The increase of peak and energy demand during the cooling season is becoming a crucial issue, as well
as the intensification of the urban heat island effect. This trend is observed at several latitudes, including
areas where overheating was unknown at building and urban levels. This phenomenon involves different
issues: reduction of greenhouse gases, quality and comfort in outdoor and indoor environment, security
of energy supply, public health. The building sector is directly involved in this change and adequate
solutions can provide great benefit at energy and environmental levels. Roofs in particular are envelope
components for which advanced solutions can provide significant energy savings in cooled buildings
or improve indoor thermal conditions in not cooled buildings. Cool materials keep the roof cool under
the sun by reflecting the incident solar radiation away from the building and radiating the heat away
at night. Roofs covered with vegetation take benefits of the additional thermal insulation provided by
the soil and of the evapo-transpiration to keep the roof cool under the sun. These two technologies
are different in: structural requirements, initial and lifetime maintenance costs, impact on the overall
energy performance of buildings. This paper presents a numerical comparative analysis between these
solutions, taking into account the several parameters that affect the final energy performances. By means
of dynamic simulations, the paper depicts how cool and green roofs can improve the energy performance
of residential buildings in different localities at Mediterranean latitudes
The increase of peak and energy demand during the cooling season is becoming a crucial issue, as wellas the intensification of the urban heat island effect. This trend is observed at several latitudes, includingareas where overheating was unknown at building and urban levels. This phenomenon involves differentissues: reduction of greenhouse gases, quality and comfort in outdoor and indoor environment, securityof energy supply, public health. The building sector is directly involved in this change and adequatesolutions can provide great benefit at energy and environmental levels. Roofs in particular are envelopecomponents for which advanced solutions can provide significant energy savings in cooled buildingsor improve indoor thermal conditions in not cooled buildings. Cool materials keep the roof cool underthe sun by reflecting the incident solar radiation away from the building and radiating the heat awayat night. Roofs covered with vegetation take benefits of the additional thermal insulation provided bythe soil and of the evapo-transpiration to keep the roof cool under the sun. These two technologiesare different in: structural requirements, initial and lifetime maintenance costs, impact on the overallenergy performance of buildings. This paper presents a numerical comparative analysis between thesesolutions, taking into account the several parameters that affect the final energy performances. By meansof dynamic simulations, the paper depicts how cool and green roofs can improve the energy performanceof residential buildings in different localities at Mediterranean latitudes
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