<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="COLOR: red"><font color="#000000">Marty,</font></span></div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="FONT-SIZE: 8pt; COLOR: red"><font color="#000000"></font></span> </div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt">I had the same question previously and I would encourage you to check to ECM/PRB sizing option yourself and verify that it is correct if this worries you. All you need to do is apply it for one simulation, open the "equipment energy consumption" report, and do the hand calc with the cfm shown for each fan and compare these values to the kW that Trace has calculated. I think you'll find that they are very close (within 1%). </div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"> </div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt">You say your results are higher and I guess I'm not sure if you are referring to the fan size or to the fan energy consumption. In the particular model that I have in front of me (using the ECM/PRB option) the proposed is also higher. CFM by 16%, kWh by 19%, and kW by 23%. This is not surprising as the proposed case has 70% glass vs. 40% for the baseline so their is more air needed to satisfy the load. The kW/cfm however are nearly the same. I suggest checking items like that to make sure things are proportional because your total % difference doesn't necessarily tell the whole story.</div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"> </div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt">My other thought is that you used the wrong units. In your post you said you used G3.1.2.9 to calculate the horsepower but your result from that equation would be in watts. If you used kW from that equation and entered as hp in your 90.1 model, then you'd have 25% less power than you should leaving your proposed more than 30% ahead. </div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"> </div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt">Hopefully I answered your question somewhere in there.</div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"> </div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt">Regards,</div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="FONT-SIZE: 8pt; COLOR: red"></span> </div>
<div class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="FONT-SIZE: 8pt; COLOR: red">Kevin Caho, LEED</span><sup><span style="FONT-SIZE: 10pt; COLOR: red">®</span></sup><span style="FONT-SIZE: 8pt; COLOR: red"> AP</span><span></span></div>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="FONT-SIZE: 8pt"> </span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="FONT-SIZE: 8pt">SKIDMORE, OWINGS & MERRILL LLP </span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="FONT-SIZE: 8pt; COLOR: gray">224 SOUTH </span><span style="FONT-SIZE: 8pt"><span style="COLOR: gray">MICHIGAN</span><span style="COLOR: gray"></span></span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="FONT-SIZE: 8pt"><span style="COLOR: gray">CHICAGO</span><span style="COLOR: gray">, </span><span style="COLOR: gray">IL</span><span style="COLOR: gray"> </span><span style="COLOR: gray">60604</span><span style="COLOR: gray"> </span></span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="FONT-SIZE: 8pt; COLOR: gray">T: 312.360.4432 F: 312.360.4545 </span></p>
<p class="MsoNormal" style="MARGIN: 0in 0in 0pt; LINE-HEIGHT: 13.5pt"><span style="FONT-SIZE: 8pt; COLOR: gray"><a href="mailto:Kevin.Caho@Som.Com" target="_blank"><span style="COLOR: blue">Kevin.Caho@Som.Com</span></a> </span></p>
<br><br>
<div class="gmail_quote">On Tue, Oct 27, 2009 at 2:10 PM, <span dir="ltr"><<a href="mailto:trace-users-request@lists.onebuilding.org" target="_blank">trace-users-request@lists.onebuilding.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Send Trace-users mailing list submissions to<br> <a href="mailto:trace-users@lists.onebuilding.org" target="_blank">trace-users@lists.onebuilding.org</a><br>
<br>To subscribe or unsubscribe via the World Wide Web, visit<br> <a href="http://lists.onebuilding.org/listinfo.cgi/trace-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/trace-users-onebuilding.org</a><br>
or, via email, send a message with subject or body 'help' to<br> <a href="mailto:trace-users-request@lists.onebuilding.org" target="_blank">trace-users-request@lists.onebuilding.org</a><br><br>You can reach the person managing the list at<br>
<a href="mailto:trace-users-owner@lists.onebuilding.org" target="_blank">trace-users-owner@lists.onebuilding.org</a><br><br>When replying, please edit your Subject line so it is more specific<br>than "Re: Contents of Trace-users digest..."<br>
<br><br>Today's Topics:<br><br> 1. Appendix G Fan Energy (Snarski, Marty)<br><br><br>----------------------------------------------------------------------<br><br>Message: 1<br>Date: Tue, 27 Oct 2009 13:33:28 -0500<br>
From: "Snarski, Marty" <<a href="mailto:msnarski@shwgroup.com" target="_blank">msnarski@shwgroup.com</a>><br>To: <<a href="mailto:trace-users@lists.onebuilding.org" target="_blank">trace-users@lists.onebuilding.org</a>><br>
Subject: [Trace-users] Appendix G Fan Energy<br>Message-ID:<br> <<a href="mailto:078AC5207CEDE145A8C7C74FFB3975A05470DE@DALEXC1.shwgroup.com" target="_blank">078AC5207CEDE145A8C7C74FFB3975A05470DE@DALEXC1.shwgroup.com</a>><br>
Content-Type: text/plain; charset="us-ascii"<br><br>Hello, all.<br><br><br><br>I'm running an energy model (for LEED), and am having a particular<br>problem with the Fan Energy results. I am using the actual fan<br>
horsepower (for the supply and for the return fans) for the proposed<br>building, and the Appendix G equation in G3.1.2.9. The results I'm<br>getting for the proposed design are considerably higher (about 31%) than<br>
the baseline building. This leads me to believe that I may be<br>misinterpreting the equation.<br><br><br><br>As stated in the 90.1 Users manual, the equation accounts for supply,<br>return, relief, and exhaust fans. However, I've been simply inputting<br>
the Supply CFM into the equation. Given that it accounts for all fans,<br>should I use the accumulated CFMs for each of those fans (i.e. if I'm<br>supplying 32,000, and returning 24,000, should I use 56,000 cfm)?<br>
<br><br><br>While I understand TRACE has the automatic baseline fan sizing<br>capability, I'm not sure I trust it completely, and would like to know<br>where the calculation comes from.<br><br><br><br>Thanks for any help you can offer!<br>
<br><br><br>NOTICE:<br>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.<br>
-------------- next part --------------<br>An HTML attachment was scrubbed...<br>URL: <<a href="http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20091027/1e09cfc6/attachment.html" target="_blank">http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20091027/1e09cfc6/attachment.html</a>><br>
<br>------------------------------<br><br>_______________________________________________<br>Trace-users mailing list<br><a href="mailto:Trace-users@lists.onebuilding.org" target="_blank">Trace-users@lists.onebuilding.org</a><br>
<a href="http://lists.onebuilding.org/listinfo.cgi/trace-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/trace-users-onebuilding.org</a><br><br><br>End of Trace-users Digest, Vol 15, Issue 1<br>
******************************************<br></blockquote></div><br><br clear="all"><br>-- <br>Kevin Caho<br>T: 309.716.0084<br><a href="mailto:kevin.caho@gmail.com" target="_blank">kevin.caho@gmail.com</a><br>