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Effect of ambient conditions on the first and second law performance of an open desiccant cooling process

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  • Kanoğlu, Mehmet
  • Bolattürk, Ali
  • Altuntop, Necdet

Abstract

An open desiccant cooling process is presented and applied to ventilation and recirculation modes of the system operation. The cooling system consists of a desiccant wheel, a rotary regenerator, two evaporative coolers, and a heating unit. Certain ideal operating characteristics based primarily on the first law of thermodynamics are assumed for each component. The system with indoor and outdoor ARI conditions has a thermal coefficient of performance (COP) of 1.17 in ventilation mode and 1.28 in recirculation mode. A second law analysis is also performed and at ARI conditions, the reversible COP of the system is determined to be 2.63 in ventilation mode and 3.04 in recirculation mode. Variation of the first and second law based COP terms and cooling load with respect to ambient temperature and relative humidity are investigated in both modes of the system operation. The results of the analysis provide an upper limit for the system performance at various ambient conditions and may serve as a model to which actual desiccant cooling systems may be compared. As an additional study, a non-ideal system operation is considered and it is determined that both the COP and cooling load decrease with increasing ambient temperature and relative humidity, and they approach zero at high values of ambient temperature and humidity.

Suggested Citation

  • Kanoğlu, Mehmet & Bolattürk, Ali & Altuntop, Necdet, 2007. "Effect of ambient conditions on the first and second law performance of an open desiccant cooling process," Renewable Energy, Elsevier, vol. 32(6), pages 931-946.
    • Handle: RePEc:eee:renene:v:32:y:2007:i:6:p:931-946
    DOI: 10.1016/j.renene.2006.04.001
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    Cited by:

    1. Eicker, Ursula & Schneider, Dietrich & Schumacher, Jürgen & Ge, Tianshu & Dai, Yanjun, 2010. "Operational experiences with solar air collector driven desiccant cooling systems," Applied Energy, Elsevier, vol. 87(12), pages 3735-3747, December.
    2. Yin, Yonggao & Qian, Junfei & Zhang, Xiaosong, 2014. "Recent advancements in liquid desiccant dehumidification technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 31(C), pages 38-52.
    3. La, D. & Li, Y. & Dai, Y.J. & Ge, T.S. & Wang, R.Z., 2012. "Development of a novel rotary desiccant cooling cycle with isothermal dehumidification and regenerative evaporative cooling using thermodynamic analysis method," Energy, Elsevier, vol. 44(1), pages 778-791.
    4. La, D. & Dai, Y.J. & Li, Y. & Wang, R.Z. & Ge, T.S., 2010. "Technical development of rotary desiccant dehumidification and air conditioning: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 130-147, January.
    5. Sphaier, L.A. & Nóbrega, C.E.L., 2012. "Parametric analysis of components effectiveness on desiccant cooling system performance," Energy, Elsevier, vol. 38(1), pages 157-166.

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