Roof Surface Evaporative Cooling

This surface will be only 9 f warmer than the outside air on a typical summer afternoon.

Roof surface evaporative cooling.

Champion cooler 6500 cfm side draft wall roof evaporative cooler for 2300 sq. An evaporative roof cooling system is designed to reduce the temperature of a roof from 165 f to about 90 f. A roof with a clean smooth bright white surface can reflect about 85 of incident sunlight and emit thermal radiation with 90 efficiency. In warm climates evaporative spray roof cooling esrc systems not to be confused with roof ponds.

One study indicates that water use is around 100 gallons per day per 1000 sqft of roof area. This sets up a temperature gradient between the inside air and outside roof surface resulting in loss of heat from the inside to outside. This effect creates an effect equivalent of r 7 roof insulation during the day. This cooling reverses the heat flow through the roof.

Motor not included model 5000 sd 684 28 684 28. A better way to cool the roof is to change its color. Heat is now transferred out of the building through the roof. An evaporative cooling system consists of an intake chamber filter s supply fan direct contact or indirect contact heat exchanger exhaust fan water sprays re circulating water pump and water sump.

You can usually make a new or existing roof cool by selecting the appropriate surface. 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. Evaporative cooling is one of the well known techniques to cool the roof surface resulting in the reduction of thermal load of the building. 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.

Coatings are like very thick paints that can protect the roof surface from ultra violet uv light and chemical damage and some offer water protection and restorative features. Cool roof coatings are white or special reflective pigments that reflect sunlight. They are simple and appear to be effective but would not be a good choice in areas where water is in short supply. These systems provide cooling by spraying water on the roof surface.

Evaporative cooling systems are characterised by low energy use compared with refrigeration cooling. During a shower or artificial watering the porous construction material of a roof absorbs some water depending on its water holding capacity. Set your store to see local availability add to cart.