<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1">
<TITLE>Message</TITLE>
<META content="MSHTML 6.00.2800.1400" name=GENERATOR></HEAD>
<BODY>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=669063116-11112005>Thanks, Mike for the guidance. Picking up on what
you've said, I have a notion that curves for my heating system
equipment might be the culprit, since I'm also seeing heating loads
not met in several zones. </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=669063116-11112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=669063116-11112005>..Tom</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=669063116-11112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=669063116-11112005>
<DIV><FONT face=Arial size=2>Thomas J. White, P.E.</FONT></DIV>
<DIV><FONT face=Arial size=2>503.345.6246 |
twhite@glumac.com</FONT></DIV>
<DIV>
<DIV><FONT face=Arial size=2></FONT></DIV><FONT face=Arial size=2><A
href="http://www.glumac.com/"></A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></SPAN></FONT></DIV>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Mike Tillou
[mailto:miket@etcgrp.com]<BR><B>Sent:</B> Friday, November 11, 2005 8:40
AM<BR><B>To:</B> twhite@glumac.com; bldgsim@gard.com<BR><B>Subject:</B> RE:
[bldg-sim] a boatload of CURINV warnings in eQUEST<BR><BR></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=823130016-11112005>I
generally get the CURINV error from bad pump operation/specification. In
this case with so many custom curves it's impossible to know what the
culprit is. The X, Y and Z suggest that the curve causing the problem is
one of the bi-quadratics you have used. Unfortunately resolving the
problem isn't easy. You can do 1 of 2 things; 1- reset all the
custom curves to default curves and see if the problem goes away, if
it does start adding curves in one piece of equipment at at time until the error
re-appears. Then you know which curves are the culprit. 2
- reset curves back to default one piece of equipment at a time untill
the problem goes away. If you reset all the curves and still have a
problem I would look at pumps, chillers, boilers to see if you have
specified any variables that may result in unstable operation.
</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=823130016-11112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=823130016-11112005>Remember that for most pieces of equipment
there are multiple curves that describe operation and unless you
create custom curves for each one of these curves you can
get really bad modeling results.
</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=823130016-11112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=823130016-11112005>Mike</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=823130016-11112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=823130016-11112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=823130016-11112005>Michael Tillou, PE</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=823130016-11112005>etc
Group, Inc</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=823130016-11112005></SPAN></FONT> </DIV>
<P><SPAN lang=en-us><B></B></SPAN></P>
<DIV></DIV>
<DIV><FONT face=Tahoma size=2><FONT face=Arial
color=#0000ff></FONT>-----Original Message-----<BR><B>From:</B>
bldg-sim@gard.com [mailto:bldg-sim@gard.com] <B>On Behalf Of </B>Thomas
White<BR><B>Sent:</B> Thursday, November 10, 2005 6:19 PM<BR><B>To:</B>
bldg-sim@gard.com<BR><B>Subject:</B> [bldg-sim] a boatload of CURINV warnings in
eQUEST<BR><BR></DIV></FONT>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005>Greetings, fellow modelers:</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=263245422-10112005>In
running an old eQUEST model, one that I did not develop so I'm not too
familiar with the strategies used to develop the inputs. I'm getting a
boatload of WARNING messages for curve fits along the following
lines:</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005><FONT face="Courier New" size=1><FONT
size=2></FONT></FONT></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005><FONT face="Courier New" size=1><FONT size=2>CURINV:
Result out of limits for CURVE: </FONT></DIV>
<DIV>
<P><FONT size=2>92.768181********** 0.500614 0.005883 0.000216 -0.019132
0.000224 0.001061</FONT></P>
<P><FONT size=2>X, Y, and Z: 23.077501 24.000000 4.939843 MMDDHH: 1 4
1</FONT></P></FONT></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=263245422-10112005>Can
you guys advise me about what these messages mean and how to interpret them:
what is the curve number (92.76181), what are the next six values on the first
line, and what is that X, Y, Z all about in the last line? [I'm betting
that last set, MMDDHH: 1 4 1, is the date/time: January 4, at 1 AM in the
morning.]</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=263245422-10112005>My
model has quite a few curve fit assignments under the PERFORMANCE CURVE folder
of the Water-Side HVAC frame (33 to be exact). Also, these curves run the
gamut of linear, quadratic, bi-quadratic, and cubic. </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=263245422-10112005>For
all but two of the curves the MINIMUM OUTPUT and MAXIMUM OUTPUT values
are -1,000,000 and 1,000,000 respectively. There are two exceptions: the range
for the Variable Speed Drive is 0.10 to 1.00, the range for the
HW-Coil-Cap-fdT curve is 0.01 to 1,000,000.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005></SPAN></FONT><FONT face=Arial color=#0000ff
size=2><SPAN class=263245422-10112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005>Help?!</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005>...Tom</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=263245422-10112005></SPAN></FONT> </DIV>
<DIV>
<DIV><FONT face=Arial size=2>Thomas J. White, P.E.</FONT></DIV>
<DIV><FONT face=Arial size=2>Lead Engineer, Energy Services</FONT></DIV>
<DIV><FONT face=Arial size=2>503.345.6246 |
twhite@glumac.com</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>320 SW Washington, Suite 200</FONT></DIV>
<DIV><FONT face=Arial size=2>Portland, OR 97204-2640</FONT></DIV>
<DIV><FONT face=Arial size=2>T. 503.227.5280
F. 503.274.7674 </FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.glumac.com/">http://www.glumac.com</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV><FONT face=Arial color=#0000ff
size=2></FONT></DIV><PRE>======================================================
You received this e-mail because you are subscribed
to the BLDG-SIM@GARD.COM mailing list. To unsubscribe
from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@GARD.COM
</PRE></BLOCKQUOTE><PRE>
======================================================
You received this e-mail because you are subscribed
to the BLDG-SIM@GARD.COM mailing list. To unsubscribe
from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@GARD.COM
</PRE></BODY></HTML>