[BLDG-SIM] ASHRAE 90.1 - window SHGC

Robin Mitchell rdmitchell at lbl.gov
Mon Apr 9 15:05:40 PDT 2007


Solarban 70 XL glass layers were added to the IGDB with version 15.0, in
October 2006
 
http://windows.lbl.gov/materials/IGDB/default.htm
 

Robin Mitchell

Windows & Daylighting Group

Lawrence Berkeley National Laboratory

 

 

  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of D. Charlie
Curcija
Sent: Monday, April 09, 2007 12:52 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] ASHRAE 90.1 - window SHGC


Vikram,
 
Perhaps you are using older version of IGDB in WINDOW 5.2.  The PPG's
Solarban 70XL is available in IGDB from ID 5431 to 5434 in thicknesses from
2 to 5 mm.  To update IGDB in WINDOW 5, go to windows.lbl.gov web site,
navigate to WINDOW program pages and see instructions how to update IGDB.
 
Regards,
Charlie

  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Vikram Sami
Sent: Monday, April 09, 2007 2:20 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] ASHRAE 90.1 - window SHGC


Correct me if I'm wrong, but I think your design building can vary from the
90.1 prescriptions (at least for the ECB which is what I am assuming your
using it for - give the design case reference). For example if you use
daylight sensors and you want to use a lighter glass to take advantage of
it, I think you can as long as there's an overall energy savings - am I
correct?
 
Speaking of high performance glass - I am trying to model PPG's Solarban 70,
and it doesn't seem to be available in the window 5.2 database. (Its a new
product with a 0.63 Tviz & 0.27 SHGC - a light to solar gain ratio of 2.33).
Is it possible to manipulate the numbers in Window 5.2? Is the simplified
glazing option acceptable for 90.1 ECB analyses?
 

Vikram Sami, LEED AP 
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 

LORD, AECK & SARGENT ARCHITECTURE
Responsive Design * Technological Expertise * Exceptional Service 
www.lordaecksargent.com 

 

  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of D. Charlie
Curcija
Sent: Monday, April 09, 2007 8:50 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] ASHRAE 90.1 - window SHGC


International Glazing Database (IGDB), which is part of WINDOW 5.2 program
(windows.lbl.gov) contains several hundred individual glass layers whose
solar transmittance is at or below 0.3, which, as a part of glazing system
and whole fenestration product, would produce SHGC of 0.25 or lower, which
meets ASHRAE 90.1 for all climate zones.  The best choice for low SHGC
windows is so called spectrally selective low-e, and there are at least 100
glass products with this type of low-e coating.  The cost of these products
is only marginally higher than the cost of clear glass.
 
I think that you are definitely overlooking something.
 
Having said that, I do want to state that the use of low SHGC products in
heating dominated climates (anything at or above climate zone 5) is wrong
and is the major flaw of both ASHRAE 90.1 and IECC 2006, particularly for
orientations with potentially high solar gain in the winter, such as South
orientation.
 
D. Charlie Curcija
Carli, Inc.
18 Tanglewood Rd.
Amherst, MA 01002
 
Tel: (413) 256-4647
Fax: (413) 256-4823
cell: (413) 575-3487
email:  <blocked::mailto:curcija at fenestration.com> curcija at fenestration.com
web:  <http://www.fenestration.com/> http://www.fenestration.com
 
Support open document format as the best way to assure full compatibility
and interoperability! 
 
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  _____  

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Scott Runyon
Sent: Monday, April 09, 2007 7:52 AM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] ASHRAE 90.1 - window SHGC



When modeling my design case, I find that most windows cannot achieve the
minimum SHGC suggested in ASHRAE 90.1.

 

Why would ASHRAE set unattainable minimum values?      

 

Am I overlooking something in ASHRAE 90.1???

 

Any help would be appreciated.

Thanks,

Scott

 

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