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RE: [EnergyPlus_Support] Interior Shade



Peter,

The diffuse assumption applies only to shade material (i.e., shade material,
like venetian blind slats are assumed to reflect purely diffusely).
However, there is still beam component of solar radiation that goes through
the shades undisturbed (e.g., open or partially open venetian blinds).  Even
if nothing is directly transmitted through the shade, there is beam and
diffuse incident radiation, which becomes all diffuse after the solar beam
hits the shade.  Therefore, simulation takes into account both direct and
diffuse.  The simplifying assumption here is diffuse (Lambertian)
reflectance of shading material, which for some highly specular materials
(i.e., metallic venetian blinds) may be oversimplifying, but at the time
there is no correction for specularity of material.

Charlie

-----Original Message-----
From: Peter G Loutzenhiser [mailto:post@xxxxxxxxxxx] 
Sent: Thursday, March 16, 2006 7:15 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Interior Shade

Dear All,

When EnergyPlus simulates an interior shades for windows, is the initial
beam radiation component transmitted through the glazing unit/window
angular dependent and then a geometric series used assuming infinitely long
flat plates.  The Engineering manual leads me to believe that only diffuse
solar transmittances and reflectances are used to calculate the overall
transmittance of the blind+glazing unit/window , but I am unsure.

Regards,
Peter



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