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Performance analysis of a direct expansion air dehumidification system combined with membrane-based total heat recovery

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  • Liang, Cai-Hang
  • Zhang, Li-Zhi
  • Pei, Li-Xia

Abstract

A direct expansion (DX) air dehumidification system is an efficient way to supply fresh and dry air to a built environment. It plays a key role in preventing the spread of respiratory disease like Swine flu (H1N1). To improve the efficiency of a conventional DX system in hot and humid regions, a new system of DX in combination with a membrane-based total heat exchanger is proposed. Air is supplied with dew points. A detailed mathematical modeling is performed. A cell-by-cell simulation technique is used to simulate its performances. A real prototype is built in our laboratory in South China University of Technology to validate the model. The effects of inlet air humidity and temperature, evaporator and condenser sizes on the system performance are investigated. The results indicate that the model can predict the system accurately. Compared to a conventional DX system, the air dehumidification rate (ADR) of the novel system is 0.5 times higher, and the coefficient of performance (COP) is 1 times higher. Furthermore, the system performs well even under harsh hot and humid weather conditions.

Suggested Citation

  • Liang, Cai-Hang & Zhang, Li-Zhi & Pei, Li-Xia, 2010. "Performance analysis of a direct expansion air dehumidification system combined with membrane-based total heat recovery," Energy, Elsevier, vol. 35(9), pages 3891-3901.
    • Handle: RePEc:eee:energy:v:35:y:2010:i:9:p:3891-3901
    DOI: 10.1016/j.energy.2010.06.002
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    References listed on IDEAS

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    Citations

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    Cited by:

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    5. Ge, Gaoming & Abdel-Salam, Mohamed R.H. & Besant, Robert W. & Simonson, Carey J., 2013. "Research and applications of liquid-to-air membrane energy exchangers in building HVAC systems at University of Saskatchewan: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 26(C), pages 464-479.
    6. Huang, Si-Min & Zhang, Li-Zhi, 2013. "Researches and trends in membrane-based liquid desiccant air dehumidification," Renewable and Sustainable Energy Reviews, Elsevier, vol. 28(C), pages 425-440.
    7. Abdel-Salam, Mohamed R.H. & Fauchoux, Melanie & Ge, Gaoming & Besant, Robert W. & Simonson, Carey J., 2014. "Expected energy and economic benefits, and environmental impacts for liquid-to-air membrane energy exchangers (LAMEEs) in HVAC systems: A review," Applied Energy, Elsevier, vol. 127(C), pages 202-218.
    8. Ge, Gaoming & Xiao, Fu & Xu, Xinhua, 2011. "Model-based optimal control of a dedicated outdoor air-chilled ceiling system using liquid desiccant and membrane-based total heat recovery," Applied Energy, Elsevier, vol. 88(11), pages 4180-4190.
    9. Zhang, Li-Zhi & Zhang, Ning, 2014. "A heat pump driven and hollow fiber membrane-based liquid desiccant air dehumidification system: Modeling and experimental validation," Energy, Elsevier, vol. 65(C), pages 441-451.
    10. Mardiana-Idayu, A. & Riffat, S.B., 2012. "Review on heat recovery technologies for building applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(2), pages 1241-1255.
    11. Zhang, Ning & Yin, Shao-You & Zhang, Li-Zhi, 2016. "Performance study of a heat pump driven and hollow fiber membrane-based two-stage liquid desiccant air dehumidification system," Applied Energy, Elsevier, vol. 179(C), pages 727-737.
    12. Zhang, Li-Zhi & Fu, Huang-Xi & Yang, Qi-Rong & Xu, Jian-Chang, 2014. "Performance comparisons of honeycomb-type adsorbent beds (wheels) for air dehumidification with various desiccant wall materials," Energy, Elsevier, vol. 65(C), pages 430-440.
    13. Zhang, Zi-Yang & Cao, Xiang & Yang, Zhi & Shao, Liang-Liang & Zhang, Chun-Lu, 2019. "Modeling and experimental investigation of an advanced direct-expansion outdoor air dehumidification system," Applied Energy, Elsevier, vol. 242(C), pages 1600-1612.

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