Haze particles removal and thermally induced membrane dehumidification system

Baiwang Zhao, Wai Fen Yong, Tai-Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Air conditioning systems consume a large portion of energy to remove the latent heat of moisture to reach the indoor comfort level in Southeast Asia due to the high relative humidity. The worsening air pollution causes significant health concerns in recent years. Therefore, an efficient strategy to simultaneously remove both haze particles and excess humidity is very important, particularly for large buildings. In this study, a thermally induced membrane dehumidification system was established by using waste energy to create a partial pressure difference of water vapor across the membrane to reduce the excess humidity. A pilot scale system test showed that the removal of water vapor was a function of hot plate temperature and up to 12.4% of water vapor could be effectively removed by using a merely 0.55 m2 polytetrafluoroethylene - polydimethylsiloxane (PTFE-PDMS) flat membrane with the aid of an air blower at a pressure of 8.54 mbar. As a result, the inlet air with a water vapor concentration of 24.3 ± 0.5 g/m3 dropped to 21.3 ± 0.5 g/m3 after the dehumidification. The calculated energy saving in this dehumidification process was about 10.8% with ΔE = 93.0 kJ/h. In addition, the newly developed stacked polypropylene - polydimethylsiloxane (PP-PDMS) filter showed the particle removal efficiency up to 98.2% with a very minimal pressure loss of 0.18 mbar.

Original languageEnglish (US)
Pages (from-to)24-32
Number of pages9
JournalSeparation and Purification Technology
Volume185
DOIs
StatePublished - Jan 1 2017

Keywords

  • Flat PTFE membrane
  • Haze particles removal
  • PDMS coating
  • PP non-woven
  • Thermally induced membrane dehumidification

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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