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Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low-Sloped Opaque Surfaces
Automaticky preložený názov:
Štandardné praktiky pre výpočet slnečné odrazivosť Index horizontálnych a Low-šikmých nepriehľadné povrchy
NORMA vydaná dňa 10.4.2001
Označenie normy: ASTM E1980-11
Poznámka: NEPLATNÁ
Dátum vydania normy: 10.4.2001
Kód tovaru: NS-43826
Počet strán: 3
Približná hmotnosť: 9 g (0.02 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
solar flux, solar reflectance, solar reflectance index, thermal emittance, Horizontal surfaces, Low-sloped surfaces, Opaque surfaces, Solar reflectance, ICS Number Code 17.180.20 (Colours and measurement of light)
Significance and Use | ||
Solar reflectance and thermal emittance are important factors affecting surface and near-surface ambient air temperature. Surfaces with low solar reflectance, absorb a high fraction of the incoming solar energy. A fraction of this absorbed energy is conducted into ground and buildings, a fraction is convected to air (leading to higher air temperatures), and a fraction is radiated to the sky. For equivalent conditions, the lower the emissivity of a surface the higher its steady-state temperature. Surfaces with low emissivity cannot effectively radiate to the sky and, therefore, get hot. Determination of solar reflectance and thermal emittance, and subsequent calculation of the relative temperature of the surfaces with respect to black and white reference temperature (defined as Solar Reflectance Index, SRI), may help designers and consumers to choose the proper materials to make their buildings and communities energy efficient. The method described here gives the SRI of surfaces based on measured solar reflectances and thermal emissivities of the surfaces. |
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1. Scope | ||
1.1 This practice covers the calculation of the Solar Reflectance Index (SRI) of horizontal and low-sloped opaque surfaces at standard conditions. The method is intended to calculate SRI for surfaces with emissivity greater than 0.1. 1.2 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 and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||
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1.6.2011
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