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2 edition of Durability of high-albedo roof coatings and implications for cooling energy savings found in the catalog.

Durability of high-albedo roof coatings and implications for cooling energy savings

Sarah E. Bretz

Durability of high-albedo roof coatings and implications for cooling energy savings

by Sarah E. Bretz

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  • 7 Currently reading

Published by Lawrence Berkeley Laboratory in Berkeley, CA .
Written in English


Edition Notes

StatementSarah E. Bretz, Hashem Akbari.
The Physical Object
Paginationi, 30 p.
Number of Pages30
ID Numbers
Open LibraryOL17589943M

Sustainability, an international, peer-reviewed Open Access journal. Dear Colleagues, CIRIAF (Inter-University Research Center on Pollution and Environment “Mauro Felli” is a research center, based at the University of Perugia, which promotes interdisciplinary research activities in the fields of environmental pollution and its health and socio-economic effects, sustainable development. Washington, DC: The National Academies Press. doi: / 36 because many highway maintenance facilities have more roof area than wall area, cooling loads are driven by the roof heat gain, which is especially important for spaces cooled only by ventilation. Solar heat gain can negate the energy savings of daylighting systems if.

- veg on roof - conserve energy, reduce runoff, CO2, filter, reduce heat island - passive cooling Extensive Green Roof - less than 6" soil for grasses Intensive Green Roof - deeper soil 12"" - shrubs, small trees, water features, catagort IV wildflowers Steps 1. WP membrane over roof structure (PVC, EPDM) 2. root barrier (PVC, EPDM, TPO) 3. "Recent cool pavement research highlights: Quantifying the energy and environmental consequences of cool pavements." Gao, Yafeng, Dachuan Shi, Ronnen M Levinson, Rui Guo, Changqing Lin, and Jing Ge. "Thermal performance and energy savings of white and sedum-tray garden roof: A case study in a Chongqing office building.".

Meanwhile, the adoption of 50%-BEES can reduce cooling and heating electricity use intensity (kWh/m2/a) by 38%. However, energy savings are not significant if comparing buildings with 65%-BEES and 50%-BEES. The results indicate that there exists a performance gap between calculated design performance savings and actual operation energy savings. Long-term performance of high-albedo roof coatings Long-term performance of high-albedo roof coatings Bretz, Sarah E.; Akbari, Hashem Cooling energy savings of 10 to 70% have been achieved by applying high-albedo coatings to residential in California Florida. Since dirt accumulation can alter the performance of high-albedo roofs as an energy efficiency measure, we examined.


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Durability of high-albedo roof coatings and implications for cooling energy savings by Sarah E. Bretz Download PDF EPUB FB2

@article{osti_, title = {Durability of high-albedo roof coatings and implications for cooling energy savings. Final report}, author = {Bretz, S E and Akbari, H}, abstractNote = {Twenty-six spot albedo measurements of roofs were made using a calibrated pyranometer. The roofs were surfaced with either an acrylic elastomeric coating, a polymer coating with an acrylic base, or a Cited by: 2.

absorption of solar energy, high-albedo coatings reduce building surface temperatures, and heat-transfer to the building interior. The lower surface temperatures also reduce the building's contribution to urban air temperature (Akbari et al., ).

To maximize cooling energy savings, high-albedo roof coatings should 1)have high solar reflectance. High-albedo materials can save cooling energy use by directly reducing the heat gain through a building`s envelope (direct effect) and also by lowering the urban air temperature in the neighborhood of the building (indirect effect).This project is an attempt to address high-albedo materials for buildings and to perform measurements of.

How to measure high-albedo properties of roof coatings. In Sectionthe main thermal-energy exchange between the roof surface and its surroundings has been particular, the thermal-energy balance of a cool surface characterized by high solar reflectance and Cited by: 8.

Energy and Buildings 25 () Long-term performance of high-albedo roof coatings Sarah E. Bretz, Hashem Akbari Lawrence Berkeley National Laboratory Berkeley, CAUSA Abstract Cooling energy savings of 10 to 70% have been achieved by applying high-albedo coatings to residential buildings in California and by: The authors have demonstrated that thermal energy needs of buildings for summer cooling can be reduced up to 60% by applying " cool paints " on the external surface of walls and roof, while low Author: Anna Laura Pisello.

