[Equest-users] Simple question...hopefully

[Gary.Schrader at buildings.schneider-electric.com]

One final warning, however...
 
It may be dangerous to conclude that the windows make a difference with
the increase in energy usage in the winter time. Most buildings have
interior shades that people use when the sun is shining in their window.
I can't ever remember a time when I changed eQuest's default interior
shading, and in previous modeling, I always assumed that there was no
interior shading. (For the purposes of doing loads this made sense as it
would get me the worst-case load on the zone in question)
 
If people are drawing their shades, then the heating effect by sunlight
would be reduced. This is the case for either the "better" glazing or
the "standard" glazing. So while your model will still show greater
energy usage due to the fact that sunlight is reduced, it probably isn't
going to be to the degree that it indicates, unless you did account for
interior shading in your model.
 
Good luck,
Gary

________________________________________________________________________
_______________________________________________



Gary Schrader | Schneider Electric | Buildings Business | Energy
Solutions | Engineer I
Phone: +1 | Mobile: +1 913 217 8068 | Fax: +1 913 469 0206
Email: gary.schrader at buildings.schneider-electric.com | Site:
www.schneider-electric.com/buildings | Address: 16011 College Boulevard,
Suite 212, Lenexa, KS 66219, USA

*** Please consider the environment before printing this email.

 

________________________________

From: David Delasantos [mailto:DavidD at mbharch.com] 
Sent: Monday, November 16, 2009 11:51 AM
To: Gary Schrader
Subject: RE: [Equest-users] Simple question...hopefully


Higher gas usage.  Electric is virtually unchanged.  I was designing to
mitigate heat gain in the summer and had not considered the effect it
would have in the winter.  Now that I think of it, the building is in
San Francisco so I assume the summer heat loads must be negligible since
the building has no A/C.  Thank you for your prompt response.

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Gary.Schrader at buildings.schneider-electric.com
Sent: Monday, November 16, 2009 9:18 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Simple question...hopefully


Are you talking higher gas usage, higher electrical, or both?
 
I could see using higher gas in the winter if the glazing has a higher
absorptivity and thus doesn't allow as much sunlight in the structure in
the winter, thus requiring a larger amount of gas to heat.
 
I can't think of a reason why the electricity would increase off the top
of my head. If your energy increase involves electricity, I would be
scratching my head. That is, of course, unless you are dealing with an
all-electric building.
 
My two cents,
Gary

________________________________________________________________________
_______________________________________________



Gary Schrader | Schneider Electric | Buildings Business | Energy
Solutions | Engineer I
Phone: +1 | Mobile: +1 913 217 8068 | Fax: +1 913 469 0206
Email: gary.schrader at buildings.schneider-electric.com | Site:
www.schneider-electric.com/buildings | Address: 16011 College Boulevard,
Suite 212, Lenexa, KS 66219, USA

*** Please consider the environment before printing this email.

 

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of David
Delasantos
Sent: Monday, November 16, 2009 11:02 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Simple question...hopefully



I ran a very quick and dirty EEM to compare the effects of using a
different glass type when compared to the baseline model, which was
created in the SD Wizard.  Contrary to my expectations, the higher
performance glass resulted in higher annual energy usage!  The glazing
is the only component I changed in the model.  If anyone can speak to
this result, I would appreciate it.

Thank you...DD 


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