No subject


Thu May 8 09:17:00 PDT 2014


(cold winter) climates, I have seen where a heating dominated building =
=3D
heating dominated climate; has been turned into a cooling dominated
building because of over-design with energy conserving strategies (ie
too high of R-values and use of heat recovery), in addition to ignoring
the type of occupancy and/or the hours of operation of the building.  I
understand that this doesn't help you directly, but I wanted to support
Mitchell's comments about fully knowing your building and it's occupancy
in order to understand why you might be seeing your energy results go in
the opposite direction of what you would initally expect.

Also you might find that using high performance glazing such as the
values you are proposing (might I assume this is a Visionwall or heat
mirror glazing assembly performance) are truly more beneficial in
eliminating the need (and Capital cost) of installing a perimeter
heating system.  The reason being, with this high R-value performance of
the glazing system, you have neutralized the skin losses, and the
situation may actually become more of a thermal comfort issue, rather
than an energy conserving issue.  I had this exact thing happen when
trying to apply and model the Visionwall 4-element (triple-pane
equivalent) glazing system to a University building in Winnepeg,
Manitoba.  The true benefit of the application of the U =3D 0.19
performance value I was modelling was not in the energy savings, but in
the lack of need to install a perimeter heating system, ultimately
saving the project over $90,000 capital cost and resulting in less than
a 1 year payback for the University.  The short payback was associated
more with the offset of capital cost, rather than the energy cost
savings for the high performance glazing.

Hope this gives you more ideas to think about.

cheers,

Pasha Korber
Associate
LEED Accredited Professional

Stantec Consulting
2742 17th Street
San Francisco, CA 94110
Phone: 415-626-6864
Direct:  415-706-9518
Fax:      415-626-1268
pkorber at stantec.com

stantec.com

>>> Mitchell Dec <mdec at glumac.com> 12/15/05 1:27 PM >>>
When using a "high performance glazing" you need to be careful.  Every
building has a different signature (i.e. different shape, size,
occupancy, climate, etc.)  Therefore, one should be careful to say a
"high performance"
glazing is better than a lesser performance glazing.  It is best to
model a wide range of u-values such that you can see which glazing is
optimal for the specific building.  Often, one will see that a
manufacturer says it is "high performance" which it is on its own.  But,
couple that with your wall insulation and the "high performance" wall
configuration requires a different u-value.
=20
You will see a point of diminishing return and in many cases a point at
which the lower window u-value coupled with your wall insulation will in
fact cause one load to go up and the other to go down or vice versa,
depending on your climate.  This is also similar in determining when you
have too much or too little insulation.  What "high performance"
glazings do is allow an opportunity to determine what the most cost
effective path is, decreased window u-value or increased wall
insulation.  Therefore, one is able to have several optimization paths.
=20
I find it convenient to produce a graphical representation (excel is
pretty easy for this) to graph the variable versus the desired output
(energy used or dollars saved, if a LEED project).
=20
I hope this helps.
=20
-Mitch
=20

 <?xml:namespace prefix =3D o ns =3D
"urn:schemas-microsoft-com:office:office"
/>

Mitchell J. Dec
Energy Analyst
503.345.6283 | mdec at glumac.com <mailto:mdec at glumac.com> =20

 <http://www.glumac.com/>=20

  _____ =20

320 SW Washington, Suite 200
Portland, OR 97204-2640
T.  503.227.5280  F. 503.274.7674

Thinking. Inside the building.
http://www.glumac.com/ <http://www.glumac.com/> =20

-----Original Message-----
From: Zoeteman, Mark R. [mailto:mrzoeteman at FTCH.com]
Sent: Thursday, December 15, 2005 12:53 PM
To: bldg-sim at gard.com
Subject: [bldg-sim] High Performance Glazing



I am modeling high performance glazing with U=3D0.14, SC=3D0.35 and
comparing to typical 1" thick insulating low-e glass with U=3D0.33,
SC=3D0.76.  Climate is midwest US and 86% of the glass is facing north.
The north wall is basically all glass and spandrel. Heating is suppied
from district steam supply.

Results show increased steam energy consumption from February through
September with high performance glazing and less for remaining winter
months. HVAC system is VAV with hot water reheat coils.

Overall annual steam energy consumption reduction is very small. I
expected to see significant heating energy savings due to increased
perimeter R-value. Has anyone modeled high performance glazing and seen
similar results?=20


Mark Zoeteman
FTC&H, Inc.=20
(616) 464-3739
mrzoeteman at ftch.com=20




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