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Introduction of a new definition for effectiveness of desiccant wheels

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  • Ali Mandegari, M.
  • Pahlavanzadeh, H.

Abstract

In common air conditioning methods, both sensible and latent loads are handled by cooling systems. Utilizing desiccant, individual cooling and dehumidification processes are possible. In this paper, desiccant wheel operation has been investigated by experimental study. Experimental conditions include different climates (hot dry and hot humid) at different operating parameters (regeneration temperature and wheel speed). Due to the temperature and humidity measurements of inlet and outlet streams, the desiccant wheel efficiency in each definition was calculated. All experiments show that enthalpy of the outlet process air is notably higher than that of the inlet air. This event leads to a novel efficiency definition which presents the deviation of the outlet process air enthalpy from the inlet air enthalpy. By increase in the dehumidification efficiency, the adiabatic efficiency decreases, whereas it increases by the regeneration efficiency. Hence in some situations the adiabatic efficiency will have an optimum value. According to the adiabatic efficiency concept, it seems to be related to the coefficient of performance of the desiccant cooling systems.

Suggested Citation

  • Ali Mandegari, M. & Pahlavanzadeh, H., 2009. "Introduction of a new definition for effectiveness of desiccant wheels," Energy, Elsevier, vol. 34(6), pages 797-803.
    • Handle: RePEc:eee:energy:v:34:y:2009:i:6:p:797-803
    DOI: 10.1016/j.energy.2009.03.001
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    Cited by:

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    4. Kang, Hyungmook & Lee, Dae-Young, 2017. "Experimental investigation and introduction of a similarity parameter for characterizing the heat and mass transfer in polymer desiccant wheels," Energy, Elsevier, vol. 120(C), pages 705-717.
    5. Misha, S. & Mat, S. & Ruslan, M.H. & Sopian, K., 2012. "Review of solid/liquid desiccant in the drying applications and its regeneration methods," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(7), pages 4686-4707.
    6. Chung, Jun Yeob & Park, Myeong Hyeon & Hong, Seong Ho & Baek, Jaehyun & Han, Changho & Lee, Sewon & Kang, Yong Tae & Kim, Yongchan, 2023. "Comparative performance evaluation of multi-objective optimized desiccant wheels coated with MIL-100 (Fe) and silica gel composite," Energy, Elsevier, vol. 283(C).
    7. Angrisani, Giovanni & Roselli, Carlo & Sasso, Maurizio, 2013. "Effect of rotational speed on the performances of a desiccant wheel," Applied Energy, Elsevier, vol. 104(C), pages 268-275.
    8. Rambhad, Kishor S. & Walke, Pramod V. & Tidke, D.J., 2016. "Solid desiccant dehumidification and regeneration methods—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 59(C), pages 73-83.
    9. Ge, T.S. & Dai, Y.J. & Wang, R.Z. & Peng, Z.Z., 2010. "Experimental comparison and analysis on silica gel and polymer coated fin-tube heat exchangers," Energy, Elsevier, vol. 35(7), pages 2893-2900.
    10. Angrisani, Giovanni & Minichiello, Francesco & Roselli, Carlo & Sasso, Maurizio, 2012. "Experimental analysis on the dehumidification and thermal performance of a desiccant wheel," Applied Energy, Elsevier, vol. 92(C), pages 563-572.
    11. Husham Abdulmalek, Shaymaa & Khalaji Assadi, Morteza & Al-Kayiem, Hussain H. & Gitan, Ali Ahmed, 2018. "A comparative analysis on the uniformity enhancement methods of solar thermal drying," Energy, Elsevier, vol. 148(C), pages 1103-1115.
    12. Win-Jet Luo & Dini Faridah & Fikri Rahmat Fasya & Yu-Sheng Chen & Fikri Hizbul Mulki & Utami Nuri Adilah, 2019. "Performance Enhancement of Hybrid Solid Desiccant Cooling Systems by Integrating Solar Water Collectors in Taiwan," Energies, MDPI, vol. 12(18), pages 1-18, September.
    13. Nóbrega, C.E.L. & Brum, N.C.L., 2011. "A graphical procedure for desiccant cooling cycle design," Energy, Elsevier, vol. 36(3), pages 1564-1570.
    14. Angrisani, Giovanni & Capozzoli, Alfonso & Minichiello, Francesco & Roselli, Carlo & Sasso, Maurizio, 2011. "Desiccant wheel regenerated by thermal energy from a microcogenerator: Experimental assessment of the performances," Applied Energy, Elsevier, vol. 88(4), pages 1354-1365, April.
    15. Shahvari, Saba Zakeri & Clark, Jordan D., 2023. "Approaching theoretical maximum energy performance for desiccant dehumidification using staged and optimized metal-organic frameworks," Applied Energy, Elsevier, vol. 331(C).
    16. Zheng, X. & Ge, T.S. & Wang, R.Z., 2014. "Recent progress on desiccant materials for solid desiccant cooling systems," Energy, Elsevier, vol. 74(C), pages 280-294.
    17. Feng, Y.H. & Dai, Y.J. & Wang, R.Z. & Ge, T.S., 2022. "Insights into desiccant-based internally-cooled dehumidification using porous sorbents: From a modeling viewpoint," Applied Energy, Elsevier, vol. 311(C).

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