Green Roof Evaporative Cooling

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Green roof evaporative cooling.

In the simplest form this involves placing a pond on the building roof. A cool roof is a roof designed to maintain a lower surface temperature in bright sunshine than a traditional roof source. Rather than absorbing heat as does. While the term cool roof is sometimes used to describe any roofing surface that is cooler than a standard rooftop green certification.

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. This effect creates an effect equivalent of r 7 roof insulation during the day. This cooling reverses the heat flow through the roof. Methods of evaporative cooling include roof pond systems which can also lose heat by radiation and convection and water spraying.

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. 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. 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. As water evaporates from the pond heat is consumed.

This cools the roof which acts as a heat sink and absorbs heat from the. Set your store to see local availability add to cart. 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. An evaporative roof cooling system is designed to reduce the temperature of a roof from 165 f to about 90 f.