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A numerical solution for cooling and dehumidification of air by a falling desiccant film in parallel flow

Author

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  • Rahamah, A.
  • Elsayed, M.M.
  • Al-Najem, N.M.

Abstract

The heat and mass transfer process between falling liquid desiccant film and air in parallel flow heat exchanger is investigated numerically. The governing equations with appropriate boundary and interfacial conditions describing the physical problem are derived. The control volume approach is used to predict the outlet conditions for both the air and the desiccant solution. The effect of inlet conditions, mass flow rates and channel geometry on the air cooling and dehumidification processes is also predicted. The average Nusselt and Sherwood numbers for air flow are correlated in terms of Prandtl number, Schmidt number and channel geometry. Typical numerical experiments showed good agreement of the present results with the available data in literature. Moreover, a parametric study is conducted to illustrate the general effects of various variables on heat and mass transfer processes in cooling and dehumidification of air.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:13:y:1998:i:3:p:305-322
    DOI: 10.1016/S0960-1481(98)00008-1
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    References listed on IDEAS

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    1. 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.
    2. Elsayed, Moustafa M., 1994. "Analysis of air dehumidification using liquid desiccant system," Renewable Energy, Elsevier, vol. 4(5), pages 519-528.
    3. 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.
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    Cited by:

    1. 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.
    2. Kabeel, A.E., 2010. "Dehumidification and humidification process of desiccant solution by air injection," Energy, Elsevier, vol. 35(12), pages 5192-5201.
    3. 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.
    4. 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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