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Tuesday, 04 January 2011 00:00 |
Solar Roof Restorations with SuperTherm®
Reflect 95% of Solar Heat Load
Save 30%-70% of Energy
"Deferred Maintenance is Not Prudent when it comes to roofs".
SuperTherm® Cool Roof Restoration System can restore many existing roofs for a fraction on replacing them while providing Energy Savings, Tax Credits and a 10 year warranty.
Now more than ever before, facility managers, building owners and contractors are required to find affordable ways to maintain their buildings and save money. This often results in deferring proper maintenance and replacement in order to balance ever shrinking budgets. Unfortunately, deferring roof repairs that are failing now is not prudent
SuperTherm® can help address the problem of "heat Island effect" which results in part from the combined heat of numerous individual hot roofs in a city, a suburb or on a campus. SuperTherm® is made of a blend of ceramic compounds that are highly reflective and emissive materials and can remain approximately 60 to 70°F cooler than traditional materials during peak summer weather. Traditional dark colored roofs in the United States will have temperatures of 150 to 185°F during moderately warm (85-90°) days of summer which results in a series of hot surfaces that create warmer surrounding air temperatures which require a tremendous amount of energy to cool.
SuperTherm® is a Cool Roof Restoration System.
"Cool roofing" refers to the use of highly reflective and emissive materials.
"Green roofs" refer to rooftop gardens. Solar Reflectance and Thermal Emittance are terms often used to evaluate cool roofs.
Solar reflectance, or albedo, is the percentage of solar energy reflected by the surface. Traditional roofing materials have low solar reflectance of 5 to 15%, which means that that they absorb 85 to 95% of the energy reaching them instead of reflecting the energy back out to the atmosphere. The coolest roof materials have a high solar reflectance of more than 65%, absorbing and transferring to the building 35% or less of the energy that reaches them. SuperTherm® reflects radiation across the entire solar spectrum: 99% of Ultraviolet (UV), 92% of Visual Light (Short Wave Radiation) and 99.5% of Infrared (Long Wave Heat Radiation).
SuperTherm® has an initial Solar Reflectance (SRI) of 92.2%. The reduction of solar reflectance in 3 years as tested for the Energy Star Program by the EPA was only a remarkable 0.01%.
Emissivity and Thermal Emittance.
"When radiation falls on a body, the
body will warm up until it emits as much heat as it absorbs and the stops warming, reaching a state of thermal equilibrium. If the heat loss by the body takes place in empty space, the only way in which the body can lose heat is through radiation. In that case, its radiated energy flux will be equal to the absorbed flux.
Reflectivity = 1- Absorptivity
What this means is that if all energy is reflected, no energy is left to be absorbed.
Absorptivity = Emissivity
What this means is that the only absorbed energy is emitted.
So if there was no absorption of energy, there would be no emission of energy either.
...As a point of reference, emissivity refers to the properties of a material; emittance to the properties of a particular object that depends on the shape of the object, oxidation, and surface finish. As an example, if a shiny metal surface which has a low emissivity is oxidized and gets dirty, its emissivity remains the same but its emittance becomes very high"
-Inn Choi, PhD.
"Super Therm® reflects 95% of all radiation allowing only 5% heat load. Super Therm® repels (throws off) 90% of the 5% heat load from the surface"
-J.E. Pritchett
Super Therm® has a Thermal Emittance of 0.91
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Air Temperature at Time of test 62°F
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Solar reflectance and thermal emittance have noticeable effects on surface temperatures.
Conventional roof surfaces have low reflectance but high thermal emittance; standard black asphalt roofs can reach 170- 185F at midday during the summer. Bare metal or metallic surfaced roofs have high reflectance and low thermal emittance and can warm to 155 to 170°F. Super Therm® coated roofs with both high reflectance and high emittance remain within 5% of ambient temperature and reach peak temperatures of only 95 to 105% in the summer sun. The peak values vary by local conditions. However, research has proven that conventional roofs can be 55 to 85F hotter than the air on any given day, while SuperTherm® Cool Roof Systems stay within 5-10F of ambient temperature.
Super Therm®Cool Roof Systems bring many benefits to facility managers and building owners including: Lowering Energy Use, Reducing Air Pollution and Green House Gas Emissions and Improved Human Health and Comfort.
- Transfer less heat into the building below, so the building stays cooler and more comfortable and uses less energy for cooling.
- Is a superior solution to insulation requirements with the ability to protect form all 3 methods of heat transfer. 10 mils of Super Therm® provides the same protection as 6 inches of fiberglass.
- Blocks water and moisture penetration
- Blocks air infiltration
- Blocks Flame Spread and Smoke-Class "A" Fire Rating
- Certified Environmentally Safe and Healthy and Energy Efficient with Eco-Friendly Design. Cradle to Cradle Design Certification "Gold" by MBDC.
Super Therm®Cool Roof Systems
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Comments
what types of roofs can be covered with the product and what is the expected life?
Different roofing sytems require slightly different preparation and application steps.
Super Therm has had excellent test results in the field after 15 years (and still going) in extremely severe conditions to remain at 84.1% of visible light reflectance, 73% of totla solar reflectance and 65% of infrared.
Super Therm has also been tested by the EPA for the Energy Star Program to have a reduction of Solar Reflectance of only 0.01% after 3 years
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