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Handling zone dividing method in packed bed liquid desiccant dehumidification/regeneration process

机译：填充床液体干燥剂除湿/再生过程中的处理区划分方法

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摘要

Dehumidifier and regenerator are the most significant components in liquid desiccant air-conditioning systems, in which air directly contacts liquid desiccant and heat and mass transfer process occurs between the two fluids. Heat transfer process and mass transfer process within dehumidifier/regenerator influence each other and should not be separately considered. Based on the previous reachable handling region analysis, a zonal method is proposed in present study. Four zones are divided in the psychrometric chart according to the relative position of inlet air to inlet desiccant including two dehumidification zones, zone A and zone D, and two regeneration zones, zone B and zone C. In zone A or C, mass transfer is key process, and counter-flow configuration has the best mass transfer performance and parallel-flow is the poorest in the same operating conditions. In zone B or D, heat transfer is governing process, parallel-flow has the best mass transfer performance and counter-flow is the poorest. In order to obtain better mass transfer performance, liquid desiccant should be cooled (in zone A) rather than air (in zone D) in dehumidifier, and liquid desiccant should be heated (in zone C) rather than air (in zone B) in regenerator. The divided zones and the corresponding zonal properties will be helpful to the design and optimization of dehumidifiers and regenerators.
机译：除湿器和蓄热器是液体干燥剂空调系统中最重要的组件，其中空气直接接触液体干燥剂，并且在两种流体之间发生热量和质量传递过程。除湿机/回热器内的传热过程和传质过程相互影响，因此不应分开考虑。在以前的可达处理区域分析的基础上，提出了一种分区方法。根据入口空气与入口干燥剂的相对位置，在干湿图中划分为四个区域，包括两个除湿区域A和D，以及两个再生区域B和C。在区域A或C中，传质为在关键条件下，逆流配置具有最佳的传质性能，而平行流在相同的工作条件下最差。在B区或D区，传热是主导过程，平行流传质性能最好，逆流传质最差。为了获得更好的传质性能，应在除湿机中冷却液体干燥剂（在A区），而不是冷却空气（在D区中）；在液体干燥剂中，应冷却液体干燥剂（在C区），而不是空气（在B区）。再生器。划分的区域和相应的区域特性将有助于除湿机和蓄热器的设计和优化。

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