astm e903-20 standard test method for solar absorptance, reflectance, and transmittance of materials using integrating spheres
ASTM E903-20 Standard Test Method for Determining Solar Absorption, Reflectivity, and Material Transmittance with an Integrating Sphere.
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1.1 This test method consists of measuring the spectral absorption, reflectance, and transmittance of a material using a spectrophotometer equipped with an integrating sphere.
1.2 Specifies the method for calculating the weighted characteristics of the sun based on the measured spectral values.
1.3. This test method is suitable for the optical properties of materials with specular reflection and diffuse reflection.
1.4 This test method is suitable for materials coated with optical coatings, with special consideration for the effect on the texture of the material to be measured.
1.5 The application of this test method should be considered especially for the transmission plate material that is uneven, textured, patterned or corrugated. Test Method 1084 may be more suitable for determining bulk optical properties for textured or inhomogeneous materials.
1.6 For homogeneous materials, this test method is superior to test method 1084.
1.7 This test method refers to an application that uses a standard reference solar spectral distribution, but can be applied using an alternative selection of spectra, as long as the ** and details of the solar spectral distribution and the report are weighted.
1.8 This standard is not intended to address all safety issues, if any, associated with its use. It is the responsibility of the user of this standard to develop appropriate safety, health, and environmental practices prior to use, and to determine the applicability of regulatory restrictions.
1.9 This International Standard has been developed in accordance with internationally recognized principles of standardization in accordance with the decision of the World Organization Committee on Technical Barriers (TBT) on the principles for the development of international standards, guidelines and recommendations.
1.1 this test method covers the measurement of spectral absorptance, reflectance, and transmittance of materials using spectrophotometers equipped with integrating spheres.
1.2 methods of computing solar weighted properties from the measured spectral values are specified.
1.3 this test method is applicable to materials h**ing both specular and diffuse optical properties.
1.4 this test method is applicable to material with applied optical coatings with special consideration for the impact on the textures of the material under test.
1.5 transmitting sheet materials that are inhomogeneous, textured, patterned, or corrugated require special considerations with respect to the applicability of this test method. test methode1084may be more appropriate to determine the bulk optical properties of textured or inhomogeneous materials.
1.6 for homogeneous materials this test method is preferred over test methode1084.
1.7 this test method refers to applications using standard reference solar spectral distributions but may be applied using alternative selected spectra as long as the source and details of the solar spectral distribution and weighting are reported.
1.8 this standard does not purport to address all of the safety concerns, if any, associated with its use. it is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.9 this international standard was developed in accordance with internationally recognized principles on standardization established in the decision on principles for the development of international standards, guides and recommendations issued by the world trade organization technical barriers to trade (tbt) committee.
Both the ASTM E1980 and ASTM E903 standards focus on solar reflectance, and Richdo offers ASTM E1980 solar reflectance and ASTM E903 solar reflectance tests.
astm e1980 standard practice for calculating solar reflectance index of horizontal and low-sloped opaque surfaces.
ASTM E1980 Procedure for Calculating the Reflection Coefficient of Sunlight on Horizontal and Low Inclined Nonheat Transfer Surfaces.
Solar reflectivity and thermal emissivity are important factors affecting the ambient air temperature at and near the surface. The surface of the earth, which has a low solar reflectivity, absorbs most of the incoming solar energy. Part of the absorbed energy is channeled into the ground and buildings, convection with the atmosphere (leading to higher air temperatures), and part radiates into the sky. For equivalent conditions, the lower the emissivity of the surface, the higher its steady-state temperature.
Surfaces with low emissivity do not effectively radiate to the sky and become hot as a result. Determining solar reflectance and thermal emissivity, and subsequently calculating the temperature of the surface relative to the black and white reference temperatures (defined as the Solar Reflectance Index, SRI), can help designers and consumers select the right materials to make their buildings and communities energy efficient.
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