Building and Urban Cooling Performance Indexes of Wetted and Green Roofs—A Case Study under Current and Future Climates

Madi Kaboré, Emmanuel Bozonnet and Patrick Salagnac
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Madi Kaboré: LaSIE (UMR CNRS 7356), La Rochelle University, Av. M. Crépeau, 17042 La Rochelle, France
Emmanuel Bozonnet: LaSIE (UMR CNRS 7356), La Rochelle University, Av. M. Crépeau, 17042 La Rochelle, France
Patrick Salagnac: LaSIE (UMR CNRS 7356), La Rochelle University, Av. M. Crépeau, 17042 La Rochelle, France

Energies, 2020, vol. 13, issue 23, 1-16

Abstract: We developed and studied key performance indexes and representations of energy simulation heat fluxes to evaluate the performance of the evaporative cooling process as a passive cooling technique for a commercial building typology. These performance indexes, related to indoor thermal comfort, energy consumption and their interactions with their surrounding environments, contribute to understanding the interactions between the urban climate and building for passive cooling integration. We compare the performance indexes for current and future climates (2080), according to the highest emission scenario A2 of the Special Report on Emission Scenario (SRES). Specific building models were adapted with both green roof and wetted roof techniques. The results show that summer thermal discomfort will increase due to climate change and could become as problematic as winter thermal discomfort in a temperate climate. Thanks to evapotranspiration phenomena, the sensible heat contribution of the building to the urban heat island (UHI) is reduced for both current and future climates with a green roof. The performance of the vegetative roof is related to the water content of the substrate. For wetted roofs, the impacts on heat transferred to the surrounding environment are higher for a Mediterranean climate (Marseille), which is warmer and drier than the Paris climate studied (current and future climates). The impact on indoor thermal comfort depends on building insulation, as demonstrated by parametric studies, with higher effects for wetted roofs.

Keywords: evaporative passive cooling; passive building key performance index; summer thermal comfort; urban heat island; climate change (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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