[Equest-users] CHW error message

[Chris Lowen]

James -

I've had some luck getting around this one by applying reset schedules to the chilled water loop supply temperature so the "Design CHW Temp" defined on the "Basic Specifications" tab meets the 6 degree difference requirement, and then on the "Controls" tab set up a reset schedule that will reset the temperature of the chilled water loop to what you actually want the system running at.

Cheers
Chris

Chris Lowen
Energy Analyst
LEED AP BD+C

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of James Hansen
Sent: Thursday, December 15, 2011 2:43 PM
To: thomasv at iit.edu; Robby Oylear
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] CHW error message

Does anyone know if there is a way to bypass or ignore this error?  I've worked on a few projects recently where we've been able to get close to a 46 degree LAT from an AHU with 42 degree water.  Not a big deal I guess, but it would be nice to be able to be only 4 degrees above CHW temp.

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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Varkie C Thomas
Sent: Thursday, December 15, 2011 5:44 PM
To: Robby Oylear
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] CHW error message

Robby: This project is being done by an architect who used DD.  I looked for the error in CHW plant and forgot to look at HVAC supply temps.  I was mistaken, the Detailed Edit does allow you to set CHWS temp but not SD and DD.  Varkie
----- Original Message -----
From: Robby Oylear <robbyoylear at gmail.com<mailto:robbyoylear at gmail.com>>
Date: Thursday, December 15, 2011 4:29 pm
Subject: Re: RE: [Equest-users] CHW error message
> Whoops, here's the image I meant to send with the detailed edit
> screen:[image: image.png]
>
> On Thu, Dec 15, 2011 at 2:29 PM, Robby Oylear
> <robbyoylear at gmail.com<mailto:robbyoylear at gmail.com>> wrote:
>
> > Varkie,
> >
> > On wizard screen 3 of 3 under "CHW Plant Equipment" the setpoint is
> > defined.  The default is 44 deg F.
> >
> > [image: image.png]
> >
> > In detailed edit mode this setpoint can be seen on the
> "Circulation Loop
> > Properties" screen:
> > [image: image.png]
> >
> > On Thu, Dec 15, 2011 at 2:22 PM, Varkie C Thomas
> <thomasv at iit.edu<mailto:thomasv at iit.edu>> wrote:
> >
> >> Kelsey, Robby,
> >>
> >> Thanks.  The supply air temp was too low.  What CHWS temp does
> eQUEST>> assume?  This should be an input value too, besides temp
> rise.>>
> >> Varkie
> >> **
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