[Trace-users] Fan power

AChapin at sriregistrar.com AChapin at sriregistrar.com
Fri Apr 11 07:03:52 PDT 2014

Hi John,

I wasn't able to make any changes to the model to correct the difference 
in fan power. However, I noticed a couple of things.

The Baseline Case "Pretend" doesn't include any pressure drop adjustments 
from Table This will help increase the baseline fan power. 
Note that credit for heat recovery devices may not be taken unless it is 
required in the Baseline Case system (see note under Table G3.1.2.9).
The Proposed Case "Actual" fan power seems high. See attached pdf for a 
range of BHPs for a sample TRANE AHU at 3,000 cfm. They range from 0.88 to 
3.08 depending on the system total static pressure. The system in the 
model has a nominal HP of 10 which is being modeled as 7.46 kW.

Hope that helps,
Alex Chapin

Alex N. Chapin
Sustainability Program Engineer
SRI Green Building Certification, LLC
300 Northpointe Circle ? Suite 304
Seven Fields, PA 16046 ? USA

achapin at SRIRegistrar.com
T: (724) 934-9000 x619
F: (724) 935-6825

Building Sustainability
This message and any included attachments are from SRI Quality System 
Registrar, and are intended only for the addressee. The information 
contained herein may include privileged or confidential information. 
Unauthorized review, forwarding, printing, copying, distributing or using 
such information is strictly prohibited and may be unlawful. If you have 
received this message in error, or have reason to believe that you are not 
authorized to receive it, please promptly delete it and notify the sender 
by e-mail with a copy to mail at sriregistrar.com.  Thank you.

Date: Thu, 10 Apr 2014 18:01:15 +0000
From: "Eurek, John S NWO" <John.S.Eurek at usace.army.mil>
To: "'trace-users at lists.onebuilding.org'"
                 <trace-users at lists.onebuilding.org>
Subject: [Trace-users] Fan power (UNCLASSIFIED)
<E777FD5A41D3B04A83296213737A85D7092442FB at EIS-MB0501WPC.eis.ds.usace.army.mil>
Content-Type: text/plain; charset="us-ascii"

Classification: UNCLASSIFIED
Caveats: NONE


I need a little help.  The fan energy usage of the Actual/Purposed 
building is 4.5X more than the Pretend building.

I've looked and looked and looked for something that is causing such a 
huge difference.

One thing I tried that really confused me was to set the system for the 
pretend building as 'same as Alternate 1' and the pretend building fan 
energy usage went up....  So then I went tab-by-tab and matched 
Alternative 1 to the setting that the Pretend building was using and the 
fan energy for Alternate 1 was still over 2 times the Pretend building.


Classification: UNCLASSIFIED
Caveats: NONE
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20140411/9acd587a/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Sample AHU Fan Performance Data.pdf
Type: application/octet-stream
Size: 47049 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20140411/9acd587a/attachment.obj>

More information about the Trace-users mailing list