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Experimental studies on a novel roof pond configuration for the cooling of buildings

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  • Runsheng, Tang
  • Etzion, Y.
  • Erell, E.

Abstract

A new evaporation based passive cooling technology was tested. The technology is based on the exposure of “floating” wetted cloth to the ambient air. It was compared to various other passive cooling techniques, with very favorable results. Two identical shallow ponds were constructed. One of them was covered with white cotton towels stretched on a densely perforated PVC panel supported by pieces of waterproof polystyrene keeping it just floating on the water surface. Five comparable experiments of different cooling techniques have been carried out. The results indicate that the new cooling technique performed slightly better than the pond with movable insulation, which is widely considered as one of the best roof cooling techniques based on evaporation. It seems that the higher efficiency of the tested technique is due to the thermal stratification created in the water inside the pond, which more effectively resists the transfer of heat gains from the sun and ambient air into the deep water of the pond. In turn, the water temperature near the floor of the pond is lower, thus heat flow from the building to the pond is increased. During the experiment, all the ponds which were compared were ranked according to performance (from best to worse): shaded pond with towels floated on it, pond with towels floated on it and pond with movable insulation, shaded open pond, open pond, covered pond.

Suggested Citation

  • 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.
  • Handle: RePEc:eee:renene:v:28:y:2003:i:10:p:1513-1522
    DOI: 10.1016/S0960-1481(03)00002-8
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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. 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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    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. Ying-Chen Lee & Tsang-Jung Chang & Cheng-I Hsieh, 2018. "A Numerical Study of the Temperature Reduction by Water Spray Systems within Urban Street Canyons," Sustainability, MDPI, vol. 10(4), pages 1-28, April.
    3. Muhammad Syukri Imran & Azhaili Baharun & Siti HalipahIbrahim & Wan Azlan Wan Zainal Abidin, 2017. "Evaluation of low cost radiant cooling panel in a test room with passively cooled water," Journal of Advances in Technology and Engineering Research, A/Professor Akbar A. Khatibi, vol. 3(5), pages 211-223.
    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. Ferdinando Salata & Iacopo Golasi & Emanuele De Lieto Vollaro & Fabio Bisegna & Fabio Nardecchia & Massimo Coppi & Franco Gugliermetti & Andrea De Lieto Vollaro, 2015. "Evaluation of Different Urban Microclimate Mitigation Strategies through a PMV Analysis," Sustainability, MDPI, vol. 7(7), pages 1-19, July.
    6. 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.
    7. Rosso, Federica & Golasi, Iacopo & Castaldo, Veronica Lucia & Piselli, Cristina & Pisello, Anna Laura & Salata, Ferdinando & Ferrero, Marco & Cotana, Franco & de Lieto Vollaro, Andrea, 2018. "On the impact of innovative materials on outdoor thermal comfort of pedestrians in historical urban canyons," Renewable Energy, Elsevier, vol. 118(C), pages 825-839.
    8. Majed Abuseif & Zhonghua Gou, 2018. "A Review of Roofing Methods: Construction Features, Heat Reduction, Payback Period and Climatic Responsiveness," Energies, MDPI, vol. 11(11), pages 1-22, November.
    9. 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.
    10. 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.
    11. Lu, Xing & Xu, Peng & Wang, Huilong & Yang, Tao & Hou, Jin, 2016. "Cooling potential and applications prospects of passive radiative cooling in buildings: The current state-of-the-art," Renewable and Sustainable Energy Reviews, Elsevier, vol. 65(C), pages 1079-1097.
    12. 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.
    13. 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.
    14. Federica Rosso & Anna Laura Pisello & Veronica Lucia Castaldo & Marco Ferrero & Franco Cotana, 2017. "On Innovative Cool-Colored Materials for Building Envelopes: Balancing the Architectural Appearance and the Thermal-Energy Performance in Historical Districts," Sustainability, MDPI, vol. 9(12), pages 1-13, December.

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    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 & 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.
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    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.
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