[BLDG-SIM] ASHRAE 90.1 - window SHGC

[Xia Fang]

Hi, 
 
For a new building addition 5000sqft tied into existing 30,000sqft
building, when the HVAC system is tied into the existing chiller and
boiler plant, does it mean I will need to model the whole building new
and existing? From interpretations of ASHRAE 90.1-2004 appendix G, table
G3.1, "on alterations and additions", it sort of listed the new building
will need to be completely excluded from existing HVAC in order to be
modeled separately. 
 
And how will the LEED credit be accounted for EA credit 1?
 
 

Xia Fang, PE, LEED AP

EMC Engineers, Inc.
www.emcengineers.com <http://www.emcengineers.com/> 
Making buildings work.  Better.
(303) 974-1232
(303) 974-1239 (fax)

 


________________________________

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of D.
Charlie Curcija
Sent: Monday, April 09, 2007 1:52 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: curcija at fenestration.com
<blocked::mailto: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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