[Equest-users] Window Comparison

[Paul Diglio]

Brett:

I took a quick look at your baseline model.  Your EUI (KBTU/FT2/Year in the BEPS 
report is very high at 202.9.  If you go to Project & Site you can enter the QC 
Reporting Climate Zone for CBECS Comparison.  I chose the under 2000 CCD and 
fewer than 4000 HDD.  I do not know if this is correct.

After you run the simulation go to Tools then Quality Control Reporting.  The 
end of the report states your model's EUI as compared to the CBECS.  Your model 
consumes about double the energy use.  Your unmet hours are a little high.

I would try setting the throttling range from 3 to 6 degrees and change the 
thermostats from 2 Position to Proportional in the Zone Parameters Basic 
Specifications.  Also try entering a Control Zone for each air handling unit in 
the Airside Basics tab.

Paul Diglio







________________________________
From: Brett M. West <bwest at rmf.com>
To: "Wolfe, Brian" <bwolfe at hksinc.com>; equest-users at lists.onebuilding.org
Sent: Mon, November 8, 2010 5:20:25 PM
Subject: Re: [Equest-users] Window Comparison

 
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
 
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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