Green and cool roofs’ urban heat island mitigation potential in tropical climate

Renaturing a microclimate: The impact of greening a neighbourhood on indoor thermal comfort during a heatwave in Manchester, UK

“…In addition, it was shown that indoor energy demand and comfort are strongly correlated to outdoor microclimate. Furthermore, several scholars have reported the contribution of vegetation on the roof level (as green roof) in reducing the ambient air temperature in cities [26,27]. However, less studies have coupled outdoor and indoor thermal environmets in a way to explore the impact of changing the neighbourhood land cover and greenness on indoor thermal comfort.…”

Numerical Simulation of Local Climate Zone Cooling Achieved through Modification of Trees, Albedo and Green Roofs—A Case Study of Changsha, China

“…It usually has two distinctive types, intensive and extensive. Intensive green roofs come with very high maintenance costs and heavy structural support because they employ deep growth media and high growth media for trees and shrubs [72], while extensive green roofs are cost-effective and easy to maintain, with a thin layer of vegetation and shallow soil [41]. Therefore, this study only considers the extensive green roof, which is more widely used.…”

Evaluating the Operational Potential of LRV Signatures Derived from UAV Imagery in Performance Evaluation of Cool Roofs

“…The roof design is a decisive factor in conserving the energy of the building because the roof surface is directly exposed to solar radiation and is a pathway to transfer ambient solar heat inside the building. There is a previous research categorizing 10 roofs according to various energy conservation criteria such as heat gain reduction, heat flux reduction, lighting energy conservation, and internal temperature maintenance as shown below: (1) concrete roof (heat gain reductions: 40%) [1]; (2) cool roof (Heat gain reductions: 33%) [2]; (3) insulated roof(Heat flux reductions: 75%) [3]; (4) roof garden or Green roof (heat flux reductions: 31-37%) [4]; (5) photovoltaic panel roof (heat flux reductions: 60-63%) [5]; (6) biosolar (heat flux reductions: 50%) [6]; (7) double-skin roof (heat gain reductions: 71%) [7]; (8) roof ponds (keep the internal temperature as 24-28 • C) [8]; (9) sky catcher (lighting energy conservation: Loads 20%); (10) wind catcher (energy consumption savings: 16-27%) [9]. Among the researches related to the roof designs in conserving the energy, roof gardens (green roof) and cool roof accounts about 50% of articles registered in the Web of Science database until 2018 [10].…”

“…Compared to the roof garden, a cool roof is more effective in cost and heat convection. Cool roof reduces more heat conduction into buildings (0.14 KWh/m 2 ; 8%) than the roof garden (0.008 KWh/m 2 ; 0.4% [4]). The installation cost of cool roof is 4.7 times cheaper than the green roof during the entire life cycle (initial investment cost, maintenance cost, dismantling, and waste disposal expense [11]).…”