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<p class=MsoNormal>All,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have been looking at the new condensing boiler curves in
eQUEST 3.63b, and I have a couple questions:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>I produced the plot below for various return water
temperatures using both the data points and the curve fit equation for the “CondBlr-HIR-fPLR&HWR”
curve. The equations did not match the data points as well as I expected,
some of them diverging at PLRs below 20%. The data points match closely
with some data I had from an Aerco boiler, so I suspect the problem is with the
curve fit. Maybe I am calculating wrong or perhaps this is a limitation
of the curve fit? The relationship I used to get the hourly HIR from the
curve “Z” value is:<o:p></o:p></p>
<p class=MsoListParagraph><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:1.0in'>HIR = HIR<sub>full load</sub>
x Z / PLR<o:p></o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p>
<p class=MsoNormal><img width=723 height=365 id="Chart_x0020_5"
src="cid:image001.png@01CA71C8.FF49B960"><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>This curve does not appear to be modified by the rated
HW return temp, input on the 1<sup>st</sup> tab of the boiler screen in the
detailed interface. Is there some other means of accounting
for the rated HWRT in the hourly energy calculation, i.e. an additional modifier
in the above equation?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>If anyone has already come across this or has direct
knowledge of how this is calculated in DOE-2, I would appreciate any insight.
Calculations are attached.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b><i><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Jay
Keazer, EI</span></i></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Energy
Engineer</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>TME,
Inc.</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>2039
N Green Acres Road</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Fayetteville,
AR 72703</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Times New Roman","serif"'>ph
479.521.8634</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Times New Roman","serif"'>fax
479.521.1014<o:p></o:p></span></p>
<p class=MsoNormal><u><span style='font-size:7.5pt;font-family:"Times New Roman","serif";
color:blue'><a href="mailto:email@tmecorp.com"><span style='color:blue'>jkeazer@tmecorp.com</span></a></span></u><u><span
style='color:#1F497D'><o:p></o:p></span></u></p>
<p class=MsoNormal><o:p> </o:p></p>
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