Experimental study on dehumidification performance enhancement by TiO2superhydrophilic coating for liquid desiccant plate dehumidifiers

Chuanshuai Dong, Lin Lu, Tao Wen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)

Abstract

However, the incomplete wetting conditions of liquid desiccant deteriorates the dehumidification performance and limits the development. Therefore, how to enhance the surface wettability is critical to improving the dehumidification performance as well as reducing the building energy consumption. In this paper, a novel TiO2superhydrophilic coating was applied in a plate dehumidifier to enhance the surface wettability and improve the dehumidification performance. Firstly, the characterization of the coating was conducted. The test results showed the surface wettability was effectively improved with the contact angle dramatically decreasing from 84.6° to 8.8°. Then two single-channel internally-cooled liquid desiccant dehumidifiers were fabricated to investigate the effect of TiO2coating on dehumidification performance. The experimental results indicated that the dehumidification performance was significantly enhanced with the mean enhancing ratios of 1.60 and 1.63 for moisture removal rate and dehumidification efficiency, respectively. Besides, the influencing factors on dehumidification performance were analysed comprehensively. Based on the analysis, the new empirical correlations of mass transfer coefficients were developed with different contact angles. Lastly, the energy consumption of liquid desiccant air-conditioning system with coated dehumidifiers for a commercial building in Hong Kong was simulated and around 80MW⋅h of the electricity consumption could be saved. This study is helpful to researchers and engineers who are interested in enhancing the dehumidification performance and reducing the building energy consumption.
Original languageEnglish
Pages (from-to)219-231
Number of pages13
JournalBuilding and Environment
Volume124
DOIs
Publication statusPublished - 1 Nov 2017

Keywords

  • Dehumidification performance
  • Energy consumption
  • Incomplete wetting conditions
  • Liquid desiccant air dehumidification
  • Superhydrophilic coating

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Geography, Planning and Development
  • Building and Construction

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