[Equest-users] Modeling Reverse Acting TStat EF

[Brian Fountain via Equest-users]

Does this mean the exhaust fan can cycle based on zone temperature?   I had thought that the exhaust fan schedule was just on/off, on/off/flag and fraction. That means you have to pre-define the expected schedule rather than having the EF respond to the hourly space timestep temperature. 

What we have done in the past is to model the EF as a PSZ with the fan power as the supply fan power and the "indoor fan mode" as intermittent. Cooling capacity set to a small non-zero value (as zero invokes auto-sizing). 



  Original Message  
From: Nicholas Caton via Equest-users
Sent: Monday, October 17, 2016 10:39 AM
To: Julien MARREC; Darryl Kasun
Reply To: Nicholas Caton
Cc: equest-users
Subject: Re: [Equest-users] Modeling Reverse Acting TStat EF

From: Nicholas Caton
Sent: Monday, October 17, 2016 9:38 AM
To: 'Julien MARREC' <julien.marrec at gmail.com>; Darryl Kasun <darryl.kasun at gmail.com>
Subject: RE: [Equest-users] Modeling Reverse Acting TStat EF

Yep - Julien has the right idea!

The other input of interest for your case is that at the same input screen, you can select the exhaust source as "infiltration," which means the associated makeup airstream = outside conditions.

~Nick

Nick Caton, P.E., BEMP
Senior Energy Engineer
Energy and Sustainability Services
Schneider Electric
D 913.564.6361
M 785.410.3317
E nicholas.caton at schneider-electric.com
F 913.564.6380
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States



-----Original Message-----
From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Julien MARREC via Equest-users
Sent: Saturday, October 15, 2016 3:41 PM
To: Darryl Kasun <darryl.kasun at gmail.com>
Cc: equest <equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Modeling Reverse Acting TStat EF

Zonal exhaust fan has an option to control that on a temp schedule if I recall correctly.

Open the zone, tab "outside air" then at the right you can specify a zonal exhaust fan. (All this from memory so might differ slightly)

Cheers,
Julien

Envoyé de mon iPhone

> Le 15 oct. 2016 à 20:57, Darryl Kasun via Equest-users <equest-users at lists.onebuilding.org> a écrit :
>
> Hi eQUESTers,
>
> First off, you probably will not likely appreciate this and I'll preface this with saying that I'm a total bandwagon jumper but I am okay with that.
>
> GO JAYS!!!
>
> Now that that's out of the way I am trying to model a very simple system that I'm sure many of you have modeled before.
>
> I have a zone that has an exhaust fan in it. When the temp. reaches above 80 degF, an exhaust fan turns on and a damper opens to draw OA into the zone.
>
> I've been fooling around with a few systems trying to figure out a good way to model this but haven't come up with one yet.
>
> Let me know if have any recommendations.
>
> Thanks!
> Darryl
>
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