[Equest-users] Heat Recovery Control

Mon Mar 14 12:33:25 PDT 2016

Thanks Nick and Patrick.  Those are two much better options.  Now I'm
curious to see what effect the 8760 schedule will have on performance since
I've always tried to stay clear of this method.  Right now I have about
3500 components in the model, so adding another 52 + 365 components should
be relatively tolerable in terms of load time.  I'd also like to see what
the effect on simulation time will be.  The biggest drawback for me is that
the schedules section of the Component Tree will become very bloated and
possible un-navigatable, so I can see why this might need to wait until the
end.

It just occurred to me that I could also run 2 separate parametric runs:
one which locks out above the exhaust air temperature (72) and the other
that locks out 17 degrees below the exhaust temperature (55).  I would
think the results should be additive.

Aaron

On Mon, Mar 14, 2016 at 1:52 PM, <Nicholas.Caton at schneider-electric.com>
wrote:

> I did *exactly* this for a recent job for the same reasons (lockouts
> between setpoints for heat recovery operation).
>
>
>
> The only extra caution is – this is actually very easy to do, but be
> mindful you’ll end up adding approximately 400 components to your model
> after import (between the day/week/annual schedules).  If your model is
> already in or certain to reach “overweight” territory in terms of
> loading/simulation times, it may be advisable to push this towards the end
> of your to-do list for model development (if feasible).
>
>
>
> If you want to more quickly/lightly *approximate* the savings for all
> seasons, you could run an hourly of your exhaust air temps at the heat
> recovery to come up with an annual median, then consider that exhaust
> temperature in relation to your 55/72 “lockout targets” to come up with an
> “averaged absolute annual differential” to use in combination with
> ERV-RECOVER-MODE = OA-HEAT/COOL.  This will deliberately overstate cooling
> recovery + understate heating recovery operation (or vice versa), but would
> hopefully ballpark what’s happening on an annual savings basis well
> enough.
>
>
>
> You could also “tune” the “light” approach to adjust the delta input in
> combination with a model fork using the “imported spoon-fed operation”
> approach (you may want to develop that schedule anyway for eventual
> import/use, so it wouldn’t be wasted time), but again I’d probably be
> inclined to ultimately land on that more “locked in” solution and just plan
> my model development around doing that last or towards the end.
>
>
>
> ~Nick
>
>
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> *Nick Caton, P.E.*
>
>   Senior Energy Engineer
>   Energy and Sustainability Services
>   North America Operations
>   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
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> United States
>
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>
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>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Lapierre, Patrick
> *Sent:* Monday, March 14, 2016 12:06 PM
> *To:* Aaron Powers; equest-users at lists.onebuilding.org
> *Subject:* Re: [Equest-users] Heat Recovery Control
>
>
>
> One way to do it would be to build a custom 8760h schedule using the
> schedule excel tool produced by EMIT (attached).
>
> You output the outside temp of your meteo file and manually set them to
> On/Off according to the outside temps you mentionned below (0 between 55
> and 72, 1 otherwise).
>
> Then you import the schedule in your model and set your ERV to run
> according to this schedule.
>
>
>
> It’s a little longer but it will do exactly what you want to.
>
>
>
>
>
> [image: Bouthillette Parizeau] <http://www.bpa.ca/>
>
> *Patrick* *Lapierre**_ing.*
>
> plapierre at bpa.ca
>
>
>
> *De :* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
> <equest-users-bounces at lists.onebuilding.org>] *De la part de* Aaron Powers
> *Envoyé :* 14 mars 2016 12:56
> *À :* equest-users at lists.onebuilding.org
> *Objet :* [Equest-users] Heat Recovery Control
>
>
>
> I'm trying to model a heat recovery device on a 100% OA VAV unit.  The
> supply air temperature setpoint is a constant 55 F throughout the year.  To
> maximize the savings, we will be locking out the heat recovery when the
> outside air is between 55 and 72 F.  When the outside drybulb is less than
> 55, we will have pre/re-heat savings, and when the outside drybulb is
> greater than 72 we will have sensible cooling savings.  The closest control
> scheme that I can find to this in eQuest is to set ERV-RUN-CTRL = "OA
> Exhaust DT", set ERV-RECOVER-MODE = "OA Cooling" and OA-EXHAUST-DT = 0.
> But unfortunately, this will not pick up the heating savings.
>
> Does anyone know of a better way to model this control?
>
> Aaron
>
>
> ______________________________________________________________________
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-- 
Sent from my DynaTAC 8000x
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