[Equest-users] Window Comparison

[Brett M. West]

Brian,

 

I believe the wrong .inp file was sent the first time. This one should
work. 

 

The 3% change is in the total kWh of the building. There is an
approximately 10% change in the kWh for space cooling only. However, the
heating is all in therms since the system uses hot water reheat provide
by a natural gas boiler throughout. This actually increases with the
improved windows, which makes sense since during the heating periods
there will not be as much solar gain from the windows. But, it increases
enough to the point where it outweighs the gains in cooling to where the
total cost for the year actually goes up by about $1000.00 overall.

 

The building is located in Columbia, SC so I would think the systems
would be in cooling most of the time and I would see a savings over the
course of a year.

 

Brett West

 

RMF Engineering, Inc

Ph: 843.971.9639

bwest at rmf.com 

 

From: Wolfe, Brian [mailto:bwolfe at hksinc.com] 
Sent: Monday, November 08, 2010 5:03 PM
To: Brett M. West; equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Window Comparison

 

I couldn't get it to open to check, but since there's a total of 3%
change, you might check the difference between space cooling and
heating.  The difference might be counteracting each other enough to
reduce the benefits that you thought you'd see.  The location and
internal loads might have some affect as well.

 

BRIAN J. WOLFE, CDT, LEED AP BD+ C

SUSTAINABLE DESIGN COORDINATOR

HKS, INC.

1919 McKINNEY AVENUE

DALLAS, TX 75201

214.969.5599 ext.3669

bwolfe at hksinc.com

www.hksinc.com

If you are sending file(s) always use my Thru DROPBOX
<https://hks.thruinc.net/drop_box.asp?toemail=bwolfe@hksinc.com> 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Brett
M. West
Sent: Monday, November 08, 2010 3:38 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Window Comparison

 

I am doing a model for a two story office building with the windows
making up approximately 30% of the building's exterior. My goal is to
find what type of energy savings the owner can expect by replacing all
the existing single pane windows with double pane, low e windows. When I
change the window type to a double pane low-e window I am seeing savings
that are very small, around 3% of the total building kWh.

 

For reference, the buildings HVAC system consists of two air handlers
(one per floor) ducted to a VAV system with hot water reheat. 

 

Has anyone else tried to do this type of comparison and if so what type
of energy savings did you find? I have attached my model pd2 and inp
files for reference. Thanks in advance for any information.

 

 

Brett West

 

RMF Engineering, Inc

Ph: 843.971.9639

bwest at rmf.com 

 

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