Green Roof Evaporative Cooling

This effect creates an effect equivalent of r 7 roof insulation during the day.

Green roof evaporative cooling.

It should be noted that the minimum underside temperature during night time does not fall as much in a green roof system as the growth medium acts as an insulator 3. A cool roof is a roof designed to maintain a lower surface temperature in bright sunshine than a traditional roof source. Methods of evaporative cooling include roof pond systems which can also lose heat by radiation and convection and water spraying. Department of energy the surface of a cool roof reflects more sunlight and releases more heat than a so called hot or dark roof.

As water evaporates from the pond heat is consumed. A concentration of green roofs in an urban area can even reduce the city s average temperatures during the summer combating the urban heat island. In the simplest form this involves placing a pond on the building roof. This cooling reverses the heat flow through the roof.

While the term cool roof is sometimes used to describe any roofing surface that is cooler than a standard rooftop green certification. An evaporative roof cooling system is designed to reduce the temperature of a roof from 165 f to about 90 f. A green roof reduces cooling by evaporative cooling loads on a building by fifty to ninety percent especially if it is glassed in so as to act as a terrarium and passive solar heat reservoir. Heat is now transferred out of the building through the roof.

Motor not included model 4001 sd 571 40 571 40. This cools the roof which acts as a heat sink and absorbs heat from the. Champion cooler 4600 cfm side draft wall roof evaporative cooler for 1700 sq. Rather than absorbing heat as does.