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Seasonal and Diurnal Thermal Performance of a Subtropical Extensive Green Roof: The Impacts of Background Weather Parameters

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  • Lilliana L. H. Peng

    (Department of Urban and Rural Planning, College of Architecture, Nanjing Tech University; No. 30 Puzhu Road, Nanjing 210094, China)

  • C. Y. Jim

    (Department of Geography, The University of Hong Kong, Pokfulam Road, Hong Kong, China)

Abstract

Most studies explored green-roof thermal effects on a few hot summer days based on short-term monitoring data. Few studies investigated the seasonal and diurnal patterns of thermal performance and associated weather effects. This research aims to address the following two questions: (1) how green-roof thermal performance varies with different season and time; and (2) to what extent can thermal performance be predicted by background weather parameters? A retrofitted extensive green roof was established on the top of a railway station in subtropical Hong Kong. Monitoring data covering a two-year period, one year before roof greening and one year after, were collected and analyzed. Results indicated notable seasonal and diurnal patterns of green-roof thermal performance. It exhibited cooling effects in spring, summer and fall, but warming effects in winter. The cooling effects were more pronounced in summer than spring and fall, on sunny days than rainy and cloudy days, and in nighttime than daytime. Air temperature, relative humidity, wind speed, solar radiation, and soil moisture could explain 83.6%–86% of the thermal effects’ variation. The multiple-regression models based on the five weather variables established in this study provide an uncomplicated and direct approach to predict the thermal performance of similar extensive green roofs in subtropical areas.

Suggested Citation

  • Lilliana L. H. Peng & C. Y. Jim, 2015. "Seasonal and Diurnal Thermal Performance of a Subtropical Extensive Green Roof: The Impacts of Background Weather Parameters," Sustainability, MDPI, vol. 7(8), pages 1-16, August.
    • Handle: RePEc:gam:jsusta:v:7:y:2015:i:8:p:11098-11113:d:54210
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    Cited by:

    1. A. Raimondi & G. Becciu, 2021. "Performance of Green Roofs for Rainwater Control," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(1), pages 99-111, January.
    2. Fabiana Frota de Albuquerque Landi & Claudia Fabiani & Anna Laura Pisello, 2021. "Experimental Winter Monitoring of a Light-Weight Green Roof Assembly for Building Retrofit," Sustainability, MDPI, vol. 13(9), pages 1-20, April.
    3. Stefano Cascone, 2019. "Green Roof Design: State of the Art on Technology and Materials," Sustainability, MDPI, vol. 11(11), pages 1-27, May.
    4. Maria Luíza Santos & Cristina Matos Silva & Filipa Ferreira & José Saldanha Matos, 2023. "Hydrological Analysis of Green Roofs Performance under a Mediterranean Climate: A Case Study in Lisbon, Portugal," Sustainability, MDPI, vol. 15(2), pages 1-18, January.

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