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Re: [EnergyPlus_Support] Re: how to change the outdoor air flow rate?
See documentation for Controller:MechanicalVentilation. Use this object
with Controller:OutdoorAir. This equipment will typically be used with
air loop HVAC systems. Also see example file HeatPumpSimpleDCV.idf.
yunpeng.hu wrote:
>
> Hi, Raustad, thank for your reply!
>
> Maybe I misunderstand the difference between the "system" and
> the "zone".
>
> I describe the problem as the following after reading your and
> others' relative messages.
> I want to simulate an DOAS system that server several zones, and to
> see the energy saving of that system.
> If the occupancy of each zone is fixed, that means when there are
> people in the zone the number will not change, the
> SingelDuct:ConstantVolumn can be useful. And the Airloop system flow
> rate would be the sum of all the zones.
> Actually, the occupancy isn't fixed. For example, there would be 1
> person from 1:00~2:00 and 3 from 4:00~5:00, so the outdoor air flow
> rate of each zone would be variable. Then the OA flow rate of the
> airloop system would change consequently.
> Because the zone OA flow rate varies as the number of person multiply
> the basic OA flow rate of one person and is not autosizing, the
> PROBLEM is there.
>
> which Air Distribute Equipment can I choose to let the zone OA flow
> rate vary with the change of occupancy.
> Or, can I use an Air Distribute Equipment that still have an OA Mixer
> which could be controled by the Controller:OutdoorAir, even though
> the Airloop system already has an OA Mixer? --The OA Mixer of a zone
> use to change the OA flowrate into the zone, and the OA Mixer of a
> system can use to control the 100% outdoor air.
>
> Thanks in advance!
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> <RRaustad@...> wrote:
> >
> > See documentation for the Schedule:File object. You should be able
> to
> > set the OA system min and max flow rate to be the same, use fixed
> > minimum flow rate, and then use a schedule (Controller:Outdoor Air -
>
> > field Minimum Outdoor Air Schedule Name) to calculate the OA
> system's
> > actual minimum flow rate. The schedule would be a fraction of the
> > maximum flow rate (and minimum since these would be the same). You
> would
> > have to create this schedule based on the desired flow rate in a
> > spreadsheet and save it as a comma separated file. You would
> specify the
> > file name in the Schedule:File object.
> >
> > yunpeng.hu wrote:
> > >
> > > Hi, Lee.
> > > I have no idea about how to use external file to feed E+ hourly
> data
> > > once at the beginning of the simulation.
> > > Would you mind show me more detail?
> > > Thank you very much!
> > >
> > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > <mailto:EnergyPlus_Support%40yahoogroups.com>, "Edwin Lee"
> > > <leeed2001@> wrote:
> > > >
> > > > I'm pretty sure EnergyPlus won't interact with software like
> Matlab
> > > during a
> > > > simulation, however, if you know the schedule for outdoor air at
> > > different
> > > > time steps (hours), you can use an external file to feed E+
> hourly
> > > data once
> > > > at the beginning of the simulation.
> > > > Edwin
> > > >
> > > > On Sun, Jan 18, 2009 at 4:10 PM, yunpeng.hu <yunpeng.hu@> wrote:
> > > >
> > > > > Why do I want EnergyPlus to INTERACT with MATLAB, FORTRAN or
> > > others
> > > > > program language?
> > > > > I just want to change the flow rate by myself, becasue I need
> the
> > > > > flow rate to change in certain timesteps. I want to know how
> the
> > > > > temperature changes in a given air flow rate in a VAV system,
> but
> > > the
> > > > > Energyplus always, in my opinion, give the trend of air flow
> rate
> > > to
> > > > > meet the zone setpoint.
> > > > > Maybe what I say has some misunderstanding, please point out!
> > > > > I will try my best to make it clear.
> > > > > Thanks a lot!
> > > > >
> > > > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > <mailto:EnergyPlus_Support%40yahoogroups.com><EnergyPlus_Support%
> > > 40yahoogroups.com>,
> > > > > D T <ellinas.1984@>
> > > > > wrote:
> > > > >
> > > > > >
> > > > > > To address your last question, whether EnergyPlus interacts
> with
> > > > > any software, I know that there are software programs you can
> use
> > > to
> > > > > draw up a building and define building geometry and
> dimensions.
> > > You
> > > > > can then export these files to EnergyPlus. From personal
> > > experience,
> > > > > I know that you can specifically use DesignBuilder (a graphic
> user
> > > > > interface software package compatible w/ EnergyPlus) to draw
> the
> > > > > facility and define the loads for your building and then
> export
> > > the
> > > > > idf file to EnergyPlus. I know that there is also a plugin
> program
> > > > > that lets you define building geometry as well (but I don't
> know
> > > too
> > > > > much about it). But, to my knowledge, I do not think that
> > > EnergyPlus
> > > > > is capable of interacting with programs such as MATLAB as you
> > > > > mention. Honestly, I do not understand why you would need
> > > EnergyPlus
> > > > > to interact with MATLAB.
> > > > > > ?> -Dimos Triantafillu
> > > > > >
> > > > > >
> > > > > > --- On Sat, 1/17/09, yunpeng.hu <yunpeng.hu@> wrote:
> > > > > >
> > > > > > From: yunpeng.hu <yunpeng.hu@>
> > > > > > Subject: [EnergyPlus_Support] how to change the outdoor air
> flow
> > > > > rate?
> > > > > > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > <mailto:EnergyPlus_Support%40yahoogroups.com><EnergyPlus_Support%
> > > 40yahoogroups.com>
> > > > > > Date: Saturday, January 17, 2009, 10:50 PM
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > Hi,all.
> > > > > > I've defined the "Outdoor Air method" as the "sum" in the
> > > > > sizing:zone,
> > > > > > and set the "100% Outdoor Air in Cooling" as "yes". What's
> more
> > > > > > the "Minimum / Maximum fraction of Outdoor Air Schedule" is
> all
> > > the
> > > > > > same£¬¡°1¡±¡£
> > > > > > But the outdoor air flow rate can't change with the Occupy
> > > > > Schedule.
> > > > > > I've given the "Outdoor Air Flow Per Person", of course, in
> > > > > > the "Sizing:Zone" .
> > > > > > Why the outdoor air flow rate can not change with the Occupy
> > > > > Schedule?
> > > > > >
> > > > > > By the way, does EPlus interact with other softwrae, just
> like
> > > > > Matlab
> > > > > > or others?
> > > > > >
> > > > > > Thanks!
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > >
> > >
> >
> > --
> > 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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