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Cooling performance of roof ponds with gunny bags floating on water surface as compared with a movable insulation

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  • Tang, Runsheng
  • Etzion, Y.

Abstract

A roof pond with gunny bags floating on water surface (RPWGB) has been proven to be an efficient evaporative based cooling technique in the previous studies of the authors due to the creation of thermal stratification inside the pond. In this paper, a mathematical model is developed for the investigation of its cooling performance as compared to a roof pond with a movable insulation (RPWMI) under hot dry climatic conditions. This one-dimensional model is based on the new empirical correlations of water evaporation rate from a wetted surface and a free water surface to the ambient air proposed by the authors, and takes into account the response of buildings as a whole to evaporative cooling. Results by simulations indicated that RPWGB performed slightly better than RPWMI, which is widely considered as the most efficient evaporative based roof cooling techniques, except when they are applied to a building with poorly insulated light walls and roof.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:30:y:2005:i:9:p:1373-1385
    DOI: 10.1016/j.renene.2004.10.008
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    References listed on IDEAS

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    1. 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.
    2. 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.
    3. Gandhidasan, P., 1989. "Simplified model for the behaviour of a roof-spray cooling system," Applied Energy, Elsevier, vol. 34(1), pages 69-77.
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    1. 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.
    2. Rachana Vidhi, 2018. "A Review of Underground Soil and Night Sky as Passive Heat Sink: Design Configurations and Models," Energies, MDPI, vol. 11(11), pages 1-24, October.
    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. Carlos J. Esparza-López & Carlos Escobar-del Pozo & Karam M. Al-Obaidi & Marcos Eduardo González-Trevizo, 2022. "Improving the Thermal Performance of Indirect Evaporative Cooling by Using a Wet Fabric Device on a Concrete Roof in Hot and Humid Climates," Energies, MDPI, vol. 15(6), pages 1-18, March.
    5. Ramkishore Singh & Dharam Buddhi & Nikolai Ivanovich Vatin & Chander Prakash & Saurav Dixit & Gurbir Singh Khera & Sergei A. Solovev & Svetlana B. Ilyashenko & Vinod John, 2022. "Life Cycle Saving Analysis of an Earth-Coupled Building without and with Roof Evaporative Cooling for Energy Efficient Potato Storage Application," Energies, MDPI, vol. 15(11), pages 1-18, June.
    6. 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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    Keywords

    Roof pond; Evaporative cooling;

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