URBAN PASSIVE COOLING. AGING EFFECTS ON OPTICAL PROPERTIES OF ROOF TILES

NOELIA ALCHAPAR; ERICA N. CORREA; ALICIA CANTÓN

Energy Procedia

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2013 vol. 57 p. 1 - 1

1876-6102

When the percentage of solar radiation absorbed by the material of the urban envelope is diminished, its surface temperature can be reduced, thus the heat level is minimized. The application of reflective materials (high albedo) over the surfaces of building envelopes results in an effective passive cooling strategy. This work evaluates the influence of wear on the thermal performance of diverse roof tiles available in the region of Mendoza, Argentina. 16 roof tiles of different characteristics (colour, shape, composition and finish). The effect of aging was quantified by means of the Solar Reflectance Index of each material throughout a period of 3 years. The results obtained have been analyzed by relating the influence of different characteristics of the roof tiles to the thermal behavior of the material throughout time. They show that all the tested roof tiles tend to diminish their ability to reduce urban temperatures by 40%. 50% of clay compositions and 33% of concrete compositions show an SRI value of 30%, as a result of wear.