Roof Water Cooling System

Dark surfaces also contribute to the urban heat island effect.

Roof water cooling system.

This cooling reverses the heat flow through the roof. They are simple and appear to be effective but would not be a good choice in areas where water is in short supply. A cool roof reflects the sun s energy reducing rooftop temperatures. An evaporative roof cooling system is designed to reduce the temperature of a roof from 165 f to about 90 f.

The water evaporates and cools the surface. The principle is similar to the way the human body cools itself with perspiration. One study indicates that water use is around 100 gallons per day per 1000 sqft of roof area. John s nebraska system.

While a sunlight absorbing black roof can reach up to 190 f in the summer a reflective roof s temperature can be as much as 60 f lower. Roof sprinklers work by spraying water at predetermined intervals on a roof s 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. David s north carolina system.

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. These systems provide cooling by spraying water on the roof surface. John estimates that his systems saves about 5kwh per day on his cooling bill. As the water evaporates it cools the roof and helps to lower the temperature of the roof tiles and the ceiling cavity beneath it.

At its lowest tech a roof misting system can be little more than a garden hose set to the mist setting and aimed across the roof.