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[EnergyPlus_Support] Re: ATUs - Insufflated vs. Exhaust Air flows
Thanks a lot for all your answers.
Regarding option 4:
- If I use Cross-mixing instead, doesn't the program account for the
corresponding outgoing flow in the source zone?
Thanks again,
Ana Rui.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
<mjwitte@...> wrote:
>
> 1. First, I will clarify some terminology:
> Return air flow - air leaving the zone and returning to the HVAC
system
>
> Exhaust air flow - air leaving the zone and exhausted to outdoors
>
> Return air flow rate is computed as Supply air flow minus Exhast
air flow
>
> I am not sure when you say "exhaust" if you mean return or exahust
as defined
> above. I will use my definitions below.
>
> 2. The systems created by Compact HVAC assume that return air flow
is equal to
> supply air flow.
>
> 3. If you want to add exhaust air flow, you can add ZONE EXHAUST
FAN objects by
> editing the expidf file.
>
> 4. If you want to model a constant (or scheduled) flow from one
zone to
> another, you can use a MIXING object to move air from one zone to
another.
> However, the HVAC system has no knowledge of this and the user must
balance the
> airflows by adding a dummy ZONE EXHAUST FAN to the source zone to
cause a
> reduction in return air flow from the source zone.
>
> 5. For constant volume systems, you can use
AIRFLOWNETWORK:DISTRIBUTION:*
> objects to model the pressure-indcued flows, but this feature does
not yet
> support VAV systems.
>
> Mike
>
>
> On 9 Jan 2008 at 16:23, anarui.oliveira wrote:
>
> > Hi.
> >
> > The parameters for ATU, such as those cretated by
> > - Compact HVAC:Zone:VAV,
> > - Compact HVAC:System:VAV,
> > only allow the user to define the insufflated air flows (Supply
air
> > flow), right?
> >
> > What does the simulation assume, in this case, for the exhaust
air
> > flows, and how does it deal with the corresponding effect on the
> > inside pressures?
> >
> > If the case to model has different insufflated and exhaust flows,
how
> > does it affect my model? Wow can I implement this in E+?
> >
> > And if a certain zone only has forced exhaust flow, and the inlet
> > flow is assumed to be drawn from adjacent areas by pressure
> > difference?
> >
> > Thanks in advanced.
> >
> > Best regards,
> > Ana Rui.
> >
> >
> >
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> >
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> >
> > Attachments are not allowed -- please post any files to the
appropriate folder
> > in the Files area of the Support Web Site.
> >
> > EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf
under the
> > Documentation link and press the "search" button.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@...
>
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