Experimental and 4NTU-Le heat and mass transfer model theoretical analysis based on a novel internally cooled liquid desiccant dehumidifier

Guangkai Zhang, Jingjie Tan, Jingchao Xie, Boyao Du, Honggang Liu and Jiaping Liu

Energy, 2024, vol. 313, issue C

Abstract: A microchannel flat tube-rectangular corrugated fin type new internally cooled liquid desiccant dehumidifier (NIC-D) was designed. It was found that the existing NTU-Le heat and mass transfer model is not well adapted to its physical phenomena. To respond to the study gap, this study proposed a new 4NTU-Le heat and mass transfer model based on the physical characteristics of NIC-D in the dehumidification process. Through theoretical derivation and experimental verification, the heat and mass transfer process between air, liquid desiccant and cooling water was analyzed, and the heat and mass transfer mechanism among the three fluids was deeply revealed. On this basis, a new method for calculating heat and mass transfer coefficients was given in combination with the model, which was more adapted to the calculation of the 4NTU-Le model in terms of concept. In addition, this method summarized the correlation between heat and mass transfer from experimental data to predict and characterize the performance of the NIC-D dehumidification process. The results show that the 4NTU-Le mathematical model, the new method for calculating heat and mass transfer coefficients, has high accuracy, in addition to the applicability of the Nu and Sh correlations. According to the analytical results of the validation experiments, the errors between the calculated and experimental values of air outlet temperature, liquid desiccant outlet temperature, cooling water outlet temperature, and air outlet humidity content are within 8.0 %, 15.0 %, 10.0 %, and 10.0 %, respectively, and the absolute average errors AAD are 1.73 %, 6.35 %, 1.46 %, and 3.18 %, respectively. Decreasing the temperature of imported liquid desiccant is a valuable way to improve dehumidification efficiency and energy effectiveness. For every 1.0 °C reduction in the temperature of imported liquid desiccant, the dehumidification efficiency and energy effectiveness increased by 2.6 % and 1.1 %, respectively.

Keywords: Heat and mass transfer; Dehumidification; Model; Liquid desiccant; Internal cooling (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:313:y:2024:i:c:s0360544224038313

DOI: 10.1016/j.energy.2024.134053

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