hardwood solar reflectance and emmissivity

Evaluation of reduction effect on thermal load inside and outside of

Table 1 lists the density, specific heat, thermal conductivity, solar reflectance, and infrared emissivity. Here, the values of solar reflectance of wood and concrete are measured data, while those of infrared emissivity are assumed. The other values of wood are measured data. The values of concrete and air are from literature

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Solar Reflectance Index (SRI) - OrganoWood

Solar reflectance. Emissivity. Surface temperature (K). OrganoWood. 82,4 ±3. 0,67 ±0,02. 0,93 ±0,04. 324,4 ±1,5. Comment: The stated uncertainties do not include possible variations in the wood surface. The reported expanded uncertainty of measurement is stated as the standard uncertainty of measurement multiplied by

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Solar Reflectance Index – The World's Best Roofing Blog

Jan 20, 2010 SRI combines reflectivity and emittance to measure a roofs overall ability to reject solar heat. The calculation of this index is defined by ASTM E 1980-01 and is based on some rather complicated math that includes values for solar absorptance, solar flux, thermal emissivity, the Stefan Boltzmann constant,

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Cool Roof - CSAIL People - MIT

Rating Council. The Cool Roof Rating Council (CRRC) "is an independent, non-profit organization that maintains a third-party rating system for radiative properties of roof surfacing materials." Solar reflectance and thermal emittance are measured and certified for roof products both new and after 3 years of outdoor exposure

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The Solar Reflectance Index as a Tool to Forecast the Heat - MDPI

Feb 15, 2018 Keywords: ageing; emissivity; measurement; solar reflectance; solar reflectance index; thermal emittance; urban heat island. 1. Introduction. Overheating of buildings and urban areas is a more and more severe issue due to increasing urbanization combined with global warming. In fact, 54% of the world's

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Solar Reflectance - Portland Cement Association

This report presents the results of solar reflectance testing on 135 concrete specimens from 45 The lowest solar reflectances were from concretes composed of dark gray fly ash. The solar reflectance of the cement had more effect on the solar reflectance of the concrete Emissivity is a property of a material, and.

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Laboratory Testing of the Reflectance Properties of Roofing Materials

Products 69 - 81 Figure 2 depicts small 1 x 2" sections of several of the shingles. The test results for the shingle samples are provided in Table 1. Table 1. Reflectance and Emittance Properties of Asphalt Shingles. Shingle Color. Reflectances %. Far Infrared. Emittance. Solar. UV. VIS. NIR. Aspen Gray. Weathered Wood.

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SRI Reflectance and Emittance Values for Gravel Poplar Network

Jul 9, 2013 Hi Rob, thanks for your question on SRI, reflectance and emittance values for gravel. For those who aren't aware, SRI stands for Solar Relectance Index, and is a combination of both solar reflectance, also known as albedo, and thermal emittance, or emissivity. Albedo is the ability of a material to reflect

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Confirmatory Testing of Expanded Polystyrene (EPS - Accoya Wood

Jul 11, 2014 Report of Testing Accoya? Wood for compliance with the applicable requirements of the Solar Reflectometer. ASTM. E1980-11 Standard Practice for Calculating Solar Reflectance Index of . Using the solar reflectance and thermal emissivity of the specimen surface, the SRI is calculated on three

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Building on Solar Reflectance: Meeting cool roof standards with

Mar 7, 2017 The Solar Reflectance Index (SRI) has become the chief quantitative measure used to define cool roof materials. The ability of a roofing material to reflect incoming radiation (i.e. reflectivity) and shed heat back to the exterior (i.e. emissivity) is measured using standard procedures, and expressed as a single,

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