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Energy performance of green fa?ades

Author

Listed:
  • Fabiana Convertino
  • Angeliki Kavga
  • Ileana Blanco

Abstract

Green fa?ades consist of the application of vegetation on buildings? vertical enve-lope. The integration of vegetation into the building fabric improves not only the aesthetic appearance, but also the energy performance of the building itself. The introduction of green fa?ades mainly aims at a passive thermal control of build-ings? for enhancing sustainability of the built environment. An experimental green fa?ade was tested at the University of Bari, in a Mediterranean climate context. The experimental green fa?ade was south-exposed and realized with evergreen plants, following the characteristics of the indirect typology. A portion of the south wall was left bare to be used as a control for comparison. The contribution of the green fa?ade in terms of passive climate control was particularly relevant during summer. Vegetation affects the boundary climatic conditions and the surface temperature. A reduction in sensible air and surface temperature of up to 2.2?C and 6.7?C, respectively, was recorded. The wall behind vegetation received 95.6% less solar radiative energy than the bare wall. These results were a direct conse-quence of the two main cooling mechanisms that characterize the green fa?ade, the evapotranspiration and the shading effect. These effects affected the heat transfer reducing the energy input through the covered wall. The reduction of the incoming heat through the covered wall was read as energy saving, since it inevita-bly affects the building energy demand for cooling. It was found that the green fa-?ade allowed a mean daily energy saving of 1.1 MJ m-2 and that 90.9% of this was obtained at daytime. These findings contribute to increasing the knowledge of en-ergy functioning and of the real advantages provided by green fa?ades.

Suggested Citation

  • Fabiana Convertino & Angeliki Kavga & Ileana Blanco, 2022. "Energy performance of green fa?ades," RIVISTA DI STUDI SULLA SOSTENIBILITA', FrancoAngeli Editore, vol. 0(2), pages 29-40.
    • Handle: RePEc:fan:rissri:v:html10.3280/riss2022-002003
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    References listed on IDEAS

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    1. Manso, Maria & Teotónio, Inês & Silva, Cristina Matos & Cruz, Carlos Oliveira, 2021. "Green roof and green wall benefits and costs: A review of the quantitative evidence," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    2. Cuce, Erdem, 2017. "Thermal regulation impact of green walls: An experimental and numerical investigation," Applied Energy, Elsevier, vol. 194(C), pages 247-254.
    3. Lee, Louis S.H. & Jim, C.Y., 2019. "Energy benefits of green-wall shading based on novel-accurate apportionment of short-wave radiation components," Applied Energy, Elsevier, vol. 238(C), pages 1506-1518.
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