Green Roof Evaporative Cooling

Studies in rio de janeiro have demonstrated that the underside of green roof systems are significantly cooler up to 12 deg c than plain concrete roofs.

Green roof evaporative cooling.

Department of energy the surface of a cool roof reflects more sunlight and releases more heat than a so called hot or dark roof. While the term cool roof is sometimes used to describe any roofing surface that is cooler than a standard rooftop green certification. Set your store to see local availability add to cart. In the simplest form this involves placing a pond on the building roof.

As water evaporates from the pond heat is consumed. Methods of evaporative cooling include roof pond systems which can also lose heat by radiation and convection and water spraying. 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. This cooling reverses the heat flow through the roof.

An evaporative roof cooling system is designed to reduce the temperature of a roof from 165 f to about 90 f. Motor not included model 4001 sd 571 40 571 40. 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 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.

Champion cooler 4600 cfm side draft wall roof evaporative cooler for 1700 sq. Finally the experimental investigation summarizes the benefits of combining green roofs and evaporative and radiant cooling of a water to air heat exchanger as a solution for building cooling and proposes simple equations to anticipate their temperature cooling effects. Rather than absorbing heat as does. Heat is now transferred out of the building through the roof.