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Re: [EnergyPlus_Support] question about Energy Recovery Ventilator: Stand Alone
I have determined that you can add a fan to your heat exchanger. You
will need to define a branch with the fan (and you will need another fan
object) and include that branch in the branch list. It appeared to work
when I tested this configuration.
BRANCH LIST,
Air Loop Branches, !- Branch List Name
Air Loop Main Branch, !- Branch Name 1
Exhaust Branch;
BRANCH,
Exhaust Branch,
1.3, ! your mass flow rate
FAN:Simple:VariableVolume, !- Comp3 Type
Supply Fan 2, !- Comp3 Name
Heat Recovery Secondary Outlet Node, !- Comp3 Inlet Node Name
Exhaust Node, !- Comp3 Outlet Node Name
ACTIVE; !- Comp3 Branch Control Type
Richard Raustad wrote:
> The Stand Alone ERV is modeled as a piece of zone equipment and should
> only be used with other zone equipment objects. Stand alone actually
> refers to the fact that it is not connected to an air loop. For
> instance, if you have a window AC unit (zone equipment) conditioning a
> single zone you can also have a stand alone ERV connected to that zone.
> This model can not be used with unitary equipment installed in an air
> loop if the zone the stand alone ERV serves is connected to the
> thermostat zone controlling the air loop equipment. You should be able
> to connect it to any other zone connected to that air loop (except the
> thermostat zone). If you do this you will have to adjust (increase) the
> supply air flow rate to this zone to pick up the additional load
> contributed by the ERV. If your modeling a school and the air loop does
> not condition the gymnasium, then you can attach a stand alone ERV to
> the gymnasium.
>
> If all zones are connected to an air loop then use the Heat
> Exchanger:Air to Air object connected to the air loop (e.g. supply side
> of the heat exchanger in the air loop; exhaust side inlet node of the
> heat exchanger connected to the relief air node of the outside air
> system and exhausted to outdoors) to perform the energy recovery. After
> reading you other email message (shown below for reference), I believe
> you are trying to simulate this configuration. You can not include an
> exhaust fan if you connect the exhaust side of the heat exchanger to the
> outside air mixer relief node. The flow rate of the relief node is set
> by the outdoor air mixer object, not a fan.
>
> You may try connecting all zone exhausts to a mixer and passing that air
> stream through a fan and then through the exhaust side of the heat
> exchanger. You will probably be the first person to try this and I
> would be interested to know how it turns out.
>
> Good Luck.
>
> Other email message:
> I am modeling a single zone building with a unitary
> system:blowthrough:heatcool. I have a air-air heat recovery to
> recover the heat from the exhaust air. I have built a supply fan in
> the unitary system. In addition, I want to have an exhaust fan. I am
> not sure whether I can implement that in EnergyPlus or not.
>
>
> zhaicq98 wrote:
>
> > Hi,
> >
> > I am not so sure that I understand the component ERV:stand alone. Can
> > it be used together with other equipment such as unitary equipment?
> > Does "stand alone" mean this is the only HVAC component for a zone?
> >
> > Thanks.
> >
> >
> >
> >
> >
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> >
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> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
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--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
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