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Proceedings of the International Academy of Ecology and Environmental Sciences, 2021, 11(3): 150-158
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Article

Energy balance modeling of an extensive green roof for the surface temperature mitigation of municipal buildings

Somayeh Feyz1, Leila Ooshaksaraie1, Alireza Mardookhpour2
1Department of Environmental Engineering, Lahijan Branch, Islamic Azad University, Lahijan, Iran
2Department of Civil Engineering, Lahijan Branch, Islamic Azad University, Lahijan, Iran

Received 8 May 2021;Accepted 15 June 2021;Published 1 September 2021
IAEES

Abstract
In recent years, changing an urban environment, urban development and replacing no vegetated surface face to environmental challenges that can be the reasons for increasing urban temperatures and consequently causing urban heat island effects. These can be mitigated by environmental planning and building techniques, such as green roof that can moderate roof surface temperature and mitigate Urban Heat Island (UHI) phenomenon. In this context the present research deals with modeling of the surface temperature of green roofs located in Tehran, Iran. The surface temperature of both green and conventional roofs was modeled in ten years which months have the highest temperature in summer. Energy balance modeling carried out in conventional roof as a reference bituminous flat roof and extensive green roof with 85% vegetated surface and 50% accessible water. The modeling demonstrated the positive impact of green roof in decreasing the roof surface temperature. The modeling of green roofs in the summer determined that QH and Qnet values are lower and QE are higher than conventional roof. The results also showed that the conventional roof in Jun and August reached a peak of 48.69oC and 42.7oC whereas green roof were able to reach 44.47oC and 38.49oC respectively. In conclusion the reduced surface temperatures and increase in latent heat will be brought a decrease in sensible heat and hence a potential mitigation of the urban heat island effect via applying green roofs on existing buildings. The results indicated that green roofs can be beneficial on the environment and urban area such as improvement of air quality, biodiversity and noise reduction, green space increasing per capita.

Keywords extensive green roofs;roof surface temperature;urban heat island;energy balance modeling.


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