Evaluation of heat and mass transfer coefficients in a gauze-type structured packing air dehumidifier operating with liquid desiccant
Evaluation of heat and mass transfer coefficients in a gauze-type structured packing air dehumidifier operating with liquid desiccant
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DOI：
10.1016/s0140-7007(01)00016-0
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发表时间：
2002-05
期刊：
影响因子：
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通讯作者：
A. Al-Farayedhi;P. Gandhidasan;M. A. Al-Mutairi
中科院分区：
文献类型：
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作者：
A. Al-Farayedhi;P. Gandhidasan;M. A. Al-Mutairi
本文提出了一种高性能填料，即具有良好传热传质特性的规整填料，用于液体干燥剂的空气净化和液体干燥剂的再生。为了设计用于液体干燥剂-空气接触操作的规整填料塔，需要每个相的传热和传质系数。本文研究了空气与溶液接触时的界面传热传质问题。本文研究了氯化钙、氯化锂和50%氯化钙和50%氯化锂混合溶液（简称CELD）在空气-干燥剂接触系统中的热质系数计算方法。此外，空气相转移系数与空气和液体的流速以及空气的温度相关，而液相系数与空气和液体的流速以及液体的温度和浓度相关。三种液体干燥剂的研究结果进行了比较和讨论。
In this paper, high performance packing, namely, structured packing that has good heat and mass transfer characteristics, is proposed for dehumidification of air using liquid desiccants and for regeneration of liquid desiccants. In order to design a structured packing tower for liquid desiccant — air contacting operations, heat and mass transfer coefficients for each phase are required. This paper is concerned with the interface transfer of heat and mass when air is brought into contact with the liquid desiccant solution. A theoretical study of evaluating heat and mass coefficients in an air-desiccant contact system employing three liquid desiccants, namely calcium chloride, lithium chloride, and a mixture of 50% calcium chloride and 50% lithium chloride (called cost effective liquid desiccant, CELD) is investigated. Moreover, air phase transfer coefficients are correlated with flow rates of air and liquid and the temperature of air, whereas liquid phase coefficients are correlated with rates of air and liquid flow, and the temperature and concentration of the liquid. The findings for the three liquid desiccants are compared and discussed.