[Equest-users] waterside economizer in eQuest

[James D. Waechter]

How about changing the system type to VAV and adding the waterside
economizer coil?  For instance, if the system type is supposed to be fan
coils, you could set the minimum fan speed to 1.00, minimum air fraction
to 1.00, set your minimal static pressure on the fan- maybe 0.25" or so,
zero out the pressure drop across the "economizer coil", and zero out
additional heat gain from the fan due to the "economizer coil".

 

Does anyone have experience with this methodology producing reliable
results compared to the methodology suggested in previous posts?  Any
feedback is appreciated.

 

James D. Waechter, P.E., LEED A.P.

Beaudin Ganze Consulting Engineers

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________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Fred
Porter
Sent: Monday, July 28, 2008 3:53 PM
To: Steve Mignogna; Brian Fountain
Cc: equest-users at lists.onebuilding.org; Marcus Eliason
Subject: Re: [Equest-users] waterside economizer in eQuest

 

No, that's not required. If the WSE-"Chiller" is listed with the
chillers on a loop, DOE-2 will use it when conditions allow.
"Conditions" include CHW temperature, so reset up of CHW if possible
maximizes the modeled use of the WSE. 

>>> Brian Fountain <bfountain at greensim.com> 7/28/2008 2:12 PM >>>
Further to this -- you will likely need to set up your equipment 
controls to specify the water economizer chiller type leading in the 
winter (below a certain OA) and the regular chillers leading above a 
certain OA -- or based on a schedule.

Steve Mignogna wrote:
> You can set up a separate chiller of type "water economizer".  This 
> will attach to your CHW and CW Loops and will bypass the chiller and 
> circulate through your cooling tower when the outside air conditions 
> are acceptable for free cooling.
>
>
>
> On Fri, Jul 25, 2008 at 11:13 AM, Marcus Eliason <meliason at essexco.com

> <mailto:meliason at essexco.com>> wrote:
>
>
>     Hello,
>
>     Can someone please explain the proper way to model a waterside
>     economizer in
>     eQuest?  I have found the option for a cooling tower with HX, but
>     this does
>     not seem to yield any results.
>
>     Thank you,
>
>     Marcus Eliason
>     Essex Engineering Corporation
>     404.365.9482
>     meliason at essexco.com <mailto:meliason at essexco.com>
>
>
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>
>
>
> -- 
> Steve Mignogna
> Atelier Ten
>
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