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<DIV>At my firm, we proportion the baseline total fan power determined as an aggregated W/CFM based on the hp assigned to the fan motors (supply, return, exhaust) in the design documents. Of course this assumes that your baseline and your proposed design have a one-to-one fan correspondence. </DIV>
<DIV>Ellen</DIV>
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<DIV>Ellen Franconi, Ph.D., LEED AP<BR>Senior Energy Analyst<BR>Architectural Energy Corporation<BR>2540 Frontier Avenue<BR>Boulder, CO 80301<BR>tel. 303-444-4149<BR>fax 303-444-4303<BR>efranconi@archenergy.com<BR><A href="http://www.archenergy.com/">http://www.archenergy.com/</A><BR><BR><BR>>>> "Rosenberg, Michael I" <michael.rosenberg@pnl.gov> 7/1/2009 4:48 PM >>><BR></DIV>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">You have calculated the kW/cfm correctly according to the 2004 version of Appendix G. The allowance actually goes up a little in 2007, for your case. As for the second part of your question, no you do not apply the same kW/cfm to the exhaust fan. The calculated allowed fan power the total allowed power for all fans that are part of the system, including the exhaust fan. The cfm component is based on the supply fan cfm only. Unfortunately, Appendix G gives no direction on how to divide the allowed fan power up among the various fans in the system. <o:p></o:p></SPAN></P>
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<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Mike<o:p></o:p></SPAN></P>
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<P class=MsoNormal style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><B><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 'Verdana','sans-serif'">Michael Rosenberg</SPAN></B><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <BR></SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">Senior Commercial Buildings Energy Analyst</SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <BR></SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Verdana','sans-serif'">ENERGY & ENVIRONMENT DIRECTORATE </SPAN><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P></DIV>
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<P class=MsoNormal><B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Vikram Sami<BR><B>Sent:</B> Wednesday, July 01, 2009 3:03 PM<BR><B>To:</B> Bldg-Sim<BR><B>Subject:</B> [Bldg-sim] Appendix G Fan Power<o:p></o:p></SPAN></P></DIV></DIV>
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<P class=MsoNormal>G3.1.2.9 Gives you a formula for calculating system fan electrical power for supply, return, exhaust and relief. Lets sat I have a zone with a PSZ-HP that has a supply volume of 1500 cfm. Using this formula along with table G3.1.2.9 I get a fan horse power of 1.29 and kW of 1.17. This equates to 0.00078 kW/cfm – which seems really high. <o:p></o:p></P>
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<P class=MsoNormal>The second part to my question is assuming I have 500cfm of exhaust in this zone, do I apply the same kW/cfm to the exhaust fans as well as the return fans? It seems that the lower the fan volume the more inefficient the Appendix G values get from these tables. <o:p></o:p></P>
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<P class=MsoNormal>Any guidance would be much appreciated. <o:p></o:p></P>
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