[Equest-users] Secondary Chilled Water Loop has zero design flow

Tue Dec 8 15:59:07 PST 2020

Brian,

Thank you so much for helping me to understand the process. I truly
appreciate your time and effort.

Regards,

Morteza Kasmaei
Senior Architect
LEED AP BD+C, GGP

On Tue, Dec 8, 2020 at 8:58 AM Brian Fountain <
Brian.Fountain at sa-footprint.com> wrote:

> Morteza,
>
>
>
> There is a fundamental difference in the definition of a “secondary” loop
> between eQUEST and ASHRAE 90.1.
>
>
>
> In ASHRAE and customarily, a primary-secondary loop configuration involves
> one set of pumps for the chiller (or boiler) and a second set to pump
> through the building.
>
> *Image from pumpsandsystems.com <http://pumpsandsystems.com>*
>
>
>
> This can be primary-secondary can accomplished in eQUEST with a *single*
> circulation loop by adding pumps to the chiller as well as to the chilled
> water circulation loop.
>
>
>
> In the wizard:
>
>
>
> Which results in this configuration in the detailed interface.  CHW Loop
> Pump is the secondary loop pump while Chlr1 … Pump is the primary loop
> pump.
>
>
>
> The primary pumps can also be defined and added to the chiller in the
> detailed interface under the Loop Attachments tab.
>
>
>
>
>
> If only the circulation loop pumps* or *the pumps as a child to the
> chiller are defined you have a primary system.  if both the circulation
> loop pumps *and* the chiller child pumps are defined in eQUEST then you
> have a primary-secondary loop configuration.  So – to meet the
> primary-secondary configuration required by ASHRAE you need only define
> chiller pumps and chilled water loop pumps.
>
>
>
>
>
> By contrast, you can add subloops within eQUEST.  These subloops allow you
> to separate loads or carry loads at different temperatures.  For example,
> often we will put snow melting on a separate heating subloop  so that load
> can easily and explicitly be called out.  Unfortunately, these subloops are
> termed ‘secondary’ loops in eQUEST which seems to me to be creating the
> confusion.  The initial message suggests a chilled water subloop was
> created with no loads on it.  That triggered the message that eQUEST could
> not size the subloop.   My recommendation is to remove the subloop and
> ensure that chilled water loop pumps and chiller pumps have both been
> defined.
>
>
>
> Regards,
>
>
>
> Brian
>
>
>
>
>
>
>
> *Footprint *
> *Brian Fountain *Associate
>
> *From:* Equest-users <equest-users-bounces at lists.onebuilding.org> *On
> Behalf Of *Morteza Kasmai via Equest-users
> *Sent:* December 7, 2020 3:33 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Secondary Chilled Water Loop has zero
> design flow
>
>
>
> CAUTION: EXTERNAL SENDER
>
> Danny,
>
>
>
> Thank you for your suggestion.
>
>
>
> Regarding Appendix G requirements (G3.1.3.10) I was wondering if I should
> select the Secondary Chilled Water Loop for all the chilled water cooling
> coils (AHUs).
>
>
>
> I would appreciate hearing your thoughts on this.
>
>
>
> Morteza Kasmaei
> Senior Architect
>
> LEED AP BD+C, GGP
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> On Sun, Dec 6, 2020 at 12:01 AM <
> equest-users-request at lists.onebuilding.org> wrote:
>
> Send Equest-users mailing list submissions to
>         equest-users at lists.onebuilding.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>
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>
> or, via email, send a message with subject or body 'help' to
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>
> You can reach the person managing the list at
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>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Equest-users digest..."
> Today's Topics:
>
>    1. Re: Equest-users Digest, Vol 153, Issue 3 (Danny Xu)
>
>
>
> ---------- Forwarded message ----------
> From: Danny Xu <dannyxu576 at gmail.com>
> To: equest-users at lists.onebuilding.org
> Cc:
> Bcc:
> Date: Fri, 4 Dec 2020 17:43:57 -0500
> Subject: Re: [Equest-users] Equest-users Digest, Vol 153, Issue 3
