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[EnergyPlus_Support] Re: how to change the outdoor air flow rate?
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, 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>, "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><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><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
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
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