There should be 1 square foot of vent for every 300 square feet of floor space.
Roof cooling with intermittent water sprays.
1 gallon of water consumes 8000 btu as it evaporates.
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.
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.
Roof cooling with simple way can make it with yourself.
These systems provide cooling by spraying water on the roof 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.
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.
Heat is now transferred out of the building through the roof.
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 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.
One study indicates that water use is around 100 gallons per day per 1000 sqft of roof area.
They are simple and appear to be effective but would not be a good choice in areas where water is in short supply.
This effect creates an effect equivalent of r 7 roof insulation during the day.
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.
Demonstrative experiments using an apartment house confirmed that mist spraying at windows and roof top water.
The majority of time older homes do not have enough roof vents to help cool the attic in summer.
The effect of intermittent spraying of a building s roof on the cooling load of the building is investigated.
The water evaporates and cools the surface.
This cooling reverses the heat flow through the roof.
