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Buildings 2015, 5(2), 497-520; doi:10.3390/buildings5020497

Dynamic Simulation of the Green Roofs Impact on Building Energy Performance, Case Study of Antananarivo, Madagascar

1
Institute for the Management of Energy (IME), University of Antananarivo, P.O. Box 566, Antananarivo 101, Madagascar
2
Research Unit Piment, University of La Reunion, 117 Rue du Général Ailleret 97430, Le Tampon Reunion, France
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Chimay J. Anumba
Received: 27 January 2015 / Revised: 23 April 2015 / Accepted: 5 May 2015 / Published: 19 May 2015
(This article belongs to the Special Issue Eco-Towers: Technology, Sustainability, and Resilience)
View Full-Text   |   Download PDF [908 KB, uploaded 20 May 2015]   |  

Abstract

Green roofs improve building energy performance and constitute an alternative to sustainable buildings. A green roof model is dynamically coupled with a building thermal model to assess its energy performance that takes into account the indoor air temperature dynamic changes. Under the climate conditions in Antananarivo, we compared green and conventional roofs. The present study shows that green roofs protect the roof structure under extreme temperature and large temperature fluctuations. For the case of Antananarivo, the amplitude of the temperature fluctuations at the top face of the support is reduced by 28 °C when using green roof. The impact of the green roof on indoor air temperature and energy demand is investigated. The vegetation decreases the maximum indoor air temperature and improves the building thermal comfort during summer days. It has no effect on the minimum indoor air temperature, but additional soil thickness can increase it. In addition, a global sensitivity analysis, which is carried out on the proposed model without considering any specific weather data, allows us to identify the most influential parameters on the energy demand. It has been found that green roofs have almost insignificant thermal impact in insulated buildings; however, their potential prevails over the building envelope and weather characteristics in the case of non-insulated building. View Full-Text
Keywords: green roof; building energy performance; thermal comfort; simulation; global sensitivity analysis green roof; building energy performance; thermal comfort; simulation; global sensitivity analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Rakotondramiarana, H.T.; Ranaivoarisoa, T.F.; Morau, D. Dynamic Simulation of the Green Roofs Impact on Building Energy Performance, Case Study of Antananarivo, Madagascar. Buildings 2015, 5, 497-520.

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