[Equest-users] DOE 2.3 Water-side Economizer in Series

Thu Jul 7 12:36:14 PDT 2016

Thanks for the reply Nick!

I did a little more research and found that DOE 2.3 only allows the water-side economizer to be 'upstream,' so I don't need to explicitly state this as an input. Therefore, I switched my CHW Loop back to Parallel which operates my chillers appropriately, and the economizer will automatically operate 'upstream' from them. I'm now exploring the hourly reports to verify the loop's operation is actually doing what I want it to.

Fortunately, you may not have to 'roll your own' anymore.

I'll keep you posted.

[ARCH | NEXUS]<http://www.archnexus.com>
DAVID W. GRIFFIN II
BEMP
ENERGY ANALYST
2505 E Parleys Way
Salt Lake City, UT 84109
Office 801.924.5028
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From: Nicholas.Caton at schneider-electric.com [mailto:Nicholas.Caton at schneider-electric.com]
Sent: Thursday, July 07, 2016 1:10 PM
To: David Griffin II
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] DOE 2.3 Water-side Economizer in Series

I gave the series chiller configurations a cursory overview a month or so back when I first saw it in the documentation.  I haven't tried putting it to practice just yet myself.

A factor that's possibly in play:  I think this is a case where the engine (doe2.3) is presently a bit ahead of the interface (eQUEST), so leveraging these series configurations will necessitate manual INP additions/edits behind what eQuest can currently display & permit to edit.  Those inputs should stick around, but be mindful some actions in eQUEST (such as removing & re-creating chillers/loops, or changing types) could have the effect of stripping the associated inputs in the INP - so it's something to keep an eye on.  Perhaps reason enough to push this towards the end of your development timeline.

I don't have the most-current version of 3.65 presently installed, so I can't easily verify, but I think what you might need to do is to assign your economizer chiller as "UPSTREAM" in the INP file - note the missing CHW-SERIES-LOCN keyword present in the other two chillers:
[cid:image003.png at 01D1D854.26704740]

There is some more explicit documentation regarding the new keywords and inputs somewhere between the new 3.65's documentation and the "what's new" PDF...  I can't recall immediately but finding and reviewing that against your INP is the natural next step.

Worth mentioning:  I also am not terribly clear on how well the native WATER-ECONOMIZER chiller works in the most current version, and whether it has advanced beyond its previous operational trappings... you may want to monitor behavior carefully to be sure it's acting as you'd expect in any case.  As you might know I'm a proponent of "rolling my own" waterside economizer chillers with load-management/sequencing for more operational control... write-ups on procedure are floating about in the archives ;).

Best of luck, and let us know how this shakes out!

~Nick
[cid:image004.png at 01D1D854.26704740]
Nick Caton, P.E.
  Senior Energy Engineer
  Energy and Sustainability Services
  North America Operations
  Schneider Electric

D  913.564.6361
M  785.410.3317
E  nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>
F  913.564.6380

15200 Santa Fe Trail Drive
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[cid:image001.png at 01D189AB.58634A10]

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of David Griffin II via Equest-users
Sent: Thursday, July 07, 2016 11:50 AM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] DOE 2.3 Water-side Economizer in Series

I'm working on a model which has two chillers in parallel with a water-side economizer in series to both of them; i.e. the economizer is 'upstream' and the chillers are 'downstream.'

I know DOE 2.2 will not allow this configuration to be explicitly modeled, but after some research, it appeared DOE 2.3 would (see page 83 of DOE 2.3 Manual).

When I get things setup (CHW Loop in SERIES, Chillers in DOWNSTREAM) the keyword to place the economizer UPSTREAM is unavailable, and the run errors out with "No upstream equipment specified."

I have attached the INP and PD2 file for reference. You may find it interesting in this model that I have more than one system assigned to a single zone (Thanks for adding this eQUEST team!).

Am I being overly optimistic about what DOE 2.3 can do, or am I missing something? Has anyone else tried to model this in DOE 2.3 and been successful?

Let me know.

Thanks,

[ARCH | NEXUS]<http://www.archnexus.com>

DAVID W. GRIFFIN II

BEMP
ENERGY ANALYST

2505 E Parleys Way
Salt Lake City, UT 84109

Office 801.924.5028

archnexus.com<http://www.archnexus.com>

[Twitter]<https://twitter.com/arch_nexus>[Facebook]<https://www.facebook.com/pages/Architectural-Nexus/179588705397563?ref=ts&fref=ts>[Youtube]<https://www.youtube.com/channel/UCYRPWKF-yp-AUiI8ia2XfKw?feature=mhee>[LinkedIn]<https://www.linkedin.com/company/architectural-nexus>

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