[Equest-users] Modeling Reverse Acting TStat EF

[Chris Jones via Equest-users]

I have modeled this situation using a PSZ system with the supply flow the same as the exhaust flow. The fan schedule is always off with night cycle on any. Cooling is always available but no cooling capacity. The fan power is equal to the exhaust fan power. The minimum OA fraction is 1.

The only issue is that the system won’t cycle on for cooling unless there is a realistic cooling load in the space. That is the trickiest part to figure out.


Christopher Jones, P. Eng.
Rowan Williams Davies & Irwin Inc.
Consulting Engineers & Scientists
901 King Street West, Suite 400, Toronto, Ontario, M5V 3H5
T: (519) 823-1311 ext 2052
M: (416) 697-0056

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Darryl Kasun via Equest-users
Sent: Saturday, October 15, 2016 2:57 PM
To: equest
Subject: [Equest-users] Modeling Reverse Acting TStat EF

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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