Change the material solar and/or visible absorptance to adjust the solar and/or visible reflectance.
For opaque surfaces transmittance = 0 so
Reflectance = 1 - Absorptance
Material,
InsideLayer, !- Name
MediumSmooth, !- Roughness
0.667, !- Thickness {m}
0.115, !- Conductivity {W/m-K}
513, !- Density {kg/m3}
1381, !- Specific Heat {J/kg-K}
0.9, !- Thermal Absorptance
0.78, !- Solar Absorptance
0.78; !- Visible Absorptance
On 11/18/2011 11:48 AM, khkfu wrote:
Hi all
I'm trying to find how to change the reflectance of internal surfaces (I need it for lighting studies). According to the "Engineering Referenc", page 150 "The reflectance values for opaque surfaces are calculated by the program from the Solar Absorptance
and Visible Absorptance values of the outer material layer of the surface's construction." and according to page 136 in "Output Details/Examples": "Reflectance is defined as one minus the thermal
absorptance." explaining the output of the Envelope Summary report.
Could anybody advice in how to change the reflectance of internal surfaces and how it is being calculated in E+
Thnaks
-- Richard A. Raustad Senior Research Engineer Florida Solar Energy Center University of Central Florida 1679 Clearlake Road Cocoa, FL 32922-5703 Phone: (321) 638-1454 Fax: (321) 638-1439 or 1010 Visit our web site at: http://www.fsec.ucf.edu UCF - From Promise to Prominence: Celebrating 40 Years
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