[Equest-users] How Does the Chiller Water Economizer Work by Itself?

Sun Dec 17 07:38:29 PST 2017

Hi Kathryn,

I will give a small input which can or may work.
As per my experience the way to have have a work with which can be useful.
The violation error is due to the factor that the Cooling side DELTA-T is
not more than 6 degree Fahrenheit in the thermal zone SZRH1b.
As per industrial practice you can have an input of 10 degree Fahrenheit in
the Loop Design Delta-T in the Chilled water loop side window.
Also you can keep low values of Design-CHW Temperature to have a work with.
Hope this might also help.

*Thanks,*
*Sharad.Kumar*.
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On Fri, Dec 15, 2017 at 6:13 AM, <equest-users-request at lists.onebuilding.org
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Today's Topics:

   1. Re: How Does the Chiller Water Economizer Work by Itself?
      (Bishop, Bill)

---------- Forwarded message ----------
From: "Bishop, Bill" <bbishop at pathfinder-ea.com>
To: Kathryn Kerns <kathryn.kerns at bceengineers.com>
Cc: "equest-users at lists.onebuilding.org" <equest-users at lists.onebuilding.org
>
Bcc:
Date: Thu, 14 Dec 2017 23:09:10 +0000
Subject: Re: [Equest-users] How Does the Chiller Water Economizer Work by
Itself?

Hi Kathryn,

eQUEST has two types of water economizers:

-        Chillers of TYPE:WATER-ECONOMIZER

-        Airside cooling coil SYSTEM:WS-ECONO accessible in System ->
Cooling Tab -> Economizer Tab

The system-level water-side economizer is a coil attached to a
condenser-water loop. That option is the one that is not currently
implemented in DOE-2.3.

The WATER-ECONOMIZER chiller is usable in DOE-2.3 and has updated
capabilities in eQUEST 3.65.

The error message shown below is common and can apply to any CHW coil – not
just water economizers. The error is generated by a combination of system
MIN-SUPPLY-T, fan SUPPLY-DELTA-T and FAN-PLACEMENT, and CHW loop
DESIGN-COOL-T.

Regards,

~Bill

*William Bishop, PE, BEMP, BEAP, CEM, LEED AP **|** Pathfinder Engineers &
Architects LLP*

*Senior Energy Engineer*

134 South Fitzhugh Street                 Rochester, NY 14608

*T: (585) 698-1956*                        F: (585) 325-6005

bbishop at pathfinder-ea.com <wbishop at pathfinder-ea.com>
www.pathfinder-ea.com

[image: http://png-5.findicons.com/files/icons/977/rrze/720/globe.png]Carbon
Fee and Dividend - simple, effective, and market-based.

*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
Behalf Of *Kathryn Kerns via Equest-users
*Sent:* Tuesday, November 14, 2017 7:47 PM
*To:* equest-users at lists.onebuilding.org
*Subject:* [Equest-users] How Does the Chiller Water Economizer Work by
Itself?

Everyone,  I am told that the water economizer function attached to the
PVVT and other HVAC systems isn’t supported by eQuest anymore although it
does appear to work and produce reasonable answers. Is this correct? If so
is there some other way of introducing a water economizer to a zone for
cooling purposes? I have attached a *.inp file with a water tower,
condenser loop, water economizer chiller, chw loop attached to a SZRH
system in an interior zone with a 10 w/sqft process load and an 80 F
cooling setpoint. It is computer server room. I want this cooling system to
cool the interior space as much as possible but I can’t figure out to get
the loops to even run, let alone cool. The error message that shows up is:

If there is no regular chiller, only the water economizer, does anybody
know what condenser, chilled water loop and water economizer parameters you
have to set to get this to work? Surely the model should run and cool the
zone somewhat?

And can someone tell me why the water economizer function is not supported?
It seems to work.

I would really like to hear from the folks who supports the eQuest software
because I find all this very confusing.

*Kathryn Kerns*

*Systems Specialist*

*BCE* *Engineers, Inc.*

*| Ph: 253.922.0446 | Fx: 253.922.0896 |*

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