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Periodic theory of an open roof pond

Author

Listed:
  • Sodha, M.S.
  • Kumar, A.
  • Singh, U.
  • Tiwari, G.N.

Abstract

This paper describes an analysis of the reduction of the heat flux coming into a room through a roof with an open water pond. A periodic analysis of the system, based on the linearisation of Dunkle's6 expressions for convective, radiative and evaporative losses, is presented. Numerical computation for the heat flux has been carried out for a typical hot day, the 19th of June, 1979, in New Delhi. These results were compared with those for a water-sprayed system. It was found that, for typical parameters, there are reductions in the maximum heat flux entering the room of 48% and 41% for the roof pond and water-sprayed systems, respectively (for a relative humidity of 0·8). The corresponding reductions in daily heat input into the room are 20% and 35%, respectively. Load levelling is, of course, much better in the case of the open roof pond.

Suggested Citation

  • Sodha, M.S. & Kumar, A. & Singh, U. & Tiwari, G.N., 1980. "Periodic theory of an open roof pond," Applied Energy, Elsevier, vol. 7(4), pages 305-319, December.
    • Handle: RePEc:eee:appene:v:7:y:1980:i:4:p:305-319
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    Cited by:

    1. Tang, Runsheng & Etzion, Y., 2005. "Cooling performance of roof ponds with gunny bags floating on water surface as compared with a movable insulation," Renewable Energy, Elsevier, vol. 30(9), pages 1373-1385.
    2. Spanaki, Artemisia & Kolokotsa, Dionysia & Tsoutsos, Theocharis & Zacharopoulos, Ilias, 2014. "Assessing the passive cooling effect of the ventilated pond protected with a reflecting layer," Applied Energy, Elsevier, vol. 123(C), pages 273-280.
    3. Spanaki, Artemisia & Tsoutsos, Theocharis & Kolokotsa, Dionysia, 2011. "On the selection and design of the proper roof pond variant for passive cooling purposes," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(8), pages 3523-3533.
    4. Goudarzi, Hossein & Mostafaeipour, Ali, 2017. "Energy saving evaluation of passive systems for residential buildings in hot and dry regions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 68(P1), pages 432-446.
    5. Runsheng, Tang & Etzion, Y. & Erell, E., 2003. "Experimental studies on a novel roof pond configuration for the cooling of buildings," Renewable Energy, Elsevier, vol. 28(10), pages 1513-1522.
    6. Ben Cheikh, Hamida & Bouchair, Ammar, 2004. "Passive cooling by evapo-reflective roof for hot dry climates," Renewable Energy, Elsevier, vol. 29(11), pages 1877-1886.
    7. Sharifi, Ayyoob & Yamagata, Yoshiki, 2015. "Roof ponds as passive heating and cooling systems: A systematic review," Applied Energy, Elsevier, vol. 160(C), pages 336-357.

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