An evaporative roof cooling system is designed to reduce the temperature of a roof from 165 f to about 90 f.
Roof water cooling system.
They are simple and appear to be effective but would not be a good choice in areas where water is in short supply.
John estimates that his systems saves about 5kwh per day on his cooling bill.
David s north carolina system.
John s nebraska system.
Roof sprinklers work by spraying water at predetermined intervals on a roof s surface.
This cooling reverses the heat flow through the roof.
The water evaporates and cools the surface.
Also called an evaporative cooling system a roof misting system lowers surface temperatures by spraying an extremely small amount of water across the roof allowing the water to cool the roof as it evaporates.
Heat is now transferred out of the building through the roof.
These systems provide cooling by spraying water on the roof surface.
This effect creates an effect equivalent of r 7 roof insulation during the day.
As the water evaporates it cools the roof and helps to lower the temperature of the roof tiles and the ceiling cavity beneath it.
Dark surfaces also contribute to the urban heat island effect.
One study indicates that water use is around 100 gallons per day per 1000 sqft of roof area.
The principle is similar to the way the human body cools itself with perspiration.
The built in thermostat monitors the roof temperature constantly and activates mist when needed this helps keep your roof temperature normal and saves water as well.
A cool roof reflects the sun s energy reducing rooftop temperatures.