@article{osti_, title = {High-albedo materials for reducing building cooling energy use}, author = {Taha, H and Sailor, D and Akbari, H}, abstractNote = {One simple and effective way to mitigate urban heat islands, i.e., the higher temperatures in cities compared to those of the surrounds, and their negative impacts on cooling energy consumption is to use high-albedo materials on major Cited by: Table 1.

Results of Reflective Roof Retrofit Field Tests. Energy use (kWh/day) Reduction in utility Test Site and Description Albedo before Albedo after Before After Savings coincident peak demand ( pm) _____ Site #0 Merritt Island -- Not Measured white ceramic coating on asphalt (11%) shingles, concrete block with R ceiling insulation, attic duct system.

Reflective surfaces can deliver high solar reflectance (the ability to reflect the visible, infrared and ultraviolet wavelengths of the sun, reducing heat transfer to the surface) and high thermal emittance (the ability to radiate absorbed, or non-reflected, solar energy).

Reflective surfaces are a form of geoengineering. The most well-known type of reflective surface is the "cool roof". One of the earliest whole-building studies measuring cooling energy savings from reflective roof coatings was performed by an electric utility in Southern Mississippi [15].

Two identical side-by-side commercial office buildings were monitored in which one had its roof. Also known as cool roofing, these roof coatings are available in a number of colors, surfaces, and thicknesses and can make a huge difference when it comes to saving money on energy costs and usage.

On top of that, they also aid in creating more comfortable indoor environments, and play a role in prolonging the life of roofs and roofing materials. (high-albedo) roofs, such as white coatings, the difference is only about lODe.

Measured data and computer simulations have demonstrated the impact of roof albedo in saving cooling energy use in buildings. Savings depend on the climate and the amount of roof insulation. The cooling energy savings for reflective roofs are highest in hot climates. Akbari, H., S.

Konopacki, and M. Pomerantz. "Cooling energy savings potential of reflective roofs for residential and commercial buildings in the United States." Ene no. 5 (): Bretz, Sarah E., and Hashem Akbari.

"Long-term performance of high-albedo roof coatings." Energy and Buildi no. 2 (): In cooling dominant climates, a low-emissivity roof will lead to a higher roof temperature and, hence, a higher cooling load from the this paper we summarize the result of computer simulations and analyze the impact of roof albedo and emissivity on heating and cooling energy use.

The estimated annual cooling energy savings of the model houses in this study are and kWhm -2 yr -1, respectively, for a increase in roof albedo from the concrete roof to the.

Analyzed and calculated the energy savings of heat reflective coatings applied on multi-storied residential buildings and high-risen commercial buildings in Beijing. Some advices about the application of heat reflective coatings in northern cold region are given. Energy saving effect was evaluated with the building energy simulation in winter and summer while the heat reflective coating is Author: Qian Jin Mao, Qiu Rui Lv, Shun Jie Sun, Su Ping Cui, Zi Ming Wang.

The estimated energy savings of roof was about Wh/m 2 per day and the energy consumption reducing rate was up to % in summer. Considering the energy consumption increased in winter, heat-reflective coatings were only strongly advised to paint on roofs in cold : Qiu Rui Lv, Qian Jin Mao, Ya Li Wang, Zi Ming Wang, Su Ping Cui.

FSEC-PF Abstract. A series of experiments in Florida residences have measured the impact on space cooling of increasing roof solar reflectance. In tests on 11 homes with the roof color changed mid summer, the average cooling energy use was reduced by 19%.

The materials used for construction of building absorb and transfer heat inside of the building all the day. Heat always flow from the warmer side to cooler side and cooler to warmer side. 80% to 95% of heat gain during summer and about 70% of heat loss during winter trasferred through the walls, ceiling and roofs of the building by way of conduction and radiation.

Show only items where. Author. Cool surfaces and shade trees to reduce energy use and improve air quality in urban areas on CO. By reducing the demand for cooling meteorology and its sensitivity to changes in2 energy, urban trees indirectly reduce emission of surface properties.Cooling Our Communities A Guidebook on Tree Planting and Light-Colored Surfacing Graphs ES-2 Urban areas are getting warmer xix ES-3 Rising temperatures and smog xix ES-6 Energy savings from residential tree planting xxi ES-7 Computer simulation of both wind-shielding and shading effects xxii ES-8 Daily surface temperatures xxiii ESWe are at the forefront of cutting-edge research that redefines building technology and explores all areas of urban systems.

We have been leaders for decades in developing energy-efficient windows, improving indoor air quality, coming up with new ideas to fix the nation's electricity grid, and so much more.