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RE: [EnergyPlus_Support] SRI/Refelectivity study
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- Subject: RE: [EnergyPlus_Support] SRI/Refelectivity study
- From: "Griffith, Brent" <brent.griffith@xxxxxxxx>
- Date: Thu, 4 Oct 2012 13:52:40 -0600
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- Thread-topic: [EnergyPlus_Support] SRI/Refelectivity study
For a so-called ?cool roof? change the Material object that is outermost in the Construction object for the roof. The values to use depend on dirt accumulation, age, type of coating etc, but I usual values are a solar absorptance of 0.45 and a thermal absorptance of 0.75 ( from ASHRAE 90.1-2007 Table 11.3.1 No. 5.c) .
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Javed Iqbal
Sent: Thursday, October 04, 2012 1:24 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] SRI/Refelectivity study
Thanks for your response. I found a document on Cool roof and it says:
"The most important feature of an ideal cool roof is that its surface strongly reflects sunlight.
The surface of an ideal cool roof should also efficiently cool itself by emitting thermal radiation.
Thus, a cool roof should have both high ?solar reflectance? (ability to reflect sunlight, measured
on a scale of 0 to 1) and high ?thermal emittance? (ability to emit thermal radiation, also
measured on a scale of 0 to 1). The solar reflectance and thermal emittance of a surface are
called its ?radiative? properties because they describe its abilities to reflect solar radiation and
emit thermal radiation".
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