Savings on air-conditioning electricity
To find out annual Savings (cost of a/c) http://www.roofcalc.com/ or http://www.ornl.gov/sci/roofs%2Bwalls/facts/CoolCalcEnergy.htm
- Energy efficiency can also increase profits by reducing costs.
- Reduce air conditioning use, resulting in energy savings typically of 15-20% or more.
- “Up to 15% of air-conditioning bill” Progress EnergyFlorida.
- Reduce the annual air-conditioning energy use by 15-20% on a single-story building. In the summer time they can use 35% less electricity. On high rise buildings it lowers Heat Island Effect or “urban heat island”. Air temperatures in many urban and suburban areas are higher than those in their rural surroundings: this regional elevation in air temperature is called an “urban heat island”. White roofs save energy by strongly reflecting sunlight (high solar reflectance) and efficiently emitting thermal radiation (high thermal emittance). Solar reflectance is the fraction of sunlight that is reflected. Thermal emittance is the efficiency with which a surface cools itself by emitting thermal radiation.
- “Because Cool Roofs reduce air-conditioning use during the day’s hottest periods, the associated energy savings occur when the demand for electricity is at its peak. Therefore, use of Cool Roofs reduces the stress on the energy and helps avoid shortages that can cause blackouts or brownouts. In addition, for buildings owners that pay for their energy based on the time of use, they save money when it is at its most expensive and hence, save more money.”
- Increase of life of air conditioners by 15-20%.
