Frameless Windows

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I'm simulating a retail building for LEED submission and I would like to ask if
it is correct that since these has no frames, assembly U value and SHGC will be
equal to the center of glass u-values. Is this correct?

Many thanks!

Jon

Jon Matthews's picture
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I believe there will still be edge effects to take in to account.

Chris Jones

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I?d be a little skeptical that there wasn?t any edge effect taking place in
the actual building windows, whether due to frame or other method of
connection to the building envelope.

*David S. Eldridge, Jr.**, P**.**E**.**, LEED AP BD+C, BEMP, HBDP*

*From:* bldg-sim-bounces at lists.onebuilding.org [mailto:
bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Jon Matthews
*Sent:* Thursday, September 16, 2010 9:04 AM
*To:* bldg-sim at lists.onebuilding.org
*Subject:* [Bldg-sim] Frameless Windows

I'm simulating a retail building for LEED submission and I would like to ask
if it is correct that since these has no frames, assembly U value and SHGC
will be equal to the center of glass u-values. Is this correct?

Many thanks!

Jon

David S Eldridge's picture
Joined: 2011-09-30
Reputation: 2000

Jon,

It seems you mean the glazing has no mullions. However, it will still have frame at the edges where it connects to the wall- typical in case of storefront windows.

So to answer your question- the assembly and c-o-g values will not be the same. You'll have to model the whole assembly performance values.

If it is an NFRC rated glazing then you should be able to get the data from the manufacturer.

Gaurav Mehta, LEED? AP

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I second Chris Jones's comments.

Whether the glazing is single or double, there will be regular joints in the
glazing which do produce edge affects. Some infrared images I have taken
show some very interesting differences, to the worse, between the basic
physical models and what really happens in a window.

Mark Dewsbury

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