What information is needed to calculate the SRI of a material?(choose 2)

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试卷: LEED GA模拟题D[查看]
What information is needed to calculate the SRI of a material?(choose 2)
A: Emissivity
B: Thickness of the material
C: Reflectance
D: Thermal gradient

参考答案: AC

本题解释:
Notes:

Reference: LEED for Existing Buildings: Operations & Maintenance Reference Guide, Glossary

Solar Reflectance Index (SRI) indicates a material\'s ability to reject solar heat and is the combined value of reflectivity and emittance. Measurements vary from 100 (standard white surface, most reflective) to 0 (standard black surface, least reflective). Materials with the highest SRI values are the coolest choices for paving.

The higher the SRI number the more the sunlight the material can reflect. Black asphalt has an SRI of 0.

A:SRI is calculated by using emissivity and solar reflectance values.
B:The thickness of a material is not part of the SRI calculation.
C:SRI is calculated by using emissivity and solar reflectance values.
D: This is outside the scope of LEED. Thermal gradient is the rate of temperature change with distance; for example, its increase with depth below the surface of the earth.