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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Robert,<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'>The fan mechanical efficiency implied in 90.1 may also be deduced from the formula given for A in the footnote to Table 6.5.3.1.1A: </span><i><span style='font-size:11.0pt;color:windowtext'>A </span></i><span style='font-size:11.0pt;color:windowtext'>= sum of (<i>PD </i>¡Á <i>CFMD</i>/4131). ¡®</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>A¡¯ is expressed in units of BHP, so by comparing this equation to the theoretical equation </span>Fan BHP = (cfm x static press "w.c.) / (6356 x fan efficiency) <span style='font-size:11.0pt;color:#17375E;mso-style-textfill-fill-color:#17375E;mso-style-textfill-fill-alpha:100.0%'><span style='color:windowtext'>we get mechanical efficiency of 4131/6356~65%<o:p></o:p></span></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#17375E;mso-style-textfill-fill-color:#17375E;mso-style-textfill-fill-alpha:100.0%'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;color:#17375E;mso-style-textfill-fill-color:#17375E;mso-style-textfill-fill-alpha:100.0%'><span style='color:windowtext'>Maria</span></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#17375E;mso-style-textfill-fill-color:#17375E;mso-style-textfill-fill-alpha:100.0%'><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><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";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Bishop, Bill<br><b>Sent:</b> Monday, March 25, 2013 12:40 PM<br><b>To:</b> RobertWichert<br><b>Cc:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] Baseline Fan power calculation<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Robert,<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'>I apologize for confusing motor efficiency with fan mechanical efficiency. Since section 6.5.3.1 describes the maximum allowable fan power, we can expect it to use conservative allowances for mechanical efficiency and static pressure. Using the allowance for bhp (bhp ¡Ü CFM<sub>S</sub>*0.00094 + A) and neglecting the pressure drop adjustments (A), we can determine static pressures (SP) for a range of mechanical efficiencies by setting 0.00094 = SP/(6356xefficiency). Using a range of mechanical efficiencies from 0.4 to 0.6 (ASHRAE Pocket Guide, 7<sup>th</sup> ed. p. 246), we get a range of static pressures from 2.4¡± to 3.6¡± w.g. That¡¯s higher than your 0.5¡±, but seems reasonable to me for determining max allowable fan power.<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'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Bill<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:10.0pt;font-family:"Franklin Gothic Medium","sans-serif"'>William Bishop, PE, BEMP, LEED AP </span></b><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:#006600'>|</span></b><b><span style='font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif"'> Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Senior Energy Engineer<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:5.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>134 South Fitzhugh Street</span><span style='font-size:9.0pt;color:#1F497D'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Rochester, NY 14608<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>T: (585) 325-6004 </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Ext. 114</span><span style='color:#1F497D'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>F: (585) 325-6005</span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="mailto:wbishop@pathfinder-ea.com"><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>wbishop@pathfinder-ea.com</span></a></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.pathfinder-ea.com/"><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>www.pathfinder-ea.com</span></a></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:Webdings;color:green'>P</span><span style='font-size:14.0pt;color:green'> </span><span style='font-size:7.5pt;color:green'>Sustainability ¨C the forest AND the trees.</span><span style='font-size:18.0pt;font-family:Webdings;color:green'> </span><span style='font-size:14.0pt;font-family:Webdings;color:green'>P</span><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:green'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";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";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> RobertWichert [<a href="mailto:robert@wichert.org">mailto:robert@wichert.org</a>] <br><b>Sent:</b> Monday, March 25, 2013 12:17 PM<br><b>To:</b> Bishop, Bill<br><b>Cc:</b> Nick Caton; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Baseline Fan power calculation<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'>Thanks Bill,<br><br>I verified that the references you gave lead to the result of the calculation in the spreadsheet, but if the theoretical calculation below has any validity at all, the assumed fan efficiency in 90.1 is about 8%. I used a fan static pressure rise of .5 in. H2O. <br><br>So, this fan efficiency seems a little low to me.<br><br>You said "Fan efficiency is from ASHRAE 90.1, Table 10.8 as described in G3.1.2.9." but Table 10.8 is Fan Motor efficiency, which is about 85%. I have no problem with that, but to use the theoretical fan power equation I need the Fan efficiency. Do you have any idea what fan efficiency is assumed in 90.1?<br><br>I also notice that the fan power calculation in 90.1 does not include a pressure rise component, which I find odd. Is the pressure rise across the fan assumed somewhere? From the checks described above, it appears to be about .5 in. H2O. Does this seem reasonable?<br><br><br><br>Your thoughts?<br><br><br><br><o:p></o:p></p><pre>Robert Wichert P.Eng. LEED AP BD&C<o:p></o:p></pre><pre>+1 916 966 9060<o:p></o:p></pre><pre>FAX +1 916 966 9068<o:p></o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>===============================================<o:p></o:p></pre><p class=MsoNormal>On 3/25/2013 8:01 AM, Bishop, Bill wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Robert,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I¡¯m sure Nick is typing furiously as I write this, but I¡¯ll probably finish before him.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Taking a quick look at the spreadsheet that Nick attached to his email, it calculates baseline fan power using the method described in Appendix G and 6.5.3.1.1. Fan efficiency is included in the P<sub>fan</sub> calculation per G3.1.2.9.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Fan efficiency is from ASHRAE 90.1, Table 10.8 as described in G3.1.2.9.