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<DIV dir=ltr><FONT face=Arial color=#000000 size=2>Hi Andrew, that is really helpful. I missed that section of the code.</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>Now, a few points that maybe someone could elucidate, maybe even you:</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>1.) Does 50% of the peak design flow rate imply that, if, for example, the min vol setpoint is 30%, then the recirc coming in parallel is 20%?</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>2.) That makes sense, except I am guessing this CFM value is the 50% peak design flow rate? That would only be logical.</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>3.) This min setpoint is for the primary air.</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>4.) The design condition they are referring to is the summer design condition, or the winter design condition or both? I am guessing it is both.</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>That is a great help, thanks for everything so far.</FONT></DIV>
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<DIV dir=ltr><FONT face=Arial size=2>Sincerely,</FONT></DIV>
<DIV dir=ltr><FONT face=Arial size=2>Chien</FONT></DIV>
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<FONT face=Tahoma size=2><B>From:</B> Andrew Craig [mailto:andrew_c@ieice.com]<BR><B>Sent:</B> Thu 21/02/2008 22:12<BR><B>To:</B> Chien Si Harriman; bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> RE: [Bldg-sim] FW:<BR></FONT><BR></DIV>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Chien---</SPAN></FONT></P>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Section G3.1.3.14 of Appendix G hit on requirements for fan powered boxes. They are:</SPAN></FONT></P>
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<P class=MsoNormal style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in"><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><SPAN>1.)<FONT face="Times New Roman" size=1><SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></FONT></SPAN></SPAN></FONT><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">FTUs shall be sized for 50% of the peak design flow rate </SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in"><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><SPAN>2.)<FONT face="Times New Roman" size=1><SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></FONT></SPAN></SPAN></FONT><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">FTUs shall be modeled with 0.35 W/cfm fan power.</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in"><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><SPAN>3.)<FONT face="Times New Roman" size=1><SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></FONT></SPAN></SPAN></FONT><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Minimum volume setpoints for FTUs shall be equal to 30% of the peak design flow rate or the rate required to meet minimum OSA ventilation, whichever is larger.</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 0.5in; TEXT-INDENT: -0.25in"><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><SPAN>4.)<FONT face="Times New Roman" size=1><SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></FONT></SPAN></SPAN></FONT><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The supply air temperature setpoint shall be constant at the design condition.</SPAN></FONT></P>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Hope that helps. Good luck.</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><BR>Regards,</SPAN></FONT></P>
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<P><B><FONT face="Trebuchet MS" color=black size=1><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 'Trebuchet MS'">Andrew Craig, EIT,LEED AP</SPAN></FONT></B><B><FONT face="Trebuchet MS" color=#663300 size=1><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: #663300; FONT-FAMILY: 'Trebuchet MS'">/</SPAN></FONT></B><FONT face="Trebuchet MS" color=black size=1><SPAN style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 'Trebuchet MS'"> Mechanical Designer</SPAN></FONT><FONT face="Trebuchet MS" color=navy size=1><SPAN style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: 'Trebuchet MS'"> <BR></SPAN></FONT><B><FONT face="Trebuchet MS" color=#663300 size=1><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: #663300; FONT-FAMILY: 'Trebuchet MS'">INTERFACE</SPAN></FONT></B><FONT face="Trebuchet MS" color=#663300 size=1><SPAN style="FONT-SIZE: 7.5pt; COLOR: #663300; FONT-FAMILY: 'Trebuchet MS'"> ENGINEERING</SPAN></FONT><FONT face="Trebuchet MS" color=navy size=1><SPAN style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: 'Trebuchet MS'"> <BR></SPAN></FONT><B><FONT face="Trebuchet MS" color=black size=1><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 'Trebuchet MS'">direct</SPAN></FONT></B><FONT face="Trebuchet MS" color=black size=1><SPAN style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 'Trebuchet MS'"> 503.382.2696</SPAN></FONT><FONT face="Trebuchet MS" color=navy size=1><SPAN style="FONT-SIZE: 7.5pt; COLOR: navy; FONT-FAMILY: 'Trebuchet MS'"> </SPAN></FONT></P></DIV>
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<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <B><SPAN style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Chien Si Harriman<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, February 21, 2008 2:07 PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> bldg-sim@lists.onebuilding.org<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Bldg-sim] FW:</SPAN></FONT></P></DIV>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><B><FONT face=Tahoma size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> Chien Si Harriman<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thu 21/02/2008 21:46<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> bldg-sim@lists.onebuilding.org<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> </SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT face=Arial color=black size=2><SPAN style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Hi there-</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I've been tasked with modeling a parallel fan powered box as my baseline system for ASHRAE 90.1 Appendix G, and basically I am wondering if there is anyone who knows of modeling guidelines for that FPB? I have the capability of modeling any sort of conditions I would like, so I can vary the flow rate of the recirc air, the control sequencing of the fan-assist, and even whether that fan is variable volume or constant volume.</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I can't find any guidelines that exist anywhere on this topic in ASHRAE 90.1, and this is the first time I've had to model it (I've never designed an electrically-heated building before). Does anyone know whether:</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">1.) There is a specific ratio for the amount of recirc air to minimum primary air?</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">2.) Whether the amount of recirc air should vary (ie-a variable speed fan)?</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">3.) You can just use a real FPB with data from a company like Carrier, and just call it a day on the simultion effort?</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Any guidance would be really helpful.</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks in advance,</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT face=Arial size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Chien Harriman</SPAN></FONT></P></DIV></DIV></DIV></DIV></BODY></HTML>