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[EnergyPlus_Support] Re: is it possible to model 2 air loops

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: is it possible to model 2 air loops
From: "Elreq" <tolteca33@xxxxxxxxx>
Date: Tue, 24 Feb 2009 15:39:00 -0000
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Hello,

I tried to connect the loops as you suggest but it does not seem to
work the way I want it: I would like to have the possibility that the
main loop has two outside air nodes: one representing the real outside
air (fresh air) and the second one representing the outlet air node of
the other loop. Somehow I should need an additional inlet node on the
Heat Recovery Unit or in the Mixing Box. 
Any other suggestions?

Tks,
Santiago

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad
<RRaustad@...> wrote:
>
> I have not tried that. You will probably have to delete the Outside Air 
> Node List object for the 1st mixing box OA node. And the OA flow rate 
> leaving the relief node of one box should be the same as the OA inlet 
> node flow rate on the 1st box.
> 
> Let me know what happens.
> 
> Elreq wrote:
> >
> >
> > Hello!
> >
> > I finally managed to work it out. Now I have the two loops but I
> > wonder if there is a way to connect the relief outlet of one of them
> > to the mixing box of the 1st one.
> >
> > The other option would be to use a mixing object but is not what the
> > real situation.
> >
> > Thanks in advance.
> > Santiago
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> > <RRaustad@> wrote:
> > >
> > > Is that node name used in the OutdoorAir:Mixer object ? If you can't
> > > find the error you will have to upload your file so someone can
take a
> > > look at it.
> > >
> > > Elreq wrote:
> > > >
> > > > This node is defined in an outisde air node list:
> > > >
> > > > OUTSIDE AIR INLET NODE LIST,
> > > > AHU Outside Air Inlet; !- 1st Node name or node list name
> > > >
> > > > Regards,
> > > > Santiago
> > > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> > > > <RRaustad@> wrote:
> > > > >
> > > > > Did you define this node as an outdoor air node or list this
> > node in an
> > > > > outdoor air node list ?
> > > > >
> > > > > OutdoorAir:Node,
> > > > > AHU OUTSIDE AIR INLET; !- Name
> > > > >
> > > > > ...or...
> > > > >
> > > > > OutdoorAir:NodeList,
> > > > > OutsideAirInletNodes; !- Node or NodeList Name 1
> > > > >
> > > > > NodeList,
> > > > > OutsideAirInletNodes, !- Name
> > > > > AHU OUTSIDE AIR INLET; !- Node 1 Name
> > > > >
> > > > >
> > > > > Elreq wrote:
> > > > > >
> > > > > > The error is:
> > > > > > Node Connection Error, Node="AHU OUTSIDE AIR INLET", Actuator
> > node did
> > > > > > not find a matching node of appropriate type (other than
Actuator,
> > > > > > Sensor, OutsideAir).
> > > > > > ** ~~~ ** Reference Object=CONTROLLER:OUTSIDE AIR, Name=AHU OA
> > > > > > CONTROLLER.
> > > > > >
> > > > > > This controller is for the AHU Loop which was alreay working
> > fine so
> > > > > > when I added the second loop for a special zone I receive this
> > error.
> > > > > >
> > > > > > Thanks.
> > > > > >
> > > > > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > > > <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> > > > > > <RRaustad@> wrote:
> > > > > > >
> > > > > > > Yes, you may use more than one air loop. Each air loop must
> > serve
> > > > > > > different zones. What is the strange error ?
> > > > > > >
> > > > > > > Elreq wrote:
> > > > > > > >
> > > > > > > >
> > > > > > > > Dear Forum,
> > > > > > > >
> > > > > > > > I have a similar question,
> > > > > > > >
> > > > > > > > Is it possible to define two air loops but not for the
same
> > > > zone: one
> > > > > > > > is for several zones and has reheat coils and the
other one is
> > > > for a
> > > > > > > > separate zone only using direct air.
> > > > > > > >
> > > > > > > > I am trying to do it but receive very strange severe
errors.
> > > > > > > >
> > > > > > > > Thanks,
> > > > > > > > Santiago
> > > > > > > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx 
> > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > > > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > > > > > <mailto:EnergyPlus_Support%40yahoogroups.com>, Fred Buhl
> > <wfbuhl@>
> > > > > > > > wrote:
> > > > > > > > >
> > > > > > > > > It is not possible. One airloop, plus as much zone
equipment
> > > > as you
> > > > > > > > want.
> > > > > > > > >
> > > > > > > > > Fred Buhl
> > > > > > > > >
> > > > > > > > > D T wrote:
> > > > > > > > > > Does anyone know if it possible to have 2 air loops
> > > > servicing the
> > > > > > > > same
> > > > > > > > > > zone? I currently have one air loop defined for the
> > > > largest zone
> > > > > > > > in my
> > > > > > > > > > facility and am trying to add another one but am
trying to
> > > > > > figure out
> > > > > > > > > > how to connect the nodes on the demand side since
that is
> > > > where my
> > > > > > > > > > problem lies.
> > > > > > > > > >
> > > > > > > > > > Thanks,
> > > > > > > > > > Dimos
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > > --
> > > > > > > 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 
> > <http://www.fsec.ucf.edu>
> > > > <http://www.fsec.ucf.edu <http://www.fsec.ucf.edu>>
> > > > <http://www.fsec.ucf.edu <http://www.fsec.ucf.edu> 
> > <http://www.fsec.ucf.edu <http://www.fsec.ucf.edu>>>
> > > > > > >
> > > > > > > UCF - From Promise to Prominence: Celebrating 40 Years
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > > --
> > > > > 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 
> > <http://www.fsec.ucf.edu>
> > <http://www.fsec.ucf.edu <http://www.fsec.ucf.edu>>
> > > > >
> > > > > UCF - From Promise to Prominence: Celebrating 40 Years
> > > > >
> > > >
> > > >
> > >
> > > --
> > > 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
<http://www.fsec.ucf.edu>
> > >
> > > UCF - From Promise to Prominence: Celebrating 40 Years
> > >
> >
> > 
> 
> -- 
> 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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References:
- Re: [EnergyPlus_Support] Re: is it possible to model 2 air loops
  - From: Richard Raustad

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