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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=blue><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Jeff,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>For most of the baseline models I build, I put the supply and return fan efficiencies in the supply fan only kW/cfm. Since it is a return fan and not a relief fan, any time the supply fan is on, the return fan will be on, so this should work. I could see this approach not being completely accurate in designs with supply and relief fans, where the supply fan could be on, recirculating air with the relief fan off. However, this all exists in the theoretical world of “what could have been” so, I wouldn’t stress too much in bring the baseline design from 95 to 100% accurate.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> <o:p></o:p></span></p><div><p class=MsoNormal><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>Neil Bulger</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:gray'><br></span><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>Project Engineer<o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#99CC00'>________________________________</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#999999'>I N T E G R A L<o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#999999'> </span></b><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'> </span></b><b><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:gray'>GROUP</span></b><span style='font-size:8.0pt;color:gray'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#999999'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>427 13th Street, Oakland CA 94612</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:gray'><br></span><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'>510 663 2070 x 235<br></span><u><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:blue'><a href="mailto:nbulger@integralgroup.com">nbulger@integralgroup.com</a></span></u><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:gray'><br><a href="http://www.integralgroup.com/">www.integralgroup.com</a></span><b><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#99CC00'><br>________________________________</span></b><span style='color:#1F497D'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Jeff Ross-Bain<br><b>Sent:</b> Monday, April 18, 2011 12:47 PM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] ASHRAE G3.1.2.9 Supply Fan Power<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Hi All,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>If an HVAC system comprises both a supply and return fan, and the formula for G3.1.2.9 is used, does the result, P<i>fan</i>, represent ALL of the fan power for that system including supply and return? If so, should the baseline model only depict the supply fan values (CFM, kW/CFM, etc.) and ignore the return? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'>Many thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#006E78'>Jeffrey G Ross-Bain, PE, LEED AP, BEMP</span></b><span style='color:navy'><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#535053'>404-228-2893 office </span></b><span style='color:navy'><o:p></o:p></span></p><p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#535053'>404-408-2577 mobile<br></span></b><b><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#006E78'>www.rbgb.com</span></b><o:p></o:p></p></div></div></body></html>