[Equest-users] CURVINV Errors

[Pasha Korber-Gonzalez]

Omer- for the baseline model you need to FIRST:   let the model autosize the gpm for the baseline.  SECOND: go to the DOE-2 reports and find the "auto-sized" calculated gpm value for the system loop.  THIRD:  use this gpm value to now calculate the kW/gpm value that you have to use and then you will have your kW value that you are supposed to input into the kW input for the pumps.    You do not need to input the "auto-sized" gpm into the gpm input window.  This input remains blank all the time in the baseline.

This should clear your errors.  When you specify too many input parameters then DOE-2 will start to use those inputs 'against' each other, thus causing the warnings you are seeing.

Pasha Korber-Gonzalez
www.korberenergy.com



On Dec 6, 2011, at 12:12 PM, Ömer Moltay wrote:

> Hi Shaun,
> 
> Thanks for the reply. I know that by autosizing these will go away, but this is regarding the baseline model and I have to enter specified kW/GPM values. Actually these warnings started appearing after I entered these manually.
> 
> We have lots of pumps in our model, so we now have a lot of warnings. I guess that would be a problem for the LEED review.
> 
> Omer.
> 
> 06.12.2011 19:45, Shaun Martin yazmış:
>> Hi Omar,
>> 
>> To my knowledge Hirsch&  co have never properly explained these error
>> messages to this group.  I regularly find the program won't accept the
>> design pump values.
>> 
>> Basically the program doesn't like your combination GPM, head, and kW
>> entries.  Usually, if you let the software autosize the GPM or head (or
>> both), the error messages will disappear.
>> 
>> Shaun
>> 
>> Shaun Martin LEED AP
>> Principal
>> Shaun Martin Consulting
>> 2060 Pine Street, Vancouver BC V6J 4P8
>> 604-789-1095
>> smartin at shaunmartinconsulting.com
>> member CAGBC, ASHRAE
>> 
>> 
>> 
>> -----Original Message-----
>> From: equest-users-bounces at lists.onebuilding.org
>> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
>> omoltay at mimtarch.com
>> Sent: Tuesday, December 06, 2011 6:55 AM
>> To: equest-users at lists.onebuilding.org
>> Subject: [Equest-users] CURVINV Errors
>> 
>> Dear All,
>> 
>> How significant are the following warnings and why are they caused? In our
>> baseline model we suddenly started having probably around 100-200 of these.
>> 
>> CURINV: Result out of limits for CURVE:
>> -0.035642  0.078769  1.353483  0.015932 -0.369414  0.000000  0.000000
>> 0.000000
>> X, Y, and Z:  1.300000  0.000000  1.352446 MMDDHH:   8  26   9
>> CURINV: No real root for CURVE:
>>  1  1.353483  0.015932 -0.369414  0.000000  0.000000  0.000000
>> 
>> These are related to our chilled water pumps.
>> 
>> Thanks for any help,
>> 
>> Omer Moltay
>> Mimta
>> 
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