Roof Cooling With Intermittent Water Sprays

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.

Roof cooling with intermittent water sprays. These systems provide cooling by spraying water on the roof surface. Evaporative cooling technologies such as mist spraying sprinkling of roofs and water spraying onto air conditioner outdoor units were taken up as environment measures for an investigative study. The thermal response of the roof with intermittent stepwise spraying variation is modeled by introducing an equivalent fictitious temperature that accounts for meteorological conditions roof to sky radiation and evaporative effects during roof wetted periods. This cooling reverses the heat flow through the roof.

Yes water on the roof will help cool it. Yes you can spray your roof to help cool it down but that will only cool the shingles for a short time and be a large waste of water. 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. The thermal response of the roof with intermittent stepwise spraying variation is modeled by introducing an equivalent fictitious temperature that accounts for meteorological conditions roof to sky radiation and evaporative effects during roof wetted periods.

The majority of time older homes do not have enough roof vents to help cool the attic in summer. One study indicates that water use is around 100 gallons per day per 1000 sqft of roof area. There should be 1 square foot of vent for every 300 square feet of floor space. 1 gallon of water consumes 8000 btu as it evaporates.

Typical of many cooling or heat gain prevention strategies being employed on innovative buildings in warm climates evaporative spray roof cooling esrc systems not to be confused with roof. Demonstrative experiments using an apartment house confirmed that mist spraying at windows and roof top water. An evaporative roof cooling system is designed to reduce the temperature of a roof from 165 f to about 90 f. Heat is now transferred out of the building through the roof.

This effect creates an effect equivalent of r 7 roof insulation during the day. Cooling with liquid water running off from a sprinkler is not efficient but evaporative cooling from a small amount of water like a periodic sprinkle is very efficient. The effect of intermittent spraying of a building s roof on the cooling load of the building is investigated.