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Tamil Nadu Agricultural University (2016)

Evaluation of techno economic feasibility and environmental compatibility of green roof systems

Jayabharathi J

Titre : Evaluation of techno economic feasibility and environmental compatibility of green roof systems

Auteur : Jayabharathi J

Université de soutenance : Tamil Nadu Agricultural University

Grade : Doctor of Philosophy (PhD) in Soil and Water Conservation Engineering 2016

Résumé partiel
Industrialization and urbanization has improved our material lives and comfort, but change in land use and land cover pattern (LULC) in urban areas has reduced the vegetative cover. With absence or reduction in vegetation many problems are induced such as urban heat islands, global warming, air pollution, etc. To overcome these problems several ventures are in vogue and one of the most recent ones in India being the adoption of green roof. Green roof plays major role in urban horticulture and can provide numerous potential benefits such as improving urban environment and reducing urban heat island effect. Green roof also called as vegetable roof or inhibit roof is one engineering system through which it is possible to grow vegetation on roof. Green roof term refers to a system created of light pre-made layers in which vegetables are cultivated in any growing medium and becomes part of the building as such. In this research work, five pre made layers were used for constructing the green roof viz. concrete roof deck as the base with PVC as water proofing layer, Polypropylene as root barrier layer, Egg mat shape PVC as drainage layer and woven filter fabric layer as the top most pre made layer where the substrate medium is filled. For this both soil (sandy clay) and soil less (Cocopeat and compost) mediums were used in which the vegetative layers were raised. The depth of the substrate decides whether the green roof system adopted is intensive or extensive and based on it, the crop is selected for cultivation on the green roof. In intensive green roof system, the depth of substrate used is usually greater than 20 cm while in extensive roof the depth it is lesser than 20 cm. Tomato crop with effective root depth of 30 cm was cultivated in the intensive green roof system while marigold with 15 cm was raised in the extensive green roof system. FASST Model is a popular model for energy balance in the green roofs and this was used in this study to calculate the heat flux through the green roof and urban heat island effect due to it. Collection and analysis of experimental data was used to assess the heat and mass transfer between roof and surrounding environment in both types of the green roof. Experimental results were used to define the thermal performance of green roof and evaluate its economic value

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Page publiée le 18 avril 2021