> Hi Morteza,
>
> There is no system under "Secondary Chilled Water Loop" in your energy
> model.
>
> Selecting the "Secondary Chilled Water Loop" for a chiller water
> cooling system will fix the problem.  Or you can delete the "Secondary
> Chilled Water Loop" to fix it.
>
> Danny
>
> On Fri, 4 Dec 2020 at 16:41, <equest-users-request at lists.onebuilding.org>
> wrote:
> >
> > Send Equest-users mailing list submissions to
> >         equest-users at lists.onebuilding.org
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> >
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> >
> > or, via email, send a message with subject or body 'help' to
> >         equest-users-request at lists.onebuilding.org
> >
> > You can reach the person managing the list at
> >         equest-users-owner at lists.onebuilding.org
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Equest-users digest..."
> > Today's Topics:
> >
> >    1. Re: Equest-users Digest, Vol 153, Issue 1 (Morteza Kasmai)
> >
> >
> >
> > ---------- Forwarded message ----------
> > From: Morteza Kasmai <morteza.kasmai at gmail.com>
> > To: equest-users at lists.onebuilding.org
> > Cc:
> > Bcc:
> > Date: Fri, 4 Dec 2020 10:35:16 -0500
> > Subject: Re: [Equest-users] Equest-users Digest, Vol 153, Issue 1
> >
> > Dear all,
> >
> >
> > I would appreciate it if you would provide your thoughts/suggestions on
> the issue that I have with zero design flow in the secondary chilled water
> loop, as described in the email below.
> >
> >
> > Regards,
> >
> > Morteza Kasmaei
> > Senior Architect
> >
> > LEED AP BD+C, GGP
> >
> >
> > On Wed, Dec 2, 2020 at 1:45 AM <
> equest-users-request at lists.onebuilding.org> wrote:
> >>
> >> Send Equest-users mailing list submissions to
> >>         equest-users at lists.onebuilding.org
> >>
> >> To subscribe or unsubscribe via the World Wide Web, visit
> >>
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> >>
> >> or, via email, send a message with subject or body 'help' to
> >>         equest-users-request at lists.onebuilding.org
> >>
> >> You can reach the person managing the list at
> >>         equest-users-owner at lists.onebuilding.org
> >>
> >> When replying, please edit your Subject line so it is more specific
> >> than "Re: Contents of Equest-users digest..."
> >> Today's Topics:
> >>
> >>    1. Secondary Chilled Water Loop has zero design flow (Morteza Kasmai)
> >>
> >>
> >>
> >> ---------- Forwarded message ----------
> >> From: Morteza Kasmai <morteza.kasmai at gmail.com>
> >> To: equest-users at lists.onebuilding.org
> >> Cc:
> >> Bcc:
> >> Date: Tue, 1 Dec 2020 14:19:17 -0500
> >> Subject: [Equest-users] Secondary Chilled Water Loop has zero design
> flow
> >>
> >> Dear eQUEST experts,
> >>
> >>
> >> Attached are pd2 and inp files of the model that was built with eQUEST
> 3-65 7175 DOE 2.2.
> >>
> >> Although the secondary chilled water loop complies with G3.1.10&11
> requirements, when I run the model encounter the following error. Could you
> please let me know what I’m missing?
> >>
> >>
> >> ***ERROR************************************************************
> >>              Loop: Secondary Chilled Wate Loop       has zero design
> flow.
> >>              Check input for consistency, or specify design loads.
> >>
> >>
> >> ****** FATAL DESIGN ERRORS IN SYSTEMS ******
> >>
> >>
> >> Thank you for your time.
> >>
> >>
> >> Morteza
> >>
> >> Morteza Kasmaei
> >> Senior Architect
> >>
> >> LEED AP BD+C, GGP
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> Equest-users mailing list
> >> Equest-users at lists.onebuilding.org
> >> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> >
> > _______________________________________________
> > Equest-users mailing list
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> > http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
>
> _______________________________________________
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>
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