<div><div>Thanks to those who responded, I found a solution to the "Pump Head" and "CURINV" errors listed below. I wanted to post the solution to the list, to add to our knowledge-base.<br><br>Best,<br>
Andy<br><br><br>
<p class="MsoNormal"><b style=""><span style="font-family: Courier;">Error:</span></b></p>
<p class="MsoNormal"><span style="font-family: Courier;"> **WARNING**********************************************************************<br>
Pump:
DHW Loop
Pump
has a user-specified head <br>
of 1. feet, but the loop head
is 6. feet.<br>
CURINV: No real root for CURVE: <br>
1 1.353483 0.015932 -0.369414 0.000000
0.000000 0.000000<br>
CURINV: No real root for CURVE: <br>
1 1.353483 0.015932 -0.369414 0.000000
0.000000 0.000000<br>
CURINV: No real root for CURVE: <br>
1 1.353483 0.015932 -0.369414 0.000000
0.000000 0.000000</span></p>
<p class="MsoNormal"><span style="font-family: Courier;">…repeats for hundreds of
pages</span></p>
<p class="MsoNormal"><span style="font-family: Courier;"> </span></p>
<p class="MsoNormal"><b style=""><span style="font-family: Courier;">Solution:</span></b><span style="font-family: Courier;"></span></p>
<p class="MsoNormal"><span style="font-family: Courier;">Directly editing the INP
file:</span></p>
<p class="MsoNormal"><span style="font-family: Courier;">$
---------------------------------------------------------</span></p>
<p class="MsoNormal"><span style="font-family: Courier;">$<span style=""> </span>Pumps</span></p>
<p class="MsoNormal"><span style="font-family: Courier;">$
---------------------------------------------------------</span></p>
<p class="MsoNormal"><span style="font-family: Courier;"> </span></p>
<p class="MsoNormal"><span style="font-family: Courier;">"DHW </span><span style="font-family: Courier;">Loop</span><span style="font-family: Courier;"> Pump" = PUMP<span style=""> </span></span></p>
<p class="MsoNormal"><span style="font-family: Courier;"><span style=""> </span>HEAD<span style=""> </span>= 7</span></p>
<p class="MsoNormal"><span style="font-family: Courier;"><span style=""> </span>MOTOR-CLASS<span style=""> </span>= HI-EFF</span></p>
<p class="MsoNormal"><span style="font-family: Courier;"><span style=""> </span>..</span></p>
<p class="MsoNormal"><span style="font-family: Courier;"> </span></p>
<p class="MsoNormal"><b style=""><span style="font-family: Courier;">Comments:</span></b></p>
<p class="MsoNormal"><span style="font-family: Courier;">By increasing HEAD from "0.5" to "7", the error disappeared. Impact on simulated energy consumption was
minimal, there was an increase in pump consumption of 0.4 kWh/yr.</span></p>
<br><br> </div><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><blockquote style="margin-right: 0px;"><div dir="ltr" align="left" lang="en-us">
<font face="Tahoma" size="2">-----Original Message-----<br><b>From:</b>
<a href="mailto:BLDG-SIM@gard.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">BLDG-SIM@gard.com</a> [mailto:<a href="mailto:BLDG-SIM@gard.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
BLDG-SIM@gard.com</a>] <b>On Behalf Of </b>Andy
McNamara<br><b>Sent:</b> Tuesday, July 17, 2007 12:18 PM<br><b>To:</b>
<a href="mailto:BLDG-SIM@gard.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">BLDG-SIM@gard.com</a><br><b>Subject:</b> [BLDG-SIM] eQUEST warning messages:
HSUPPLY, DHW Loop Pump, CURINV<br><br></font></div><span class="gmail_quote"></span>I am modeling a building in eQUEST with the following
HVAC system types: PTAC, UVT, MZS, PMZS. The building is situated in New
York City, where code ventilation requirements for the baseline model require
exhaust rates roughly triple ASHRAE 62 guidelines (those requirements will be
changing shortly). It is a 15 story multifamily building comprised of 5
shells due to different floor shapes and zoning patterns. I am having
difficulty understanding three of the warning messages and thought I would see
if other have experienced/solved these problems before. Thanks in
advance! <br><br>1) I am pretty sure this warning message pertains
to the MZS or PMZS because they are the only two air-side systems with HSUPPLY
specified in the INP file.
<br><br>**WARNING**********************************************************************
<br>
User-specified HSUPPLY-CFM is larger
than<br>
available return air. Heating capacity
may<br>
be inadequate.<br>I checked the BEPS report and it shows that
<br>"PERCENT OF HOURS ANY SYSTEM ZONE OUTSIDE OF THROTTLING RANGE =
86.0<br>PERCENT OF HOURS ANY PLANT LOAD NOT
SATISFIED
= 0.0"<br><br>2) I tried increasing the "Pump Head" under
"Domestic Water Heater/Attachments" in the DDI from the default of 1 to
several other values, but the warning message always spits back a number that
is 5 ft greater than whatever I enter under "Pump Head". E.g., I enter
Pump Head = 100, it spits back a loop head of 105 in the warning
message.<br> **WARNING**********************************************************************<br>
Pump: DHW Loop
Pump
has a user-specified head
<br>
of 1. feet, but the loop head
is 6. feet.<br><br>3) Per a
recommendation from Mike Tillou on the BLDG-SIM archive, I tried changing all
curves in the model to "default", but that did not remove the following error
message (which repeats for literally hundreds of pages). <br>CURINV: No real
root for CURVE: <br> 1 1.353483 0.015932 -0.369414
0.000000 0.000000 0.000000<br>CURINV: No real root for CURVE:
<br> 1 1.353483 0.015932 -0.369414 0.000000
0.000000 0.000000<br>CURINV: No real root for CURVE: <br> 1
1.353483 0.015932 -0.369414 0.000000 0.000000
0.000000<br><br clear="all"><br>(Background):<br>Even though I think I've
figured out the source of this warning message, I thought I'd include it in
case it's relevant to understanding the warning messages above. <br><br>This
warning is coming from the exhaust rates being specified higher than outdoor
air intake rates.
<br>**WARNING**********************************************************************<br>
ZONE EL1 ESE Perim Zn ( G.ESE1) in
SYSTEM EL1 Sys1 (PTAC) (G.ESE1)
<br>
has unused EXHAUST-CFM
specified.<br>
This has been converted to outside air.<br><br>Thank you so much!
Looking forward to hearing back from those with thoughts/insights/experiences
on this. <br><br>Best,<br>Andy<br><br></blockquote></div></blockquote></div>