Dear E+ support,
Just need your confirmation if this will work.
To model a window overhang made of spectrally-selective glass
with 0.7 visible transmittance and 0.3 solar transmittance, I use the Shading:Building:Detailed
object to represent this overhang instead of Shading:Overhang. I
specify a Transmittance Schedule of ON (always at 100%).
Then I use ShadingProperty:Reflectance for
this overhang and define Fraction of Shading Surface That Is Glazed to be 1.0 to
specify that this shading surface is all glass. I then define Glazing Construction
Name to be the particular spectrally-selective glass that I meant to
use for this overhang.
Will this work for my purpose of reducing solar heat gain while
attaining sufficient daylighting thru this glass overhang?
Thanks for your support!
Jun
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
On Behalf Of Edilberto Calixihan
Sent: Tuesday, October 05, 2010 4:10 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Re: Glass Overhang Optical Properties
Thanks again for the reply Linda,
We have exterior shading fins, but the
value of solar and visible transmittance are different. Maybe we can have
an E+ object for these fins similar to the transmittance data of glazing for
windows - having different transmittance for solar and visible.
Thanks!
Jun
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
On Behalf Of Linda Lawrie
Sent: Thursday, September 30, 2010 8:29 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Re: Glass Overhang Optical Properties
The overhang and fin features can already have reduced transmittance -- they
work to reduce or increase (from opaque) solar heat gain onto the facade.
They are not interior features (which is what I thought you wanted).
One just uses a transmittance schedule (can be seasonal) for them.
At 01:29 AM 9/30/2010, Edilberto Calixihan wrote:
It is possible then to have an overhang or a shading feature with distinct solar and visible transmittance in future releases of EnergyPlus? Say, place this in the feature request list…. We have had several building projects with tinted glass shading fins and I am very interested to know its effect on reducing solar heat gain and auto-daylighting.
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