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RE: [EnergyPlus_Support]
I think the answer depends on your shading device. The glass
calculations will determine shading based on any incident angle and will
be uniform for all angles off of normal to the glass. If your shading
device is a slat, it has directional components that are not calculated
for glazing. If your device is a perforated or translucent, flat
screen, than it may perform more like a glazing system. Also for
glazing, the reflection tends to increase as the angle from normal
increases. This is built into the default handling of glass and can be
handled in greater detail with glass input from WINDOW 5. This may not
be true for your shade device. It should be possible to make WINDOW 5
accept a layer with your shading device if it is unidirectional, in
which case the total glazing properties imported into the model may be
correct. Finally, internal shades perform differently than external
shades. An internal shade has a component of load to the room that is
not present with an external shade.
Ned Lyon, Senior Project Manager
Simpson Gumpertz & Heger Inc.
41 Seyon Street, Bldg 1 Suite 500
Waltham, Massachusetts 02453
781-907-9350 direct
________________________________
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Peter G.
Loutzenhiser
Sent: Thursday, August 25, 2005 08:17
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support]
Dear All,
I am curious about what the assumption are in EnergyPlus with regard to
windowglass inputs and what assumptions one can make. For instance, I
see that
one can specify solar diffusing; if I have a shading device where I have
the
spectral data, can I input it as a solar diffusing piece of glass or
will the
algorithms for angular dependance and associated convective heat
transfer
coefficient cause a larger discrepancy then simply specifying it as a
shading
device. I plan to do a little parametric study, but if anyone has dealt
with
this problem, I would be happy to learn of your conclusions.
Peter
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