[Equest-users] Chiller sequencing

Nicholas Caton ncaton at catonenergy.com
Fri Aug 21 11:37:56 PDT 2015

Of particular interest, I think your exact situation is covered nicely by:

Volume 3: Topics > Central Plant Components > LOAD-MANAGEMENT and
EQUIP-CTRL > Examples of EQUIP-CTRL and LOAD-MANAGEMENT Sequences > Example
1:  Chiller Staging

That said, after you’ve reviewed the literature, you might first set up
some hourly reporting (assigned load for each chiller) before messing with
EQUIP-CTRL settings at all.  If you have two identical chillers, I am 99%
certain they will behave exactly as you’ve described.  That is, chiller A
will handle the first 400 tons of load, then for hours with 401 tons and
upwards the two chillers will share the load 50/50.  The only nuance to add
is that, again assuming they are identical, the chiller that is engaged
first will be determined by the which occurs first in the .inp.

Best regards,



*Caton Energy Consulting*
  306 N Ferrel

  Olathe, KS  66061

  office:  785.410.3317


*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
Behalf Of *Jones, Christopher
*Sent:* Friday, August 21, 2015 7:49 AM
*To:* 'Sambhav Tiwari'; equest-users
*Subject:* Re: [Equest-users] Chiller sequencing


I suggest reviewing the DOE22 Manuals.  DOE33Vol3-Topics contains a
detailed section on load management and equipment sequencing.

The manuals can be downloaded at http://doe2.com/download/doe-22/

Download the latest versions of the pdf files.

[image: cid:image003.png at 01D09C46.E75BA0D0]

*Christopher Jones,* P.Eng.
Senior Engineer

*WSP Canada Inc.*

2300 Yonge Street, Suite 2300

Toronto, ON M4P 1E4
T +1 416-644-4226

F +1 416-487-9766

C +1 416-697-0065


*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
<equest-users-bounces at lists.onebuilding.org>] *On Behalf Of *Sambhav Tiwari
*Sent:* Friday, August 21, 2015 6:12 AM
*To:* equest-users
*Subject:* [Equest-users] Chiller sequencing

Dear Equesters,

I have a building with 800TR load and 2 chillers of 400TR each . In actual
design the chiller sequencing is in such way that

for 0 to 400TR chiller 1 will operate

for load between 400TR to 800TR  both chillers will run under 50% of total
building load ie the building load is say 500TR so chillers wil operate
like 250TR for each 1&2. not like 400TR for chiller 1 and 100TR for chiller

How can i do such sequencing in equipment control.

I shall wait for your valuable response.


Sambhav Tiwari

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