Solar Reflectance Performance of Roof Coverings in Istanbul; Turkey

Sinem Kultur
Bahcesehir University, Istanbul, Turkey

Nil Turkeri
Istanbul Technical University, Istanbul, Turkey

Ladda ner artikelhttp://dx.doi.org/10.3384/ecp110571978

Ingår i: World Renewable Energy Congress - Sweden; 8-13 May; 2011; Linköping; Sweden

Linköping Electronic Conference Proceedings 57:31, s. 1978-1985

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Publicerad: 2011-11-03

ISBN: 978-91-7393-070-3

ISSN: 1650-3686 (tryckt), 1650-3740 (online)


Cooling energy load can be reduced by reflective roofs. The reflective roofs are recognized by Turkish architects; contractors and manufacturers; however; the solar reflectance performance of new and aged roof coverings produced in Turkey is still unknown. Purpose of this paper is to assess short-term and long-term solar reflectance performance of these roof coverings. In this context; solar reflectance measurements were conducted both in laboratory and in field. Firstly; solar reflectance performance of 13 unexposed test samples including clay; cement; bituminous and metal based was measured in laboratory. Then; 6 of these test samples were exposed to simulated solar radiation for a duration that is equivalent to 1-year exposure. The laboratory measurements indicated that white and shiny ceramic tile is the most reflective covering while black corrugated sheet is the most absorptive one. Secondly; two test specimens (red clay tile and bituminous shingle covered surfaces) with an automated weather observation system were set up in a field in order to measure the solar reflectance performance of the roof surfaces. The initial results demonstrated that the clay tile-covered roof surface had higher reflectance values. This paper will enable designers to choose the roof covering appropriate for reflective roofs that can be used to rehabilitate existing roof coverings or to design new roofs.


Solar reflectance performance; Roof covering; Reflective roof


[1] American Society for Testing and Materials. (1996). Standard Test Method for Solar Absorptance; Reflectance and Transmittance of Materials Using Integrated Spheres. ASTM Standards; E 903. USA: ASTM International.

[2] American Society for Testing and Materials. (2001). Standard Practice for Operating Xenon Arc Light Apparatus for Exposure of Non-Metallic Materials; ASTM Standards; G 155; USA: ASTM International.

[3] American Society for Testing and Materials. (2006). Standard Test Method for Measuring Solar Reflectance of Horizontal and Low Sloped Surfaces in the Field. ASTM Standards; E 1918. USA: ASTM International.

[4] Liu; K. (2005). Towards Sustainable Roofing. Institute for Research in Construction. Canada; ; accessed on 20.04.2009.

[5] Ozturk; M. (2008). Egimli Çatilarda Nihai Çati Kaplama Malzemeleri 2007 Yili Sektör Büyüklügü Arastirmasi. 4. Ulusal Çati & Cephe Kaplamalarinda Çagdas Malzeme ve Teknolojiler Sempozyumu (s. 115-120). Istanbul: Altan Basim Ltd..

[6] Parker; D.S.; Barkaszi; S.; Chandra; S. and Beal; D.J. (1995). Measured cooling energy savings from reflective roofing systems in Florida: field and laboratory research results. Report No: FSEC-PF-293-95 Florida Solar Energy Center; FL.

[7] Prado; R. and Ferreira; F. (2005). Measurement of albedo and analysis of its influence the surface temperature of building roof materials. Energy and Buildings; 37; 295-300. doi: 10.1016/j.enbuild.2004.03.009.

[8] The Ministry of Environment and Foresty. (2007). First National Communication on Climate Change. ; accessed on 15.03.2007.

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