Assessment of the Energy Efficiency of a “Cool Roof” for Passive Cooling. Comparative Study of a Case of Tropical Climate and a Case of Southern Spanish Climate
The aim of this study is to analyze the energy efficiency resulting from the use of a type of Cool Roof under climatic conditions operating in Southern Spain and Northern Colombia during the whole year by using typical meteorological monthly data. Specifically, the thermodynamic behaviors of a Cool Roof and a standard roof are compared in two climatic and geographical frameworks that might suggest the use of this kind of roofs: the Mediterranean climate in Southern Spain and the Tropical Equatorial climate in Northern Colombia. Cool Roofs are an affordable technology because the materials used are simple and easily available, such as paints, tiles and membranes and they provide a great rate of return as its use can significantly reduce cooling energy costs during the summer period in South European areas or even during the whole year in Tropical Climatic areas. From the energy performance analysis made for the considered roofs, that is, the Cool Roof and a roof with a external layer of ceramic tiles, we conclude that in the case of Southern Spain the energy savings achieved during the hot season are counterbalanced by an increase of the heating charge in the cold season, although the global energy balance is favorable for the Cool Roof. In the case of the considered equatorial climate, the global energy balance is clearly favorable for the Cool Roof since it achieves a substantial reduction in energy consumption when compared to the standard ceramic tiles roof.
KeywordsEnergy efficiency Passive cooling Radiative cooling Cool roofs Fluid dynamics
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