The aim of this QUALICHeCK webinar, which will take place on Wednesday 28 September 2016, 10:00 am Brussels time (CET), is to outline the efforts performed in the European context for the promotion of cool roofs, including aspects of compliance and quality of the works.
Increased urban temperatures have an important impact on the energy consumption of buildings mainly during the summer period. The urban heat island is the most documented phenomenon of climatic change. The heat island is related to the increase of urban temperatures compared to the suburban areas because of the positive heat balance.
Rejection of solar gains is the aim of passive cooling strategies in any type of building and any climatic region. Cool materials work by reflecting solar radiation and therefore rejecting solar heat gains at the opaque external surfaces of the building. Heat transfer to the internal space by conduction is therefore reduced, while the magnitude of the reduction will be determined mainly by the solar radiation intensity, the temperature difference between inside and outside, as well as the constructional characteristics of the roof. The extent of cool materials usefulness is dependent on the severity of external conditions and internal heat gains.
The effect of cool materials in hot climatic conditions are studied by various researchers. In most cases a reduction of the cooling load of almost 20-40% is revealed by the application of cool roofs while a considerable indoor comfort improvement is noticed. Moreover, the energy efficiency attributed to cool roofs ranges between 2.5-10 kWh/m² (with average of 6.25 kWh/m²) of roof. For houses and offices that are not air conditioned, cool-coloured roofing materials offer comfort, typically at very reasonable costs. Assuming an emission rate of 750 gCO2/kWh of electricity savings, the annual CO2 savings ranges from 1.9 to 7.5 kg/m² of roof area with 4.7 kg/m² of roof surface as an average.
For further information on registration, agenda, etc., please visit the event’s webpage at the link below.