[Equest-users] Secondary Chilled Water Loop has zero design flow
Brian Fountain
Brian.Fountain at sa-footprint.com
Tue Dec 8 05:58:45 PST 2020
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. [cid:image002.png at 01D6CD3F.FB514790]
Image from 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:
[cid:image004.png at 01D6CD3F.FB514790]
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.
[cid:image005.png at 01D6CD3F.71592670]
The primary pumps can also be defined and added to the chiller in the detailed interface under the Loop Attachments tab.
[cid:image010.png at 01D6CD3F.FB514790]
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<mailto:equest-users-request at lists.onebuilding.org>> wrote:
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From: Danny Xu <dannyxu576 at gmail.com<mailto:dannyxu576 at gmail.com>>
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Cc:
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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<mailto:equest-users-request at lists.onebuilding.org>> wrote:
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> than "Re: Contents of Equest-users digest..."
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> 1. Re: Equest-users Digest, Vol 153, Issue 1 (Morteza Kasmai)
>
>
>
> ---------- Forwarded message ----------
> From: Morteza Kasmai <morteza.kasmai at gmail.com<mailto:morteza.kasmai at gmail.com>>
> To: equest-users at lists.onebuilding.org<mailto: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<mailto:equest-users-request at lists.onebuilding.org>> wrote:
>>
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>>
>> or, via email, send a message with subject or body 'help' to
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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:
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>> 1. Secondary Chilled Water Loop has zero design flow (Morteza Kasmai)
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: Morteza Kasmai <morteza.kasmai at gmail.com<mailto:morteza.kasmai at gmail.com>>
>> To: equest-users at lists.onebuilding.org<mailto: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
>>
>>
>>
>>
>>
>>
>>
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