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<P><FONT SIZE=2 FACE="Courier">Using eQUEST v.3.6, I've taken a stab at creating a performance curve for an Aerco KC1000 condensing boiler. I've defined BOILER:HIR-FT = "Aerco-KC1000-HIR-fEWT&LWT" as shown below. This boiler is being used for a water source heat pump condenser water loop with a CT/HX & two condensing boilers, piped in a primary loop configuration.</FONT></P>
<P><FONT SIZE=2 FACE="Courier">"Aerco-KC1000-HIR-fEWT&LWT" = CURVE-FIT </FONT>
<BR><FONT SIZE=2 FACE="Courier"> TYPE = BI-QUADRATIC-T</FONT>
<BR><FONT SIZE=2 FACE="Courier"> INPUT-TYPE = DATA</FONT>
<BR><FONT SIZE=2 FACE="Courier"> INDEPENDENT-1 = ( 180, 180, 180, 80, 80, 80, 100, 100, 100, 120, 120, </FONT>
<BR><FONT SIZE=2 FACE="Courier"> 120, 140, 140, 140, 160, 160, 160 )</FONT>
<BR><FONT SIZE=2 FACE="Courier"> INDEPENDENT-2 = ( 180, 90, 135, 90, 135, 180, 90, 135, 180, 90, 135, </FONT>
<BR><FONT SIZE=2 FACE="Courier"> 180, 90, 135, 180, 90, 135, 180 )</FONT>
<BR><FONT SIZE=2 FACE="Courier"> DEPENDENT = ( 1, 1.023, 1.019, 1.151, 1.077, 1.065, 1.102, 1.047, </FONT>
<BR><FONT SIZE=2 FACE="Courier"> 1.038, 1.053, 1.026, 1.017, 1.033, 1.017, 1.012, 1.023, 1.017, </FONT>
<BR><FONT SIZE=2 FACE="Courier"> 1.007 )</FONT>
<BR><FONT SIZE=2 FACE="Courier"> ..</FONT>
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<P><FONT SIZE=2 FACE="Courier">Question: Is this a proper curve for this equipment? Any comments and critiques would be much appreciated. Part of my difficulty is that HIR-FT is a Bi-Quadratic-T or Bi-Linear-T curve that needs two temperatures (EWT & LWT) to define the HIR ratio modifier. When looking at the curves, it's stated as thermal efficiency vs. EWT (return water temperature) on several different curves based on fire rate of the boiler. Basically, I assumed a LWT based on firing rate (90F=25%, 135F=75% & 180F=100%). I'm not sure if this is reasonable or not. Per the manual, the DEPENDENT variable is the ratio of the actual efficiency (based on the curves) / rated efficiency (at full fire, full load). INDEPENDENT-1 = EWT, INDEPENDENT-2 = LWT.</FONT></P>
<P><FONT SIZE=2 FACE="Courier">The link to the data sheet is here:</FONT>
<BR><A HREF="http://www.aerco.com/cgi-bin/docsserv.cgi?idDocument=344"><U><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">http://www.aerco.com/cgi-bin/docsserv.cgi?idDocument=344</FONT></U></A>
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<P><FONT SIZE=2 FACE="Arial">Mark Nieman, PE, CEM</FONT>
<BR><FONT SIZE=2 FACE="Arial">Sr. Energy Engineer</FONT>
<BR><FONT SIZE=2 FACE="Arial">McKinstry Essention</FONT>
<BR><FONT SIZE=1 FACE="Arial">Direct: (206) 832-8152</FONT>
<BR><FONT SIZE=1 FACE="Arial">Cell: (206) 510-4760</FONT>
<BR><FONT SIZE=1 FACE="Arial">FAX: (206) 832-8552</FONT>
<BR><A HREF="http://www.mckinstry.com"><U><FONT COLOR="#0000FF" SIZE=1 FACE="Arial">http://www.mckinstry.com</FONT></U></A>
<BR><I><FONT SIZE=1 FACE="Arial">"For The Life Of Your Building"</FONT></I>
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