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A cool roof reduces cooling load by having a high

  • A.solar reflectance
  • B.thermal conductivity
  • C.thermal mass
  • D.surface roughness

Answer: A

Reflecting most of the incident radiation rather than absorbing it keeps the roof surface tens of degrees cooler, and the roof is the surface that receives most sun on a low-rise building. A high emittance in the infrared helps it shed what it does absorb.

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