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Diurnal and partitioned heat-flux patterns of coupled green-building roof systems

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  • Jim, C.Y.

Abstract

Coupled green-building roof system can assess bidirectional heat-flux with indoor space. Two high-rise residential blocks in humid-subtropical Hong Kong, with and without roof building thermal insulation (BTI), were monitored for thermal performance across seasons and weather conditions. Each block had three plots: Sedum and herbaceous Peanut green roofs, plus bare Control. Diurnal heat-flux data were partitioned into daytime and nighttime, and positive and negative fractions. On hot summer-sunny day, Control without BTI facilitates notable daytime influx and nighttime efflux of heat. Sedum augments thermal-mass effect pushing more heat indoor than Control. With balance between transpiration-cooling and heat-sink formation, Peanut registers intermediate heat gain. Adding BTI raises heat-gain and eliminates Control heat-loss, curtails Sedum heat-gain, and maintains Peanut heat-gain. BTI partnering with green roof offer synergistic thermal benefit by increasing thermal mass, thermal capacity and thermal resistance to furnish thermal buffering, thermal lag, and extending heat ingress to nighttime. Lower solar-radiation input on summer-cloudy day significantly trims heat gain at Control, with limited reduction at both green roofs. Summer-rainy day brings further drop in heat gain. For cloudy and rainy scenarios, heat-gain suppression is more notable with BTI. Interpretations for other season-weather conditions and implications of the findings are elaborated.

Suggested Citation

  • Jim, C.Y., 2015. "Diurnal and partitioned heat-flux patterns of coupled green-building roof systems," Renewable Energy, Elsevier, vol. 81(C), pages 262-274.
    • Handle: RePEc:eee:renene:v:81:y:2015:i:c:p:262-274
    DOI: 10.1016/j.renene.2015.03.044
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    References listed on IDEAS

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    1. Tsang, S.W. & Jim, C.Y., 2011. "Theoretical evaluation of thermal and energy performance of tropical green roofs," Energy, Elsevier, vol. 36(5), pages 3590-3598.
    2. Jaffal, Issa & Ouldboukhitine, Salah-Eddine & Belarbi, Rafik, 2012. "A comprehensive study of the impact of green roofs on building energy performance," Renewable Energy, Elsevier, vol. 43(C), pages 157-164.
    3. Spala, A. & Bagiorgas, H.S. & Assimakopoulos, M.N. & Kalavrouziotis, J. & Matthopoulos, D. & Mihalakakou, G., 2008. "On the green roof system. Selection, state of the art and energy potential investigation of a system installed in an office building in Athens, Greece," Renewable Energy, Elsevier, vol. 33(1), pages 173-177.
    4. Santamouris, M. & Pavlou, C. & Doukas, P. & Mihalakakou, G. & Synnefa, A. & Hatzibiros, A. & Patargias, P., 2007. "Investigating and analysing the energy and environmental performance of an experimental green roof system installed in a nursery school building in Athens, Greece," Energy, Elsevier, vol. 32(9), pages 1781-1788.
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    Cited by:

    1. Yu Zhang & Lei Zhang & Luyao Ma & Qinglin Meng & Peng Ren, 2019. "Cooling Benefits of an Extensive Green Roof and Sensitivity Analysis of Its Parameters in Subtropical Areas," Energies, MDPI, vol. 12(22), pages 1-22, November.
    2. Jim, C.Y., 2015. "Cold-season solar input and ambivalent thermal behavior brought by climber greenwalls," Energy, Elsevier, vol. 90(P1), pages 926-938.

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