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Re: [EnergyPlus_Support] Air Flow between Zones
Airflownetwork has limitations which prevent it from being used for this
application. This can be modeled as follows:
1. In the central zone, add a ZONE EXHAUST FAN with a flow rate equal to the
amount of air which passes to the adjacent zones. This will balance the
airflows for the central zone (return = supply - exhaust). Why put the exhaust
(extractioni fan) in the central zone? Because the air loop simulation needs
to know that some quantity of air is leaving the central zone through a path
that is not the return duct. It does not matter if the air leaves through an
exhaust fan, a door to and adjacent zone, or whatever.
2. Use MIXING objects to move air from the central zone to the adjacent zones.
So, you may ask, why no exhaust fan in the adjacent zones? When MIXING adds
air to a zone, it assumes that an equal amount of air has left the zone. It
does not matter where the air went. So, the "extraction" of air from the
adjacent zones is already modeled. The extractino fan power can be accounted
for in the central zone exhaust fan.
Note that the air loop simulation is not aware of the MIXING objects in terms
of balancing airflow. It is the user's responsbility to make sure that the
flow rates are balanced.
Mike
On 17 Jan 2008 at 13:53, Filipe madureira wrote:
> Hi all,
>
>
>
> I working in a commercial building which has the following characteristics:
>
>
>
> 1. A central zone rounded by several adjacent zones
>
> 2. The adjacent zones communicate with central zone through doors.
>
> 3. A central system (CV or VAV, it isn? t defined yet) provides
> treated fresh (outside) air to central zone. The air flow rate accounts
> with the necessary fresh air to central and adjacent zones
>
> 4. It is planned that adjacent zones have negative pressure in a way that
> the compensating air flow rate come from central zone through the door (an
> extraction fan will exhaust an air flow rate equal to the fresh air needed in
> the zone ). Adjacent zones will also have a zone forced air unit to provide the
> necessary local heating or cooling.
>
>
>
> Is it possible to simulate this situation? I?m not sure if I can do this
> with Airflow NetWork .
>
>
>
> One of my issues is that in the central air loop:
>
> Return air flow rate + Zone exhaust Flow rate= Supply air flow rate
>
>
>
> so I don? t know if air loop could take in account the air flow rate that
> passes to adjacent zones
>
>
>
> Thanks in advance for your help
>
> Best Regards
>
>
>
> Filipe Madureira
>
> Tel: +351 919 293 876 | E-mail: filipe.madureira@xxxxxxxxxxxxx
>
> __________________________________________________________________
>
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>
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>
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>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
> The primary EnergyPlus web site is found at:
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>
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>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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