[Trace-users] Appendix G Fan Energy

[Bob Vogt]

Marty,

As you know there are many ways to model fan energy. I normally use the
Apply ECB/PRM rules under the Change Energy Parameters tab for the
baseline building. Trace somehow accounts for the Appendix G
requirements. I do not modify airflows, I let Trace keep track of those.


For the proposed building sometimes I make a fan selection at the
desired static, divide the selected kw by the cfm and static pressure
and input the results in the systems fan tab by inputting the static
pressure and Full Load Energy Rate units of kw/cfm-in wg.

Can your system use a system exhaust in lieu of a return fan?

Hope this helps.

Bob Vogt

-----Original Message-----
From: trace-users-bounces at lists.onebuilding.org
[mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of
trace-users-request at lists.onebuilding.org
Sent: Tuesday, October 27, 2009 3:10 PM
To: trace-users at lists.onebuilding.org
Subject: Trace-users Digest, Vol 15, Issue 1

Send Trace-users mailing list submissions to
	trace-users at lists.onebuilding.org

To subscribe or unsubscribe via the World Wide Web, visit
	
http://lists.onebuilding.org/listinfo.cgi/trace-users-onebuilding.org
or, via email, send a message with subject or body 'help' to
	trace-users-request at lists.onebuilding.org

You can reach the person managing the list at
	trace-users-owner at lists.onebuilding.org

When replying, please edit your Subject line so it is more specific than
"Re: Contents of Trace-users digest..."


Today's Topics:

   1. Appendix G Fan Energy (Snarski, Marty)


----------------------------------------------------------------------

Message: 1
Date: Tue, 27 Oct 2009 13:33:28 -0500
From: "Snarski, Marty" <msnarski at shwgroup.com>
To: <trace-users at lists.onebuilding.org>
Subject: [Trace-users] Appendix G Fan Energy
Message-ID:
	<078AC5207CEDE145A8C7C74FFB3975A05470DE at DALEXC1.shwgroup.com>
Content-Type: text/plain; charset="us-ascii"

Hello, all.

 

I'm running an energy model (for LEED), and am having a particular
problem with the Fan Energy results.  I am using the actual fan
horsepower (for the supply and for the return fans) for the proposed
building, and the Appendix G equation in G3.1.2.9.  The results I'm
getting for the proposed design are considerably higher (about 31%) than
the baseline building.  This leads me to believe that I may be
misinterpreting the equation.  

 

As stated in the 90.1 Users manual, the equation accounts for supply,
return, relief, and exhaust fans.  However, I've been simply inputting
the Supply CFM into the equation.  Given that it accounts for all fans,
should I use the accumulated CFMs for each of those fans (i.e. if I'm
supplying 32,000, and returning 24,000, should I use 56,000 cfm)?

 

While I understand TRACE has the automatic baseline fan sizing
capability, I'm not sure I trust it completely, and would like to know
where the calculation comes from.

 

Thanks for any help you can offer!



NOTICE:
This e-mail transmission is intended only for the use of the individual
or entity named above and may contain information that is confidential,
privileged, and/or exempt from disclosure under applicable law. If you
are not the intended recipient, you are hereby notified that any review,
disclosure, copying, distribution, or other use of any of the
information contained in this transmission is strictly prohibited. If
you have received this transmission in error, please immediately notify
the sender by e-mail at the above address and delete it from your
computer system; you should not copy the message or disclose its
contents to anyone. The content of the message and or attachments may
not reflect the view and opinions of the originating company or any
party it is representing.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/atta
chments/20091027/1e09cfc6/attachment.html>

------------------------------

_______________________________________________
Trace-users mailing list
Trace-users at lists.onebuilding.org
http://lists.onebuilding.org/listinfo.cgi/trace-users-onebuilding.org


End of Trace-users Digest, Vol 15, Issue 1
******************************************