[Equest-users] sequencing chillers using Equipment Controls

Mon Oct 29 15:18:10 PDT 2018

Hey guys,

I’ve run into this exact scenario before – answer was to develop the calibrated eQuest model to quantify savings for all other ECM’s, then export the hourly loop loads, temperatures, and weather data (needed to model OA-resets & tower interactions), into an 8760 spreadsheet model to wrap up the interactions with the WSE chiller.

Once built to a sufficient level of detail (At minimum: capture any TOU rate structures in play.  Ideally if time allows,  I would typically want to regress some custom performance curves, at least as detailed as what would be done in eQuest/doe2 if not more so… those regressions are relatively easy through Excel’s built in statistical analysis toolset), you can iteratively determine from your suggested starting point the logic resulting in a sweet spot for an optimal sequence of operations to minimize energy and/or dollars spent.

Sorry, that was a terrible sentence grammatically.  Hope it was interpretable!

~Nick

[cid:image001.png at 01D46FAB.5B16F930]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Regional Energy Engineering Manager
  Energy and Sustainability Services
  Schneider Electric

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

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

[cid:image002.png at 01D46FAB.5B16F930]

From: Equest-users <equest-users-bounces at lists.onebuilding.org> On Behalf Of Daric Adair via Equest-users
Sent: Wednesday, October 24, 2018 3:25 PM
To: Chris Hadlock <cjhadlock at gmail.com>; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] sequencing chillers using Equipment Controls

Chris;

The issue is not with Equipment Controls but with the Water Side economizer ‘chiller’.

I thought the water side economizer was an all or nothing element, so your mention of Equipment Controls gave me hope that someone had found a way around this limitation. But I’m afraid it wouldn’t appear that’s true.

Per the Help files ‘ Volume 2: Dictionary<mk:@MSITStore:c:\eQUEST%203-65%20Data\Help\DOE22\DOE-2.chm::/Docs/volume2dictionary.htm> > HVAC Components<mk:@MSITStore:c:\eQUEST%203-65%20Data\Help\DOE22\DOE-2.chm::/Docs/hvaccomponents.htm> > CHILLER<mk:@MSITStore:c:\eQUEST%203-65%20Data\Help\DOE22\DOE-2.chm::/Docs/chiller1.htm>’  and ‘Chiller Water-Economizer’ :
The program assumes a water-side economizer is used in an “all or nothing” mode. If the water-side economizer can handle the entire cooling load, then it will be used. Otherwise, the loop will use its other chillers. A water-side economizer cannot precool the return flow prior to entering the chillers.

The “all or nothing” mode precludes the use of an EQUIP-CTRL sequence to coordinate the operation of an economizer chiller with other chillers. If you list a water-side economizer chiller in an EQUIP-CTRL sequence, it will be ignored.
…

So, Sad day. Super creative – which is awesome and exciting. But can’t do it. bummer

Thanks,
DARIC R ADAIR PE, CEM, BEMP
Mechanical Engineer, Energy Analyst

Henderson Engineers
Tel (913) 742-5530
daric.adair at hendersonengineers.com<mailto:daric.adair at hendersonengineers.com>

Licensed in KS

From: Chris Hadlock <cjhadlock at gmail.com<mailto:cjhadlock at gmail.com>>
Sent: Tuesday, October 23, 2018 4:05 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] sequencing chillers using Equipment Controls

Hi All,

I'm using eQuest version 3.65 and am having trouble with sequencing my chillers - I've combed through the archives but haven't found anything that has helped.

I have 3 chillers in my model, a water-side economizing chiller and two air-cooled scroll chillers. I would like to control them such that my WS economizing chiller runs up to a certain capacity only (175 Tons = 2.1 MBtu/h). Without any controls, eQuest is ignoring the capacity I have entered, and is meeting my building's entire cooling load. Beyond the 2.1 MBtu/h, I would like my 2 other chillers to run to meet the remaining load.

I've created an Equipment Control (and selected it on my CHW loop) that has my WS Econo Chiller as sequence no. 1 with a max load of 2.1 (I believe units of MBtu/h). Then I have my other chillers as sequence 2/3 and left max loads as "999". I've played around with the "Max Load" values and also the "Loads Through" value and nothing I do changes the outcome. Is anyone able to help me figure out why eQuest is not capping my WS Econo Chiller at the 2.1 MBtu/h and why it continues to meet the entire cooling load (with a peak approaching 4 MBtu/h)?

Thank you in advance.

---
Chris Hadlock, M.A.Sc<https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fm.a.sc%2F&data=02%7C01%7Cnicholas.caton%40schneider-electric.com%7C05000517d0c547b912c508d639eec3c6%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C636760094982849898&sdata=O0yodzmEcs33D4X6WFOQqxn6qV43VPyK65cr3fUYoGI%3D&reserved=0>., P.Eng, LEED AP BD+C
Founder & Senior Energy Consultant

HADLOCK CONSULTING
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