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Effectiveness of heat and mass transfer in packed beds of liquid desiccant system

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

Abstract

A liquid desiccant system (using CaCl2) is presented for air dehumidification using solar energy or any other low grade energy to power the system. The system utilizes two packed beds of counterflow between an air stream and a solution of liquid desiccant for the processes of air dehumidification and solution regeneration. To simplify the prediction of the performance of the system an effectiveness of heat transfer and an effectiveness of mass transfer in the packed beds are defined. A finite difference model is developed to model the heat and mass transfer in packed beds during the air dehumidification mode and the solution regeneration mode. This finite difference model is used to calculate the effectiveness of heat and mass transfer in the packed beds at various bed heights, various air and solution flow rates, various inlet temperatures of air and solution to the bed, and various concentrations of CaCl2 solution at the bed entrance. Charts of the effectiveness of heat and mass transfer are presented in a convenient form. A designer of a liquid desiccant system may use the charts in predicting the performance of these systems without having to use the finite difference model for this purpose.

Suggested Citation

  • Elsayed, M.M. & Gari, H.N. & Radhwan, A.M., 1993. "Effectiveness of heat and mass transfer in packed beds of liquid desiccant system," Renewable Energy, Elsevier, vol. 3(6), pages 661-668.
    • Handle: RePEc:eee:renene:v:3:y:1993:i:6:p:661-668
    DOI: 10.1016/0960-1481(93)90073-P
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    Cited by:

    1. Elsayed, Moustafa M., 1994. "Analysis of air dehumidification using liquid desiccant system," Renewable Energy, Elsevier, vol. 4(5), pages 519-528.
    2. 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.
    3. Shukla, Dhruvin L. & Modi, Kalpesh V., 2017. "A technical review on regeneration of liquid desiccant using solar energy," Renewable and Sustainable Energy Reviews, Elsevier, vol. 78(C), pages 517-529.
    4. 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.
    5. Luo, Yimo & Yang, Hongxing & Lu, Lin & Qi, Ronghui, 2014. "A review of the mathematical models for predicting the heat and mass transfer process in the liquid desiccant dehumidifier," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 587-599.
    6. Kabeel, A.E., 2010. "Dehumidification and humidification process of desiccant solution by air injection," Energy, Elsevier, vol. 35(12), pages 5192-5201.
    7. 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.
    8. 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.
    9. Mei, L. & Dai, Y.J., 2008. "A technical review on use of liquid-desiccant dehumidification for air-conditioning application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(3), pages 662-689, April.

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