Cool Roof Technology Abstract

Thermal comfort improves by 2 5 c but heating demand increases by 10.

Cool roof technology abstract.

Cool roofs is a green building technology that is especially suited to the climate of the india. When working to meet local environmental mandates the priority is to choose a cool roof that meets regional and or green rating council requirements. A cool roof is a roofing system that delivers higher solar reflectance the ability to reflect the visible infrared and ultraviolet wavelengths of the sun reducing heat transfer to the building and higher thermal emittance the ability to radiate absorbed or non reflected solar energy than standard designed roofing products. As a general guideline if a low slope roofing system meets california title 24 requirements it will also meet the leed and energy.

Cool roofs can be made of a highly reflective type of paint a sheet covering or highly reflective tiles or shingles. Roof reflectivity of 0 6 0 7 is optimum for london climate. Highlights we studied the energy impact of a cool roof in an office building in london. Studies have isolated and evaluated the effects of climate surface reflectivity and roof insulation on energy savings thermal load mitigation and also ameliorating the urban heat.

A cool roof prevents heat absorption by reflecting the sun s heat and then emitting its radiation back into the atmosphere. In light of this cool roofing is one of the main strategies used to prevent future occurrences of heat island effects cool roofing is an emergent and powerful technology used for temperature control of buildings and areas. Highly reflective roofing systems have been analyzed over several decades to evaluate their ability to meet sustainability goals including reducing building energy consumption and mitigating the urban heat island. Advances in building energy research.

Standard or dark roofs can reach temperatures of 150 f or more in the summer sun. Commercial buildings are benefiting from cool roof savings throughout the usa even in northern climates and that is fundamentally shifting the roofing marketplace. The cool roof rating council was created in 1998 to develop accurate and credible methods for evaluating and labeling the solar reflectance and thermal emittance radiative properties of roofing products and to disseminate the information to all interested parties. A cool roof under the same conditions could stay more than 50 f cooler and save energy and money by using less air conditioning.

The study includes experiments and thermal modelling. Impact of cool roofs on cooling system efficiency. Overall energy demand reduces between 1 and 8 5 relative to an albedo of 0 1. Yet you may not be familiar with what exactly the term means so let s give you a quick primer on cool roof technology with a special emphasis on its suitability in the indian context.

It is a relatively cheap option with substantial benefits. Active cool roof effect. What to look for when selecting a cool roof technology. Historically cool roofs have been either white.

7 mitigating urban heat island using cool roof technologies pp.