Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

A Proposal for New Definition of Performance Indices of a Desiccant Rotor

제습로터 성능지료 제안

  • Lee, Dea-Young (Korea Institute of Science and Technology) ;
  • Lee, Gil-Bong (Department of Mechanical & Aerospace Engineering, Seoul National University) ;
  • Kim, Min-Soo (Department of Mechanical & Aerospace Engineering, Seoul National University)
  • 이대영 (한국과학기술연구원) ;
  • 이길봉 (서울대학교 기계항공공학부) ;
  • 김민수 (서울대학교 기계항공공학부)
  • Published : 2007.07.10
Download PDF
⟨ Previous Next ⟩

Abstract

To facilitate comparative analysis on the effects of numerous parameters concerning design and operation of a desiccant rotor, it is firstly required to represent the dehumidification performance as numerical indices. In this work is proposed two performance indices of a desiccant rotor: the humidity effectiveness and the enthalpy-leak ratio. The humidity effectiveness represents the actual dehumidification as compared with the dehumidification in an ideal case, while the enthalpy-leak ratio represents the enthalpy transfer from the regeneration side to the dehumidification side. In an ideal case, the two indices approach one and zero, respectively. The effects of numerous parameters on the dehumidification performance of a desiccant rotor are investigated through numerical simulation and represented with the two indices. The results show that the performance indices are mainly determined by three nondimensional parameters each representing the thermal capacity, the sorption capacity, and the transfer capacity of a desiccant rotor.

Keywords

References

  1. Banks, P.J., 1985, Prediction of heat and mass regenerator performance using nonlinear analogy method: Part 2-Comparison of methods, Trans. ASME, J. Heat Transfer, Vol.107, pp. 230-238 https://doi.org/10.1115/1.3247383
  2. Neti, S. and Wolfe., E.I., 2000, Measurements of effectiveness in a silica gel rotary exchanger, Applied Thermal Engineering, Vol. 20, pp. 309-322 https://doi.org/10.1016/S1359-4311(99)00031-9
  3. Joudi, K. A., and Dhaidan, N. S., 2001, Application of solar heating and desiccant cooling system for a domestic building, Energy Conversion and Management, Vol. 42, pp. 995-1022 https://doi.org/10.1016/S0196-8904(00)00111-4
  4. Zhang, L. Z., and Niu, J. L., 2003, A precooling Munters environmental control desiccant cooling cycle in combination with chilled-ceiling panels, Energy, Vol. 28, pp. 275-292 https://doi.org/10.1016/S0360-5442(02)00114-7
  5. Zhang, L. Z. and Niu, J. L., 2002, Performance comparisons of desiccant wheels for air dehumidification and enthalpy recovery, Applied Thermal Engineering, Vol. 22, pp. 1347-1367 https://doi.org/10.1016/S1359-4311(02)00050-9
  6. Ahmed, M. H., Kattab, N. M., and Fouad, M., 2005, Evaluation and optimization of solar desiccant wheel performance, Renewable Energy, Vol. 30, pp. 305-325 https://doi.org/10.1016/j.renene.2004.04.010
  7. Daou, K., Wang, R. Z., and Xia, Z. Z. 2006, Desiccant cooling air conditioning: a review, Renewable & Sustainable Energy Reviews, Vol. 10, pp. 55-77 https://doi.org/10.1016/j.rser.2004.09.010
  8. Zheng, W., Worek, W. M., and Novosel, D., 1995, Performance optimization of rotary dehumidifiers Trans. ASME, J. Solar Energy Engineering, Vol. 117, pp. 40-44 https://doi.org/10.1115/1.2847724
  9. Majumdar, P., 1998, Heat and mass transfer in composite desiccant pore structures for dehumidification, Solar Energy, Vol. 62, pp. 1-10 https://doi.org/10.1016/S0038-092X(97)00080-7
  10. Kodama, A., Hirayama, T., Goto, M., Hirose, T., and Critoph, R. E., 2001, The use of psychrometric charts for the optimisation of a thermal swing desiccant wheel, Applied Thermal Engineering, Vol.21, pp. 1657-1674 https://doi.org/10.1016/S1359-4311(01)00032-1
  11. Cejudo, J. M., Moreno, R., and Carrillo, A., 2002, Physical and neural network models of a silica-gel desiccant wheel, Energy and Buildings, Vol. 34, pp. 837-844 https://doi.org/10.1016/S0378-7788(02)00100-7
  12. Jia, C. X., Dai, Y.J., Wu, J. Y., and Wang, R. Z., 2006, Experimental comparison of two honeycombed desiccant wheels fabricated with silica gel and composite desiccant material, Energy Conversion and Management, Vol. 47, pp. 2523-2534 https://doi.org/10.1016/j.enconman.2005.10.034
  13. Zheng, W. and Worek, W. M., 1993, Numerical simulation of combined heat and mass transfer process in a rotary dehumidifier, Numerical Heat Transfer, Part A, Vol. 23, pp. 211-232 https://doi.org/10.1080/10407789308913669
  14. Lee, G., Lee, D.-Y. and Kim, M. S., 2004, Development of a linearized model and verification of the exact solution for the analysis of a desiccant dehumidifier, Korean J. Air-Conditioning and Refrigeration Engineering, Vo!. 16, No. 9, pp. 811-819
  15. Lee, G., Kim, M. S., and Lee, D. - Y., 2005, Derivation and analysis of deimensionless parameters dominating the dehumidification characteristics of a desiccant rotor, Korean J. Air-Conditioning and Refrigeration Engineering, Vol.17, No. 7, pp. 611-619