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<DIV>Sam,</DIV>
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<DIV>Option 1 is the correct way to model. It is painful for a lab building, yes. Designs are often 50-100% higher in horsepower than what is allowable per Appendix G. It's very important to help the design team understand this and emphasize the importance of finding ways to reduce the fan bhp. </DIV>
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<DIV>Paul</DIV>
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<DIV><FONT size=2>Paul Erickson</FONT></DIV>
<DIV><FONT size=2>Sustainable Team Leader</FONT></DIV>
<DIV><FONT size=2>Affiliated Engineers, Inc</FONT></DIV>
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<DIV><SPAN lang=NL style="FONT-SIZE: 13.5pt; COLOR: green; FONT-FAMILY: Webdings">P</SPAN><FONT face=Verdana color=navy size=2><SPAN lang=NL style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Verdana"> </SPAN></FONT><FONT face=Verdana color=green size=1><SPAN style="FONT-SIZE: 7.5pt; COLOR: green; FONT-FAMILY: Verdana">P</SPAN></FONT><FONT face=Verdana color=green size=1><SPAN lang=NL style="FONT-SIZE: 7.5pt; COLOR: green; FONT-FAMILY: Verdana">lease consider the environment before printing this</SPAN></FONT><FONT face=Verdana color=navy size=2><SPAN lang=NL style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Verdana"> </SPAN></FONT><FONT face=Verdana color=green size=1><SPAN style="FONT-SIZE: 7.5pt; COLOR: green; FONT-FAMILY: Verdana">message.</SPAN></FONT></DIV></DIV></DIV><BR><BR>>>> "Sam Mason" <sam.mason@atelierten.com> 01/22/09 11:10 AM >>><BR>Mike,<BR>Option 1 does seem to be the correct way to model. However, for a few<BR>lab buildings following this method, the fans used almost twice as much<BR>energy in the proposed model as the baseline, so option 2 was used.<BR>Also, if you bunch all of the fan energy into the supply, would it be<BR>possible to model 24/7 constant volume supply or exhaust (fume hoods or<BR>clean rooms) on the same system?<BR><BR>Sam<BR><BR>--<BR>Sam Mason<BR>Atelier Ten<BR>sam.mason@atelierten.com<BR><BR><BR>-----Original Message-----<BR>From: Mike Kaufman [mailto:Mike@ambient-e.com] <BR>Sent: Thursday, January 22, 2009 11:52 AM<BR>To: Sam Mason; Bill Talbert; bldg-sim@lists.onebuilding.org; Kendra<BR>Tupper; Ming Zeng<BR>Subject: RE: [Bldg-sim] System Fan Power in Appendix G<BR><BR>Sam,<BR><BR>Thanks for the response. So, you are suggesting Option 2 is<BR>appropriate. Have you had this method accepted by USGBC? I feel that<BR>Option 1 is more consistent with the intentions of Appendix G, because<BR>every time I use Option 2, I get unreasonably large fan energy savings.<BR>I do agree that the section is written poorly, and the wording can be<BR>interpreted either way, but I wouldn't want to overestimate fan savings<BR>and later have this decision questioned/rejected. Also, I interpret<BR>section G3.1.2.8 to specify the required cfm of the return and exhaust<BR>fans, not the power to each fan.<BR><BR>Thoughts?<BR><BR>Mike<BR><BR><BR><BR>_______________________________________________<BR>Bldg-sim mailing list<BR><A href="http://lists.onebuilding.org/listinfo.cgi/bldg">http://lists.onebuilding.org/listinfo.cgi/bldg</A>-sim-onebuilding.org<BR>To unsubscribe from this mailing list send a blank message to<BR>BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG<BR><BR>________________________________________________________________________<BR>This e-mail has been scanned for all viruses by Star. The service is<BR>powered by MessageLabs. For more information on a proactive anti-virus<BR>service working around the clock, around the globe, visit:<BR><A href="http://www.star.net.uk/">http://www.star.net.uk</A><BR>________________________________________________________________________<BR><BR>______________________________________________________________________<BR>This email has been scanned by the MessageLabs Email Security System.<BR>For more information please visit <A href="http://www.messagelabs.com/email">http://www.messagelabs.com/email</A><BR>______________________________________________________________________<BR>_______________________________________________<BR>Bldg-sim mailing list<BR><A href="http://lists.onebuilding.org/listinfo.cgi/bldg">http://lists.onebuilding.org/listinfo.cgi/bldg</A>-sim-onebuilding.org<BR>To unsubscribe from this mailing list send a blank message to BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG<BR></DIV></BODY></HTML>