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As Praveen pointed out --<br>
<br>
setting a = 1 means the compressor will draw full power regardless
of the part load.<br>
<br>
setting b = 1 and a = 0 means the the compressor COP will be the
full load value for all part load conditions. (slope = 1)<br>
<br>
On 7/8/2011 9:52 AM, Nick Caton wrote:
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<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Sambhav and Praveen:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Recently I see both of you were asking about
“flat”
curves or curves that would always return the same value
(1.0) to be multiplied
against the modified input (EIR).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Trying to do this in the raw data method might be
possible, but
it might not be either… the math involved in those
regressions is
something I can only briefly comprehend in short bursts =).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">What I can offer is – this sounds pretty simple
if you
define the coefficients directly instead! <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">For example:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: black;">Bi-Quadratic:
Z = a + bX + cX<sup>2</sup> + dY + eY<sup>2</sup>
+ fXY<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">If you want the value returned to always equal
1.0, just choose
coefficients that make the variables X and Y not matter! <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">[b = c = d= e = f = 0], and set [a =1].<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">Does that help?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);">~Nick<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
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style="font-size: 11pt; font-family: "Stylus
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<p class="MsoNormal"><b><span style="font-size: 11pt;
font-family: "Stylus BT","sans-serif";
color: rgb(45, 77, 94);"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family: "Stylus
BT","sans-serif"; color: rgb(45, 77, 94);">NICK
CATON, P.E.</span></b><b><span style="font-family:
"Stylus BT","sans-serif"; color:
rgb(45, 77, 94);"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size: 7.5pt; font-family:
"Calibri","sans-serif"; color: rgb(204,
153, 0);">SENIOR ENGINEER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 7.5pt; font-family:
"Calibri","sans-serif"; color: rgb(204,
153, 0);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Calibri","sans-serif"; color: rgb(45,
77, 94);">Smith & Boucher Engineers</span><span
style="font-size: 7.5pt; color: rgb(204, 153, 0);"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Calibri","sans-serif"; color: rgb(45,
77, 94);">25501 west valley parkway, suite 200<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Calibri","sans-serif"; color: rgb(45,
77, 94);">olathe, ks 66061<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Calibri","sans-serif"; color: rgb(45,
77, 94);">direct 913.344.0036<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family:
"Calibri","sans-serif"; color: rgb(45,
77, 94);">fax 913.345.0617<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><a moz-do-not-send="true"
href="www.smithboucher.com"
title="blocked::www.smithboucher.com"><span
style="font-size: 10pt; color: blue;">www.smithboucher.com</span></a></span><u><span
style="font-size: 10pt; font-family:
"Calibri","sans-serif"; color: blue;">
+<o:p></o:p></span></u></p>
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<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">-----Original Message-----<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] On Behalf
Of sambhav tiwari<br>
Sent: Thursday, July 07, 2011 11:43 PM<br>
To: <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
Subject: [Equest-users] Curve fitting<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Hi All,<o:p></o:p></p>
<p class="MsoPlainText">
Each time i create a new curve by putting same values of<o:p></o:p></p>
<p class="MsoPlainText">raw data i am getting different values
of coefficients
a,d,c,d for<o:p></o:p></p>
<p class="MsoPlainText">cubic equation(a+bx+cx2+dx3) the
solution (a,b,c,d)
should be same<o:p></o:p></p>
<p class="MsoPlainText">only if raw data values are same in each
curve then why<o:p></o:p></p>
<p class="MsoPlainText">coefficient(a,b,c,d) values are
changing?<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Thanks<o:p></o:p></p>
<p class="MsoPlainText">Sambhav<o:p></o:p></p>
<p class="MsoPlainText">_______________________________________________<o:p></o:p></p>
<p class="MsoPlainText">Equest-users mailing list<o:p></o:p></p>
<p class="MsoPlainText"><a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><o:p></o:p></p>
<p class="MsoPlainText">To unsubscribe from this mailing list
send a blank
message to <a class="moz-txt-link-abbreviated" href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family:
"Calibri","sans-serif"; color: rgb(31,
73, 125);"><o:p> </o:p></span></p>
<div style="border-right: medium none; border-width: 1pt medium
medium; border-style: solid none none; border-color: rgb(181,
196, 223) -moz-use-text-color -moz-use-text-color; padding:
3pt 0in 0in;">
<p class="MsoNormal"><b><span style="font-size: 10pt;
font-family: "Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family:
"Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <b>On
Behalf Of </b>Praveen
Jain<br>
<b>Sent:</b> Monday, July 04, 2011 11:41 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Flat part load curve for
Chiller<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear All<br>
<br>
For our district cooling project, we require flat part load
curve for the air
cooled screw chiller.<br>
<br>
I played with curve coefficient in two ways <br>
<br>
(1) A=1, B=0, C=0<br>
With this, Ratio of cooling energy from SS-D and BEPU, is not
giving entered
COP.<br>
<br>
(2) A=0, B=1 , C=0<br>
<br>
With this, Ratio of cooling energy from SS-D and BEPU, is
giving approx entered
COP.<br clear="all">
<br>
<br>
What is exact way to create flat part load curve in eQuest.<br>
-- <br>
With Thanks and Regards,<br>
Praveen K. Jain<br>
Roorkee<o:p></o:p></p>
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