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International Heat Transfer Conference 15

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Application of Entransy in Match Property of Liquid Desiccant Dehumidification

Lun Zhang
Tsinghua University

Xiaohua Liu
Department of Building Science, Tsinghua University; Dalian University of Technology, No.2 Linggong Road, Ganjingzi District, Dalian 116024, China

Yi Jiang
Department of Thermal engineering, Tsinghua University, Haidian District, Beijing 100084, China

DOI: 10.1615/IHTC15.mtr.009024
pages 5101-5111


KEY WORDS: Mass transfer and drying, Energy efficiency, Entransy, liquid desiccant

Abstract

Liquid desiccant dehumidification is an effective method for extracting moisture from humid air with less energy consumption than conventional vapor compression systems. The heat and mass transfer process between air and liquid desiccant is the key issue of liquid desiccant dehumidification. This paper examines heat and mass transfer process of liquid desiccant dehumidification system using entransy analysis. In heat and mass transfer process, the relative position of inlet parameters of air and solution in the psychrometric chart will influence entransy dissipation in packing tower under the condition of same moisture removal rate and NTUm. For different inlet parameter, minimum entransy dissipation exsits when the inlet states of air and solution are on the same isorelative humidity line. The influence of inlet parameter can be quantified by unmatched coefficient of inlet parameter (????), and flow path close to iso-relative humidity line is suggested. An application example is presented. Reducing entransy dissipation, or smaller ???? in the case, will decrease input of heat sources based on the entransy balance of the system. The unmatched coefficient of inlet parameter (????) is an indicator of flow path design and system optimization.

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