[Equest-users] eQuest Warning

[B. Fountain]

Yep -- by sizing the loop on primary (which I suggest) you are setting the
loop size equal to the boiler (or chiller) sizing (the primary equipment
sizing).  Under secondary sizing the loop is sized as the sum of all the
heating coils on the loop.  For a VAV system, the reheat coils would be
full capacity at full airflow -- much larger than would really be needed
by the building.

So I recommend sizing your loops on primary, setting your primary
equipment sizes a little larger than the  SS-D report values and then
verifying on your PS-D report that you are not getting overloaded hours.



> Thanks B. Fountain,
>
> I could not find the curves in detailed mode. I revised some gpm's in
> the wizard and the warnings disappeared.
>
> Can you explain the difference in Primary Capacity and Secondary
> Capacity on the Warnings Page. I am getting warnings like " Chilled
> Water Loop cooling capacity is smaller than the secondary demand.
> Primary= 7200000, Secondary= 9182919"
>
> Bob
>
> -----Original Message-----
> From: B. Fountain [mailto:bfountain at greensim.com]
> Sent: Friday, June 04, 2010 11:41 AM
> To: Bob Vogt
> Cc: equest-users at lists.onebuilding.org
> Subject: Re: [Equest-users] eQuest Warning
>
> Along with the warning will be a series of numbers which are the curve
> coefficients.  If (in detailed mode) you go to "spreadsheet view" and
> look at the performance curves you can see the list of coefficients and
> can quickly identify which curve is going out of range.
>
> If I had to guess, I would guess it is a pump curve from a pump which is
> being allowed to autosize -- probably a hot water pump.
>
>
>> eQuest Users,
>>
>> I am modeling a large WSHP job with a separate CHW system for a large
>> computer room. Everything was going good after several simulations
>> when a series of warning messages appeared stating something about
> CURINV:
>> Result out of limits for CURVE: ... (see attached). I am still in the
>> DD Wizard.
>>
>> Can anyone assist on how to identify the culprit.
>>
>> Thanks
>> Bob Vogt
>> _______________________________________________
>> Equest-users mailing list
>> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
>> To unsubscribe from this mailing list send  a blank message to
>> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>>
>
>