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Parametric study of a packed bed dehumidifier/regenerator using CaCl2 liquid desiccant

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  • Radhwan, A.M.
  • Gari, H.N.
  • Elsayed, M.M.

Abstract

The processes occurring in a packed bed dehumidifier, which is part of a liquid desiccant solar cooling system, are mathematically simulated. The air flows in a counter flow direction to the liquid desiccant (CaCl2). The effect of varying the air, liquid flow rates and bed geometry are studied in addition to studying the effect due to varying the air and liquid desiccant inlet coditions. The inlet temperature of the liquid desiccant during the air dehumidification process has a strong effect on the other parameters, while the air inlet temperature has a negligible effect. It is also noticed that higher temperatures of air and while the air inlet temperature has a negligible effect. It is also noticed that higher temperatures of air and liquid desiccant enhance the liquid desiccant regeneration processes but by different ratios. The study showed that both the air and liquid desiccant flow rates have negligible effect on the bed exit humidity ratio of air whereas the liquid flow rate has a strong effect on the bed exit moisture content of the liquid. It is also observed that increasing the air flow rate enhances the liquid desiccant regeneration (air humidification) process. Regardless of the inlet moisture content of the liquid desiccant, it is found that as the product (LAs) gets larger, the exit air humidity gets less.

Suggested Citation

  • Radhwan, A.M. & Gari, H.N. & Elsayed, M.M., 1993. "Parametric study of a packed bed dehumidifier/regenerator using CaCl2 liquid desiccant," Renewable Energy, Elsevier, vol. 3(1), pages 49-60.
    • Handle: RePEc:eee:renene:v:3:y:1993:i:1:p:49-60
    DOI: 10.1016/0960-1481(93)90130-9
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    Cited by:

    1. Abdel-Salam, Mohamed R.H. & Ge, Gaoming & Fauchoux, Melanie & Besant, Robert W. & Simonson, Carey J., 2014. "State-of-the-art in liquid-to-air membrane energy exchangers (LAMEEs): A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 39(C), pages 700-728.
    2. Rahamah, A. & Elsayed, M.M. & Al-Najem, N.M., 1998. "A numerical solution for cooling and dehumidification of air by a falling desiccant film in parallel flow," Renewable Energy, Elsevier, vol. 13(3), pages 305-322.
    3. 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.
    4. Elsayed, Moustafa M., 1994. "Analysis of air dehumidification using liquid desiccant system," Renewable Energy, Elsevier, vol. 4(5), pages 519-528.
    5. Rafique, M. Mujahid & Gandhidasan, P. & Bahaidarah, Haitham M.S., 2016. "Liquid desiccant materials and dehumidifiers – A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 179-195.
    6. Ali, Ameer & Ishaque, Kashif & Lashin, Aref & Al Arifi, Nassir, 2017. "Modeling of a liquid desiccant dehumidification system for close type greenhouse cultivation," Energy, Elsevier, vol. 118(C), pages 578-589.
    7. Fekadu, Geleta & Subudhi, Sudhakar, 2018. "Renewable energy for liquid desiccants air conditioning system: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 93(C), pages 364-379.
    8. Abdel-Salam, Ahmed H. & Simonson, Carey J., 2016. "State-of-the-art in liquid desiccant air conditioning equipment and systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 58(C), pages 1152-1183.
    9. Audah, N. & Ghaddar, N. & Ghali, K., 2011. "Optimized solar-powered liquid desiccant system to supply building fresh water and cooling needs," Applied Energy, Elsevier, vol. 88(11), pages 3726-3736.
    10. Enteria, Napoleon & Yoshino, Hiroshi & Mochida, Akashi, 2013. "Review of the advances in open-cycle absorption air-conditioning systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 28(C), pages 265-289.
    11. Kumar, Ritunesh & Dhar, P.L. & Jain, Sanjeev, 2011. "Development of new wire mesh packings for improving the performance of zero carryover spray tower," Energy, Elsevier, vol. 36(2), pages 1362-1374.

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