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<DIV dir=ltr align=left><SPAN class=886021918-21122006><FONT face=Arial
color=#0000ff size=2>Mark,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=886021918-21122006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=886021918-21122006><FONT face=Arial
color=#0000ff size=2>The best way to test custom curve fits is to use the boiler
hourly reports and check the efficiency/fuel consumption that is being
calculated against what you are expecting to see.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=886021918-21122006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=886021918-21122006><FONT face=Arial
color=#0000ff size=2>Regards,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=886021918-21122006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=886021918-21122006><FONT face=Arial
color=#0000ff size=2>Peter</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=886021918-21122006><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=886021918-21122006>
<DIV align=left>
<DIV align=left><FONT face=Arial size=2>Peter Alspach, P.E.</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Associate</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Arup</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>403 Columbia St., Suite 220</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Seattle, WA 98104</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>T: 206-493-2226</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>C: 206-<SPAN class=char id=TB><SPAN
class=char id=VS><SPAN>816</SPAN>-</SPAN></SPAN><SPAN class=char
id=VS><SPAN>4902</SPAN></SPAN></FONT></DIV>
<DIV align=left><FONT face=Arial size=2><SPAN class=char><SPAN>F:
206-749-0665</SPAN></SPAN></FONT></DIV>
<DIV align=left><FONT face=Arial size=2>E:
peter.alspach@arup.com</FONT></DIV></DIV></SPAN></DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@GARD.COM
[mailto:BLDG-SIM@GARD.COM] <B>On Behalf Of </B>Mark Nieman<BR><B>Sent:</B>
Thursday, December 21, 2006 9:42 AM<BR><B>To:</B>
BLDG-SIM@GARD.COM<BR><B>Subject:</B> [BLDG-SIM] eQUEST Condensing Boiler
Curve<BR></FONT><BR></DIV>
<DIV></DIV><!-- Converted from text/rtf format -->
<P><FONT face=Courier size=2>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 face=Courier size=2>"Aerco-KC1000-HIR-fEWT&LWT" =
CURVE-FIT </FONT><BR><FONT face=Courier
size=2>
TYPE =
BI-QUADRATIC-T</FONT> <BR><FONT face=Courier size=2>
INPUT-TYPE = DATA</FONT> <BR><FONT
face=Courier size=2> INDEPENDENT-1 = ( 180, 180,
180, 80, 80, 80, 100, 100, 100, 120, 120, </FONT><BR><FONT face=Courier
size=2> 120, 140, 140, 140, 160,
160, 160 )</FONT> <BR><FONT face=Courier size=2>
INDEPENDENT-2 = ( 180, 90, 135, 90, 135, 180, 90, 135, 180,
90, 135, </FONT><BR><FONT face=Courier
size=2> 180, 90, 135, 180, 90,
135, 180 )</FONT> <BR><FONT face=Courier size=2>
DEPENDENT = ( 1, 1.023, 1.019, 1.151,
1.077, 1.065, 1.102, 1.047, </FONT><BR><FONT face=Courier
size=2> 1.038, 1.053, 1.026,
1.017, 1.033, 1.017, 1.012, 1.023, 1.017, </FONT><BR><FONT face=Courier
size=2> 1.007 )</FONT> <BR><FONT
face=Courier size=2> ..</FONT> </P>
<P><FONT face=Courier size=2>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 face=Courier size=2>The link to the data sheet is here:</FONT> <BR><A
href="http://www.aerco.com/cgi-bin/docsserv.cgi?idDocument=344"><U><FONT
face=Arial color=#0000ff
size=2>http://www.aerco.com/cgi-bin/docsserv.cgi?idDocument=344</FONT></U></A>
</P>
<P><FONT face=Arial size=2>Mark Nieman, PE, CEM</FONT> <BR><FONT face=Arial
size=2>Sr. Energy Engineer</FONT> <BR><FONT face=Arial size=2>McKinstry
Essention</FONT> <BR><FONT face=Arial size=1>Direct: (206) 832-8152</FONT>
<BR><FONT face=Arial size=1>Cell: (206) 510-4760</FONT> <BR><FONT face=Arial
size=1>FAX: (206) 832-8552</FONT> <BR><A
href="http://www.mckinstry.com"><U><FONT face=Arial color=#0000ff
size=1>http://www.mckinstry.com</FONT></U></A> <BR><I><FONT face=Arial
size=1>"For The Life Of Your Building"</FONT></I> </P><PRE>
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