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Solution-side effectiveness for a liquid-to-air membrane energy exchanger used as a dehumidifier/regenerator

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  • Ghadiri Moghaddam, Davood
  • Besant, Robert W.
  • Simonson, Carey J.

Abstract

A liquid-to-air membrane energy exchanger (LAMEE) is an energy exchange device that transfers heat and moisture between air and salt solution streams through a semi-permeable membrane which is permeable for water vapor but impermeable for liquid water. LAMEEs have been used as a dehumidifier/regenerator in air-conditioning systems. In this paper, the solution-side effectiveness are presented for a small-scale single-panel LAMEE when it is used to regenerate the solution flow. The solution-side effectiveness are very important in regenerators where the main focus is on the salt solution, and the solution properties (i.e. solution outlet concentration) are important. The small-scale LAMEE is tested under air dehumidification and solution regeneration test conditions using a LiCl solution at one NTU (i.e. NTU=5) and three different Cr∗ values (Cr∗=2, 4 and 6). The results show that both the air-side and solution-side effectiveness of the LAMEE increase with Cr∗. The solution-side latent effectiveness is lower for the regenerator in comparison to the dehumidifier (e.g. 43% lower at Cr∗=6). Also, the numerical results for a small-scale LAMEE which were presented in literature are used in this paper to evaluate the solution-side effectiveness of the LAMEE under different test conditions. The numerical results show that the difference between the air-side and solution-side latent effectiveness are negligible. Therefore, the air-side latent effectiveness can be used to evaluate the solution-side latent effectiveness of LAMEEs.

Suggested Citation

  • Ghadiri Moghaddam, Davood & Besant, Robert W. & Simonson, Carey J., 2014. "Solution-side effectiveness for a liquid-to-air membrane energy exchanger used as a dehumidifier/regenerator," Applied Energy, Elsevier, vol. 113(C), pages 872-882.
    • Handle: RePEc:eee:appene:v:113:y:2014:i:c:p:872-882
    DOI: 10.1016/j.apenergy.2013.08.037
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    References listed on IDEAS

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    1. Liu, X.H. & Jiang, Y. & Chang, X.M. & Yi, X.Q., 2007. "Experimental investigation of the heat and mass transfer between air and liquid desiccant in a cross-flow regenerator," Renewable Energy, Elsevier, vol. 32(10), pages 1623-1636.
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    2. 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.
    3. Abdel-Salam, Ahmed H. & Simonson, Carey J., 2014. "Annual evaluation of energy, environmental and economic performances of a membrane liquid desiccant air conditioning system with/without ERV," Applied Energy, Elsevier, vol. 116(C), pages 134-148.
    4. Chen, Q. & Kum Ja, M. & Li, Y. & Chua, K.J., 2018. "Thermodynamic optimization of a vacuum multi-effect membrane distillation system for liquid desiccant regeneration," Applied Energy, Elsevier, vol. 230(C), pages 960-973.
    5. Zhang, Ning & Yin, Shao-You & Li, Min, 2018. "Model-based optimization for a heat pump driven and hollow fiber membrane hybrid two-stage liquid desiccant air dehumidification system," Applied Energy, Elsevier, vol. 228(C), pages 12-20.
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    8. Bai, Hongyu & Zhu, Jie & Chen, Xiangjie & Chu, Junze & Cui, Yuanlong & Yan, Yuying, 2020. "Steady-state performance evaluation and energy assessment of a complete membrane-based liquid desiccant dehumidification system," Applied Energy, Elsevier, vol. 258(C).
    9. Yon, Hao Ren & Cai, Wenjian & Wang, Youyi & Shen, Suping, 2018. "Performance investigation on a novel liquid desiccant regeneration system operating in vacuum condition," Applied Energy, Elsevier, vol. 211(C), pages 249-258.
    10. Liu, Xiaoli & Qu, Ming & Liu, Xiaobing & Wang, Lingshi, 2019. "Membrane-based liquid desiccant air dehumidification: A comprehensive review on materials, components, systems and performances," Renewable and Sustainable Energy Reviews, Elsevier, vol. 110(C), pages 444-466.
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