Benefits of Cool Roof System for Buildings
Cool roof system for buildings stand for a roofing system that provides superior reflectance as well as thermal emittance. Superior reflectance signifies the capability to the noticeable, infrared and ultraviolet wavelength of the sun, lessening the heat to the building). Superior reflectance signifies the capability to discharge a huge percentage of absorbed, or non-reflected, solar energy.
Cool roof is treated like a useful geo-engineering method to manage global warming on the basis of the norm of solar radiation management, on condition that the materials applied reflect solar energy as well as discharge infra-red radiation to chill the planet.
It is observed that more than 90% of the roofs in the globe are developed with dark color. Under the scorching sun, the temperature concerning the surface of a black roof is raised up to 90 degrees F, getting temperatures of 150-190 degrees F (66 to 88 degrees C).
This augmented heat can result in:
• Application of increased cooling energy and greater utility bills.
• Greater peak electricity demand, enhanced electricity production costs, and a feasibly overloaded power grid.
• Lowered indoor comfort.
• Enhanced air pollution because of the escalation of the “Heat island effect”.
• Rapid decline of roofing materials, enhanced roof maintenance costs, and high levels of roofing waste delivered to landfills.
The energy costs of building are saved immediately and significantly for long term basis with cool roofs. The cool roofs come in different categories like white reflective membranes, coated roofs and planted or green roofs. These roofs can provide the following benefits :-
• Building heat gain is minimized significantly, because a white reflective roof generally gains only 10-25 degrees F over ambient temperature throughout the day.
• Makes savings on summertime air conditioning expenditures.
• Improve the tenure of life concerning both the roof membrane and the building’s cooling equipment.
• Enhance thermal efficiency of the insulation; it happens as the thermal conductivity of the roof’s insulation is enhanced with the increased temperature.
• The demand for electric power is minimized by as much as 10 percent.
• Consequential air pollution and greenhouse gas emission is also decreased.
• Huge energy is saved even in northern climates.