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Hi Dana,<br>
I've also checked the condenser boiler curve in eQuest.<br>
FIrst of all you have to take into account that the ratio of efficiency
at part load to nominal efficiency is not 1/HIR_curve, but
1/(HIR_curve*PLR).<br>
This will bring the curves closer to what you expect.<br>
Besides, you have to input the return water temperature in ºF (Y-value).<br>
<br>
However, the part load efficiencies that come out from this curve are
well below the ones of condensing boilers used in europe. In fact, as
RWT increases, the curve produces even worst part load efficiencies
than the ones of low temperture boilers.<br>
<br>
<br>
En/na Dana Troy ha escrit:
<blockquote
cite="mid:1253D478FBC8C741B18466AB40B5CCD403931A84@pdxmail1.glumac.com"
type="cite">
<pre wrap="">Has anyone done any verification of the eQUEST 3.63 condensing boiler
curves?
The performance curve specifies the HIR being dependent on the part load
and the return water temperature with a formula as such:
Z = a + bX + cX^2 + dY + eY^2 +fXY
where:
X = PLR
Y = RWT
a = -0.09439243
b = 0.90319633
c = 0.01547839
d = 0.00159793
e = -0.00000645
f = 0.00111453
Since the default curve for a standard boiler seems to be a multiplier
on the EFFICIENCY, which is 1 / HIR, and not the HIR itself, I am
assuming that this curve also modifies the efficiency.
Pulling this formula and coefficient into Excel produces some graphs
that do not resemble at all what a condensing boiler efficiency graph
looks like at all.
For example, the AERCO Benchmark 3.0 looks like the first picture in the
attachment, while the eQUEST default looks like the second picture in
the attachment.
Am I looking at the eQUEST curve wrong in some way? Is it not using the
formula as it says it does in the help file?
Thanks,
Dana
</pre>
<pre wrap="">
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<pre><b><span style="font-size: 12pt; font-family: Arial;" lang="CA"><o:p> </o:p></span></b></pre>
<pre><b><span style="font-size: 12pt; font-family: Arial;"
lang="ES-TRAD">Xavier García Casals</span></b><span
style="font-family: Arial;" lang="ES-TRAD"><o:p></o:p></span></pre>
<pre><span style="font-family: Arial;" lang="ES-TRAD"><o:p> </o:p></span></pre>
<pre><span class="SpellE"><span
style="font-size: 8pt; font-family: Arial;" lang="ES-TRAD">Tel</span></span><span
style="font-size: 8pt; font-family: Arial;" lang="ES-TRAD">: (+34) 91 843 19 85<o:p></o:p></span></pre>
<pre><span style="font-size: 8pt; font-family: Arial;" lang="ES-TRAD">Móvil: 660 22 94 45<o:p></o:p></span></pre>
<pre><span style="font-size: 8pt; font-family: Arial;" lang="ES-TRAD"><a
href="mailto:xgcasals@telefonica.net">xgcasals@telefonica.net</a><o:p></o:p></span></pre>
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