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Bill</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><div><p class=MsoNormal><b><span style='font-size:10.0pt'>William Bishop, PE, BEMP, LEED AP | Pathfinder Engineers & Architects LLP</span></b><o:p></o:p></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Senior Energy Engineer</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:5.0pt;font-family:"Arial","sans-serif"'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>134 South Fitzhugh Street</span><span style='font-size:9.0pt;color:#1F497D'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Rochester, NY 14608</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>T: (585) 325-6004 </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Ext. 114</span><span style='color:#1F497D'> </span><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D'>F: (585) 325-6005</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="mailto:wbishop@pathfinder-ea.com"><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>wbishop@pathfinder-ea.com</span></a></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.pathfinder-ea.com/"><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>www.pathfinder-ea.com</span></a></span><o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;font-family:Webdings;color:green'>P</span><span style='font-size:14.0pt;color:green'> </span><span style='font-size:7.5pt;color:green'>Sustainability ¨C the forest AND the trees.</span><span style='font-size:18.0pt;font-family:Webdings;color:green'> </span><span style='font-size:14.0pt;font-family:Webdings;color:green'>P</span><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:green'> </span><o:p></o:p></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></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";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>RobertWichert<br><b>Sent:</b> Monday, March 25, 2013 10:52 AM<br><b>To:</b> Nick Caton; <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Baseline Fan power calculation</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'>I believe I have written about this in the past, but since this seems to be on-topic, I'll bring it up again.<br><br>The theoretical fan power equation, Fan BHP = (cfm x static press "w.c.) / (6356 x fan efficiency) can be used to calculate the theoretical fan BHP, but you need the fan efficiency. This seems to be NOT the way the BHP is being calculated by the spreadsheet that was attached previously.<br><br>Is there a reason for that?<br><br>Was there an assumed fan efficiency used in the spreadsheet, and was it based on anything particular, or just a conservative assumption?<br><br><br>Thanks!<br><br><br><br><br><o:p></o:p></p><pre>Robert Wichert P.Eng. LEED AP BD&C<o:p></o:p></pre><pre>+1 916 966 9060<o:p></o:p></pre><pre>FAX +1 916 966 9068<o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre><pre>===============================================<o:p></o:p></pre><p class=MsoNormal>On 3/25/2013 7:34 AM, Nick Caton wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Vamshi,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I advise carefully reviewing the footnotes under Table 6.5.3.1.1A, which include procedure for determining baseline fan power adjustments.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>P<sub>fan</sub> represents the sum power of all fans in a given baseline system (with exception to baseline systems #6/#8, fan powered VAV boxes).</span><o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Again, there is not a separate supply/return power calculation (see answer #1). You can however account for adjustments present in separate airstreams from the proposed design. </span><o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Probably not. Review the difference between CFM<sub>S</sub> and CFM<sub>D</sub> carefully at the cited Table. A CFM quantity representing the airflow each element encounters (CFM<sub>D</sub>) should be applied against each pressure drop adjustment, not an ¡®aggregate¡¯ of supply+return. </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You may also find the attached resource published by 7group helpful to cement your procedural understanding of how to arrive at the sum total for ¡°A.¡± </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards,</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>~Nick</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img border=0 width=119 height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CE2960.5D1E5030" alt="cid:489575314@22072009-0ABB"></span><o:p></o:p></p><p class=MsoNormal><b><span style='font-size:11.0pt'> </span></b><o:p></o:p></p><p class=MsoNormal><b>NICK CATON, P.E.</b><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900'>SENIOR ENGINEER</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>Smith & Boucher Engineers</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>25501 west valley parkway, suite 200</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>olathe, ks 66061</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>direct 913.344.0036</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E'>fax 913.345.0617</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue'> </span></u><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><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"'> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>vamshi ranga<br><b>Sent:</b> Monday, March 25, 2013 8:17 AM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Baseline Fan power calculation</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Hi All,<o:p></o:p></p><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>I have a doubt regarding calculating fan power as per ASHRAE 90.1-2007.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>My proposed system has, supply return and exhaust fans separately with kW and cfm mentioned for each fan.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>So, for calculating baseline fan power, <o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>1. should I calculate it separately for each fan type? <o:p></o:p></p></div><div><p class=MsoNormal>2. can I take pressure drop adjustment both in supply and return fan power calculation?<o:p></o:p></p></div><div><p class=MsoNormal>3. should I sum all the cfms of supply, return and exhaust and than apply pressure drop adjustments to aggregated cfm.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Kindly help me out in solving the doubt. If you have any example fan power calculations, or web links those could guide me regarding this, plz do share them.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Thanks in advance.<o:p></o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><p class=MsoNormal>Regards,<o:p></o:p></p></div><div><p class=MsoNormal>Vamshi.<o:p></o:p></p></div><p class=MsoNormal style='margin-bottom:12.0pt'><br><br><br><o:p></o:p></p><pre>_______________________________________________<o:p></o:p></pre><pre>Equest-users mailing list<o:p></o:p></pre><pre><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><o:p></o:p></pre><pre>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></pre></blockquote><p class=MsoNormal> <o:p></o:p></p></blockquote><p class=MsoNormal><o:p> </o:p></p><div class=MsoNormal align=center style='text-align:center'><span style='color:windowtext'><hr size=1 width="100%" noshade style='color:#A0A0A0' align=center></span></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='color:windowtext'>No virus found in this message.<br>Checked by AVG - <a href="http://www.avg.com">www.avg.com</a><br>Version: 2012.0.2240 / Virus Database: 2641/5703 - Release Date: 03/25/13<o:p></o:p></span></p></div></body></html>