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Roof ponds combined with a water-to-air heat exchanger as a passive cooling system: Experimental comparison of two system variants

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  • Almodovar, José Manuel
  • La Roche, Pablo

Abstract

This paper evaluates two roof pond configurations combined with a water-to-air heat exchanger (WAHE). Test cells of 1.35 m × 1.35 m x 1.35 m with the same thermal properties, except for the roofs, are built in a hot-dry climate with mild winters. They are connected with a WAHE placed inside the roof pond's water by a pipe through which the indoor air is re-circulated. The first roof consists of a 0.35 m deep water pond covered with a floating polystyrene insulation 0.03 m thick, and a spray system located 0.5 m above it that operates at night. The second roof is covered with an aluminum plate separated by a 0.10 m air gap above a 0.25 m deep water pond. We ran multiple series and compared the results to a control cell that had a California energy code compliant insulated roof. Predictive equations are developed to dimension the WAHE system. Results demonstrate that the cells with roof ponds have better cooling performance than the code compliant control cell. The best performance is obtained in the cell with the WAHE operating continuously. In this case, the indoor temperature stayed below 24 °C even with ambient temperatures above 35 °C.

Suggested Citation

  • Almodovar, José Manuel & La Roche, Pablo, 2019. "Roof ponds combined with a water-to-air heat exchanger as a passive cooling system: Experimental comparison of two system variants," Renewable Energy, Elsevier, vol. 141(C), pages 195-208.
    • Handle: RePEc:eee:renene:v:141:y:2019:i:c:p:195-208
    DOI: 10.1016/j.renene.2019.03.148
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    References listed on IDEAS

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    1. 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.
    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.
    3. 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.
    4. Peretti, Clara & Zarrella, Angelo & De Carli, Michele & Zecchin, Roberto, 2013. "The design and environmental evaluation of earth-to-air heat exchangers (EAHE). A literature review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 28(C), pages 107-116.
    5. Ascione, Fabrizio & Bellia, Laura & Minichiello, Francesco, 2011. "Earth-to-air heat exchangers for Italian climates," Renewable Energy, Elsevier, vol. 36(8), pages 2177-2188.
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