[Bldg-sim] Pilkington Profilit translucent glazing - thermal performance

Paul Carey paul at zed-uk.com
Tue Sep 14 05:14:08 PDT 2010


Paul

 

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.

 

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.

 

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.

 

Hope that makes more sense

 

Paul

 

 

 

 

 


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Paul,

You keep saying you modeled it like glass brick but what does that mean?

Did you consider its visible light transmission, its solar transmission or
both to be negligible?

 

Paul Riemer

 

 

-----Original Message-----

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Paul Carey

Sent: Tuesday, September 14, 2010 6:34 AM

To: 'Lars O. Grobe'; bldg-sim at lists.onebuilding.org

Subject: Re: [Bldg-sim] Pilkington Profilit translucent glazing - thermal
performance

 

Lars,

 

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.

 

Paul

 

 

 

 

 

-----Original Message-----

From: bldg-sim-bounces at lists.onebuilding.org

[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Lars O. Grobe

Sent: 14 September 2010 11:43

To: bldg-sim at lists.onebuilding.org

Subject: Re: [Bldg-sim] Pilkington Profilit translucent glazing - thermal
performance

 

On 13.09.2010 21:01, bldg-sim-request at lists.onebuilding.org wrote:

> Pilkington Profilit translucent glazing - thermal performance

 

Some points without any warranty ;-)

 

- It is an open system, you cannot evacuate it or fill it with any special
gases

 

- There are several options to improve perfomance like reducing solar
transmission or adding e.g. translucent insulation, coating inside
surfaces,...

 

- 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.

 

- 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.

 

Cheers, Lars.

 

 

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