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Determining the infrared reflectance of specular surfaces by using thermographic analysis

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  • Flores Larsen, Silvana
  • Hongn, Marcos

Abstract

Specular surfaces as glass, mirrors and metals are commonly used in solar devices and in building facades. Determining the temperature distribution of such kind of surfaces allows estimating their thermal losses and detecting hot spots and temperature gradients that provokes material stress and rupture. In this sense, thermography is a non-contact measurement technique that is capable to quickly scan and record these surface temperature distributions, but when specular materials are inspected the infrared reflectance becomes a crucial parameter. This work describes a methodology to measure the reflectance of specular materials for different incidence angles in the infrared range 8 μm–14 μm, by using a thermographic camera and an infrared radiation source. The methodology includes the analysis of errors in the estimation of the reflectance and how to select the temperature of the source that minimizes these errors. The method is applied to different specular surfaces commonly used in building facades and solar devices, whose infrared specular reflectances are estimated for different incidence angles. The obtained results are analyzed in order to provide valuable information for in-situ thermographic measurements of specular surfaces.

Suggested Citation

  • Flores Larsen, Silvana & Hongn, Marcos, 2014. "Determining the infrared reflectance of specular surfaces by using thermographic analysis," Renewable Energy, Elsevier, vol. 64(C), pages 306-313.
    • Handle: RePEc:eee:renene:v:64:y:2014:i:c:p:306-313
    DOI: 10.1016/j.renene.2013.11.049
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    References listed on IDEAS

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    1. Asdrubali, Francesco & Baldinelli, Giorgio & Bianchi, Francesco, 2012. "A quantitative methodology to evaluate thermal bridges in buildings," Applied Energy, Elsevier, vol. 97(C), pages 365-373.
    2. Bazilian, Morgan D. & Kamalanathan, Harry & Prasad, D.K., 2002. "Thermographic analysis of a building integrated photovoltaic system," Renewable Energy, Elsevier, vol. 26(3), pages 449-461.
    3. Fokaides, Paris A. & Kalogirou, Soteris A., 2011. "Application of infrared thermography for the determination of the overall heat transfer coefficient (U-Value) in building envelopes," Applied Energy, Elsevier, vol. 88(12), pages 4358-4365.
    4. Lehmann, B. & Ghazi Wakili, K. & Frank, Th. & Vera Collado, B. & Tanner, Ch., 2013. "Effects of individual climatic parameters on the infrared thermography of buildings," Applied Energy, Elsevier, vol. 110(C), pages 29-43.
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    Cited by:

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    2. Dellicompagni, Pablo & Franco, Judith, 2019. "Potential uses of a prototype linear Fresnel concentration system," Renewable Energy, Elsevier, vol. 136(C), pages 1044-1054.

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