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<p class=MsoPlainText>Paul<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Ah, yes I see what you mean. We of course did a number
of different studies and so had to of course treat each study differently.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>In terms of the thermal modelling, we looked at the
glazing being essentially a transmissive shading device - the "wall"
we modelled was in front of a curtain wall and so didn't effect the thermal
performance of the building too much, it was an architectural feature wall
largely, but obviously caused a major effect on the shading and also the
airflow which we had to account for as well. Essentially we built an opaque
shading device, applied those properties of a glass brick to that device which
would in essence as you point out would see it as being fully opaque and
therefore light and solar transmission as being nil, but then we applied a
transmissivity profile relating to the small fraction of light/solar gain it
would allow through it. This is relatively easily done in EnergyPlus. The
other way to do it of course would be to make it glazed and apply a shading
coefficient or similar, based on the assumption you can't get the actual
breakdown of the glazing properties.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>The other daylighting simulation required more careful
treatment of the specularity and light transmission values etc and essentially
making it diffusive, a bit like a ceiling light diffuser. I'll see if I can
find copies of the models we built and the figures we used. One was for a
previous employer so I'm not certain I have that model.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Hope that makes more sense<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Paul<o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas'>Dr
Paul Carey</span><span style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas'>BSc
(Hons) PhD FRSA<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas'>Director<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas'>Zero
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<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas'>10A
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Mottram Road<o:p></o:p></span></p>
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0161 3386200</span><span style='font-size:10.5pt;font-family:Consolas'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas'>F:
0161 3031281<o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas'>E:
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<p class=MsoNormal><span style='font-size:8.0pt;font-family:Consolas'>Certificate
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<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Company Registered in England & Wales. Registration
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoPlainText>Paul,<o:p></o:p></p>
<p class=MsoPlainText>You keep saying you modeled it like glass brick but what
does that mean?<o:p></o:p></p>
<p class=MsoPlainText>Did you consider its visible light transmission, its
solar transmission or both to be negligible?<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Paul Riemer<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText> <o:p></o:p></p>
<p class=MsoPlainText>-----Original Message-----<o:p></o:p></p>
<p class=MsoPlainText>From: bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] On Behalf Of Paul Carey<o:p></o:p></p>
<p class=MsoPlainText>Sent: Tuesday, September 14, 2010 6:34 AM<o:p></o:p></p>
<p class=MsoPlainText>To: 'Lars O. Grobe'; bldg-sim@lists.onebuilding.org<o:p></o:p></p>
<p class=MsoPlainText>Subject: Re: [Bldg-sim] Pilkington Profilit translucent
glazing - thermal performance<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Lars,<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>That's exactly why we modelled it as a glass brick. To
be fair it's often used outside of the conventional glazing system to provide
architectural features or in place of an opaque wall to gain areas of
translucency into deep plan areas where they would otherwise suffer from being
miserable dark corners.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Paul<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>-----Original Message-----<o:p></o:p></p>
<p class=MsoPlainText>From: bldg-sim-bounces@lists.onebuilding.org<o:p></o:p></p>
<p class=MsoPlainText>[mailto:bldg-sim-bounces@lists.onebuilding.org] On Behalf
Of Lars O. Grobe<o:p></o:p></p>
<p class=MsoPlainText>Sent: 14 September 2010 11:43<o:p></o:p></p>
<p class=MsoPlainText>To: bldg-sim@lists.onebuilding.org<o:p></o:p></p>
<p class=MsoPlainText>Subject: Re: [Bldg-sim] Pilkington Profilit translucent
glazing - thermal performance<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>On 13.09.2010 21:01, <a
href="mailto:bldg-sim-request@lists.onebuilding.org">bldg-sim-request@lists.onebuilding.org</a>
wrote:<o:p></o:p></p>
<p class=MsoPlainText>> Pilkington Profilit translucent glazing - thermal
performance<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Some points without any warranty ;-)<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>- It is an open system, you cannot evacuate it or fill it
with any special gases<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>- There are several options to improve perfomance like
reducing solar transmission or adding e.g. translucent insulation, coating
inside surfaces,...<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>- For double-glazing, the heat transfer should be about
2.8 W/m2K in a simplified model. However, it may be interesting to have a
closer look at the non-homogenous facade structure.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>- Visible light transmission in the double-glazing setup
could be assumed to be about 75% - however be aware of scattering, this is not
clear glass and thus cannot be treated as such when you look into daylighting.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Cheers, Lars.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>_______________________________________________<o:p></o:p></p>
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