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

  • Carlos A. Domínguez Torres
  • Antonio Domínguez DelgadoEmail author


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.


Energy efficiency Passive cooling Radiative cooling Cool roofs Fluid dynamics 


  1. Goforth MA, Gilcrest GW, Sirianni JD (2002) Cloud effects on thermal downwelling sky radiance. SPIE vol 4710Google Scholar
  2. Gozalbo A, Orts MJ et al (2008) Study of the radiant properties of ceramic tiles. Instituto de Tecnología Cerámica (ITC). Asociación de Investigación de las Industrias Cerámicas (AICE). Universitat Jaume I. (Castellón, España) & KERABEN GRUPO, S.AGoogle Scholar
  3. Hagishima Tanimoto J (2003) Field measurements for estimating the convective heat transfer coefficient at building surfaces. J. Building and Environ 38(7):873–881CrossRefGoogle Scholar
  4. Pisello A, Cotana F (2014) The thermal effect of an innovative cool roof on residential buildings in Italy: results from two years of continuous monitoring. Energy Build 69:154–164CrossRefGoogle Scholar
  5. Synnefa A, Saliari M, Santamouris M (2012) Experimental and numerical assess-ment of the impact of increased roof reflectance on a school building in Athens. Energy Build 55:7–15CrossRefGoogle Scholar
  6. Zinzi M, Romeo C (2010) Cool Roofs case studies in EU level. Intelligent Energy Europe program SAVE 2007Google Scholar

Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  • Carlos A. Domínguez Torres
    • 1
  • Antonio Domínguez Delgado
    • 1
    Email author
  1. 1.Escuela Técnica Superior de Arquitectura de SevillaSevilleSpain

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