A cool roof is a roof designed to maintain a lower surface temperature in bright sunshine than a traditional roof source.
How cool roof mechanism works.
A small fraction less than 10 arrives as invisible ultraviolet light.
Buy cool asphalt shingles which use specially coated granules that provide better solar reflectance.
Although cool roofing is one of the most significant green technologies today it is not a new concept.
Historically cool roofs have been either white.
By doing this cool roofs allow for a more comfortable and controlled indoor environment.
With a typical split system the condenser and the compressor are located in an outdoor unit.
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Evaporative cooling differs from typical air conditioning systems which use vapor compression or absorption refrigeration cycles.
The evaporator is mounted on or in the air handling unit which is often a forced air furnace.
Coating existing asphalt shingles to make them cool however is not normally recommended or approved by shingle manufacturers.
How solar reflective roofing works whereas darker traditional roofing materials absorb sunlight the reflective surfaces of a cool roof reflect it away.
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.
Solar energy is composed of ultraviolet uv rays visible light and infrared energy.
With a package system all of the components are combined in a single outdoor unit that may be located on the ground or on the roof.
To understand how roofs can keep cool in the sun you need to first understand solar energy.
While the term cool roof is sometimes used to describe any roofing surface that is cooler than a standard rooftop green certification.
Science of cool roofs how do cool roofs work.
Slightly less than half of sunlight is visible.
Department of energy the surface of a cool roof reflects more sunlight and releases more heat than a so called hot or dark roof.
A cool roof prevents heat absorption by reflecting the sun s heat and then emitting its radiation back into the atmosphere.
Roof temperature is rated via solar reflectance and thermal emittance with ratings ranging between 0 and 1.
Evaporative cooling uses the fact that water will absorb a relatively large amount of heat in order to evaporate.
Shingle roofs consist of overlapping panels made from a variety of materials such as fiberglass asphalt wood polymers or metals.
The cool roof rating council accepts test reports from approved testing laboratories and then compiles the information in an easily accessed database.
How they can be made cool.
With warehouses or large manufacturing facilities we can use misting lines or misting fans.
Cool large spaces at a small fraction of the cost of a c with evaporative cooling.
An evaporative cooler also swamp cooler swamp box desert cooler and wet air cooler is a device that cools air through the evaporation of water.
The cool roof rating council is a not for profit organization that validates the reflective and emissive properties of cool roof products.
