Open Access Open Access  Restricted Access Subscription or Fee Access

Energy Conservation with use of Cool Roof Coatings

Sandeep Rai, Jinkal Mistry

Abstract


Regions with hot and dry climate often experience very high levels of solar radiation, high ambient temperatures and relatively low specific humidity. The roofs of buildings in such areas are always exposed to Sun for long duration during the daytime. Solar radiation is responsible for heat transfer through the building roof. Actually, Solar radiation heat the roof which in turn reradiates the heat onto the ceiling and finally on to the room occupants. Traditionally, most of the roofs in the world are made with dark color materials. In summer, the temperature of surface of a black roof can increase as much as 65–90°C. At such a high roof temperatures the deterioration of roofing materials can start and this in turn leads to increased roof maintenance costs, and generation of high levels of roofing waste. To effectively overcome this problem the best solution to reduce this is with the use of radiant barriers, i.e., light colored metallic or non-metallic surfaces which have high solar reflectance and a high emittance to redirect the radiations back to the environment. A cool roof is one that reflects more sunlight and absorbs less heat than a standard roof. In general, cool roofs are made with a highly reflective type of paint or highly reflective tiles or shingles and a covering sheet. Practically, any type of building can be benefited from a cool roof, however, consideration of the climate and other factors are of utmost important before deciding to install one. The present article gives an insight into global roofing market, elastomeric roofing and cool roof coating technology; different cool roof coating materials, relative benefits of cool roof versus conventional roof in terms of energy and cost savings has been discussed at length.

Full Text:

PDF

References


Guidelines for selecting Cool Roof, US Department of Energy, Energy Efficiency & Renewable Energy, July 2010, V.1.2.

www.coolrooftoolkit.org/wpcontent/.../Annie-Cool-roofspresentation-CTICC.pdf.

TECHLINE 11, Cool Reflective Roof Coating, Dow Construction Chemicals, Version 2014.

Elastomer Coating Market-Global Forecasts to 2019, Markets and markets report 2015.

A Practical Guide to Cool Roofs and Cool Pavements, January 2012(coolrooftoolkit.org).

http://coolcolors.lbl.gov/assets/docs/ SRI%20Calculator/SRI-calc10.xls.

Poonia S., Jethoo A.S., Poonia M.P. A short review on energy conservation in buildings using roof coating materials for hot and dry climates, Univ J Environ Res Technol. 2011; 1(3): 247–52p.

Levinson R., Akbari H. Konopecki S. et al Inclusion of cool roofs in

non-residential, Energy Policy. 2005; 33: 151–70p.

http://www.bccresearch.com/pressro om/avm/north-american-roofcoating-sales-reach-$984-million2016.

Cynthia Challencer, COATINSTECH, 44-47, August 2010.

Cool Roofs in APEC Economies: Review of Experience, Best Practices And Potential Benefits, APEC Project EWG11/2009A, December 2011, APEC Publication no. APEC#211-RE-01.11.

Akbari H., Tengfang X., Haider T., et al. Using Cool Roofs to Reduce Energy Use, Greenhouse Gas Emissions, and Urban Heat island Effects: Findings from an India Experiment. Lawrence Berkeley National Laboratory Report, 2011.

Akbari H., Menon S., Rosenfeld A. Global cooling: increasing worldwide urban albedos to offset CO2, Climatic Change. 2009; 95(3– 4.

http://www.vinylroofs.org/wpcontent/uploads/2011/06/aec-coolroofing-course.pdf.


Refbacks

  • There are currently no refbacks.