module for air dehumidification
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Transient performance of coupled heat and mass transfer in cross-flow hollow fiber membrane module for air dehumidification

机译：横流中空纤维膜模块耦合热量和传质的瞬态性能，用于空气除湿

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摘要

Membrane-based liquid desiccant dehumidification has great advantages over traditional method, particularly in avoiding liquid droplets moving into the process air. This paper proposes a simple model to predict the transient performance of the hollow fiber membrane-based dehumidification module. To simplify the fiber-to-fiber influence, the modeled membrane module is assumed to be a parallel-plates heat mass exchanger. The model has been calibrated and validated with a transient experiment reasonably well. Impacts of various parameters on the transient performance were studied by using the proposed model. The results show that the variation of air temperature is more significant than air humidity. The absorption heat of water vapor is the main resistance of heat and mass transfer. It initially restricts the growth of the cooling effectiveness, and then limits the driving potential for moisture transfer. Therefore, it brings the dehumidification effectiveness down. It is found that reducing the heat capacity rate ratio can reduce the equilibrium time, and increase the cooling and dehumidification effectiveness. The high packing density increases the dehumidification effectiveness with a negligible effect of somewhat drop in cooling effectiveness. By contrast, the geometry of the fiber packing arrangement has little influence on dynamic performance of the module formed by numerous fibers. The membrane module can fit the change of weather conditions by varying solution temperature on the inlet of the dehumidifier with the help of this dynamic model. The cooling and dehumidification effectiveness also increase to improve heat and mass transfer performance of the dehumidifier under the adjustment. (C) 2019 Elsevier Ltd and IIR. All rights reserved.
机译：基于膜的液体干燥剂除湿性具有与传统方法相比具有很大的优势，特别是在避免进入工艺空气中的液滴。本文提出了一种简单的模型，以预测基于中空纤维膜的除湿模块的瞬态性能。为了简化纤维到纤维的影响，假设建模膜模块是平行板热质量交换器。该模型已被校准并通过瞬态实验进行验证。通过使用所提出的模型研究了各种参数对瞬态性能的影响。结果表明，空气温度的变化比空气湿度更大。水蒸气的吸收热是热和传质的主要电阻。它最初限制了冷却效果的生长，然后限制了水分转移的驾驶潜力。因此，它带来了除湿效果。发现降低热容率比可以降低平衡时间，并提高冷却和除湿效果。高填充密度增加了除湿效果，略微降低了冷却效果的效果。相比之下，光纤包装装置的几何形状对由许多纤维形成的模块的动态性能影响不大。膜组件可以通过在这种动态模型的帮助下改变除湿器的入口处的溶液温度来符合天气条件的变化。冷却和除湿效果也增加，以改善调整下除湿器的热量和传质性能。 （c）2019年Elsevier Ltd和IIR。版权所有。

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