Abstract
A mathematical model is developed using the Matlab/Simulink platform to investigate heat and mass transfer performance of cross-flow and counterflow dehumidifiers with Lithium Chloride (LiCl) solution. In the liquid desiccant dehumidifier, the orthogonal polynomial basis is used to simulate the combined processes of heat and mass transfer. The temperature profiles on cross-flow and countercurrent flow dehumidifiers are demonstrated. The resultant counter flow air changes the temperature profile of the LiCl solution in the longitudinal direction because of the drag forces. In addition, when inlet airflow rate reaches 15 kg·s−1, the temperature effect becomes less obvious and may be reasonably negligible. Under these conditions, the air changes the design factor and determines the interfacial temperature. It is demonstrated that the mathematical model can be of great value in the design and improvement of cross-flow and countercurrent flow dehumidifiers.
Highlights
The liquid-desiccant air-conditioning (LDAC) system offers the advantage of removing the latent load and various pollutants from the air simultaneously, and has been long accepted [1,2]
The objective in this study is to develop a mathematical model that can be used to advance the design and performance improvement of cross-flow and countercurrent flow dehumidifier, using lithium chloride (LiCl) solution as the liquid desiccant
We present a theoretical analysis of the heat and mass transfer between the air and desiccant within cross-flow and countercurrent flow dehumidifiers, using two-dimensional orthogonal collocation
Summary
The liquid-desiccant air-conditioning (LDAC) system offers the advantage of removing the latent load and various pollutants from the air simultaneously, and has been long accepted [1,2]. Bassuoni [14] designed and experimentally used Calcium Chloride (CaCl2) solution desiccant and tested a packing structural cross-flow desiccant dehumidification system They found that an increase in the air and desiccant flowrates increases the moisture removal rate and mass transfer coefficient of the dehumidifier/regenerator. Abdel-Salam et al [33] proposed a numerical model to show the effects of air and desiccant solution channel widths on the performance of a two-fluid flat-plate LAMEE when used as supply air dehumidifier and a diluted desiccant solution regenerator. The objective in this study is to develop a mathematical model that can be used to advance the design and performance improvement of cross-flow and countercurrent flow dehumidifier, using LiCl solution as the liquid desiccant.
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