High-albedo roof coatings for reducing building cooling needs

Pisello, Anna Laura

doi:10.1016/b978-1-78242-380-5.00009-1

Cited by 18 publications

(9 citation statements)

References 54 publications

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“…Solar reflectance is a measure of the ability of a material to reflect incident solar radiation without absorbing it [23]. Infrared emittance measures the capability of the surface to re-emit the previously absorbed heat away from itself [24]. Their values are expressed as ratios that range from 0 to 1 without units.…”

Section: Methodsmentioning

confidence: 99%

Effect of Roof Tile Colour on Heat Conduction Transfer, Roof-Top Surface Temperature and Cooling Load in Modern Residential Buildings under the Tropical Climate of Malaysia

et al. 2021

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Modern residential roofs in Malaysia mainly employ red and brown roof tiles due to aesthetic factors and the ability of the roof surface to reflect or retard heat transfer is typically not considered the main priority. The present article reveals the findings of a study on the effect of roof tile colour on heat conduction transfer through roof tiles and ceiling boards, roof-top surface temperature and cooling load. Findings suggest that the selection of white roof tiles significantly reduces the peaks of heat conduction transfer and roof-top surface temperature as well as the values of heat conduction transfer and roof-top surface temperature throughout diurnal profiles, which consequently reduces hours of indoor thermal discomfort and use of air-conditioners in indoor spaces. A decline in peak roof-top surface temperature of up to 16.00 °C that results in annual energy savings of up to 13.14% can be achieved when the roof tile colour is changed from red to white. Further research on the development of solar-reflective paint or coating products that can significantly increase the solar reflectance values of non-white roof tiles are essential to overcome issues related to maintenance difficulties and lack of preference among house buyers towards white roof tiles.

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Section: Methodsmentioning

confidence: 99%

Effect of Roof Tile Colour on Heat Conduction Transfer, Roof-Top Surface Temperature and Cooling Load in Modern Residential Buildings under the Tropical Climate of Malaysia

et al. 2021

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“…In Figure 6, TR2-white had higher peaks of reflectance compared to TR1, being more responsive to the solar incoming radiation. For TR2-black, it is assumed a typical reflectance value of 4-8% [36]. TR2-black absorbs more of the incoming radiation, with peak value at 12:30.…”

Section: Tr2-green Compared With Black and White Coatingmentioning

confidence: 99%

“…Concerning the solar heat gains through incoming radiation, the reflectance variation between the surfaces affects the buildings' thermal performance. According to Pisello [36], a red natural clay tile solar reflectance is about 28 to 44%, while a grass-covered area typically is 20%. This difference is observed on the TR1 and TR2 measurements, where TR2-green reflected about 14% less than TR1.…”

Section: Tr2-green Compared With Black and White Coatingmentioning

confidence: 99%

Experimental Winter Monitoring of a Light-Weight Green Roof Assembly for Building Retrofit

2021

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Green roofs are a recurrent solution for improving environmental quality in buildings. Such systems can, among other things, reduce the urban heat island effect, improve indoor thermal comfort and visual quality, and reduce energy consumption in buildings, therefore promoting human comfort. This work presents the winter monitoring of a light-weight green roof assembly with the potential to be implemented in extensive urban areas. The green roof monitoring was compared to those of previous bituminous and cool-coating applications. Results show that the system was able to decrease heat losses maintaining a positive energy flow from solar radiation gains and a more constant indoor temperature. In a well-insulated construction, the impact during the cold season was discreet. However, compared to the reference building, a slightly lower indoor air temperature (about 1 °C) was registered.

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“…The coatings can be classified according to their binders, such as cementitious or elastomeric coatings. Alternatively, the coatings can also be categorized according to their carriers, such as solvent-or water-based coatings [33]. Essentially, for application on high-albedo roofs, the coatings are required to possess superficial thermal-optical properties that are appropriate for maintaining, under exposure to solar radiation, surface temperatures that are appreciably lower than those of conventional roofs.…”

Section: Introductionmentioning

confidence: 99%

Thermal-Energy Performance of Bulk Insulation Coupled with High-Albedo Roof Tiles in Urban Pitched Residential Roof Assemblies in the Hot, Humid Climate

et al. 2022

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The high rate of heat transfer through the residential roof assembly aggravates the condition of indoor thermal discomfort. Bulk insulation can be installed in the assembly to improve thermal performance. However, although it can efficiently reduce diurnal heat transfer from the outdoor environment into the indoor space through the roof assembly, it can also suppress nocturnal heat transfer in the opposite direction. Alternatively, high-albedo roof tiles employ cool colors to reflect heat at the roof surface, whereas bulk insulation hinders the conduction of heat through the roof assembly. In light of the potential of high-albedo roof tiles and bulk insulation in reducing heat transfer, thermal-energy performance of an urban pitched residential roof assembly, which adopted varying configurations of high-albedo roof tiles and bulk insulation under a hot, humid climate, was evaluated. Energy savings were generated, which were 15.13% when the change from a conventional to a high-albedo roof surface was performed, and 17.00% when the installation of bulk insulation was performed on the high-albedo roof assembly.

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High-albedo roof coatings for reducing building cooling needs

Cited by 18 publications

References 54 publications

Effect of Roof Tile Colour on Heat Conduction Transfer, Roof-Top Surface Temperature and Cooling Load in Modern Residential Buildings under the Tropical Climate of Malaysia

Effect of Roof Tile Colour on Heat Conduction Transfer, Roof-Top Surface Temperature and Cooling Load in Modern Residential Buildings under the Tropical Climate of Malaysia

Experimental Winter Monitoring of a Light-Weight Green Roof Assembly for Building Retrofit

Thermal-Energy Performance of Bulk Insulation Coupled with High-Albedo Roof Tiles in Urban Pitched Residential Roof Assemblies in the Hot, Humid Climate

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