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RE: [EnergyPlus_Support] Re: Actual Air flow ?
I would like to clarify what Lisa said in the last paragraph.
All incoming airflows are a part of zone loads, including infiltration,
ventilation and mixing. All outgoing airflows are not a part of zone loads.
Lixing
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of lisacng
Sent: Tuesday, July 03, 2012 9:36 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Actual Air flow ?
Alberto, Oscar
Just to make things clear, "inside" and "outside" aren't inside the building
and outside the building. It is the inside or outside face of the referenced
surface (AirflowNetwork:MultiZone:Surface // Surface name // Leakage
component name) where your leakage element is.
Also, in the same hour, you are seeing two different values for 1-->2 and
2-->1 in the same window because your time step is smaller than an hour. If
you output detailed or timestep results, you will see that only one flow
should have a value and the other is zero. The hourly output is an average
of the timestep outputs. If using the hourly results is fine, then the flow
of air is the difference of 1-->2 and 2-->1 and the direction is determined
by which is greater.
It should be noted that EnergyPlus only uses the flow into a building from
the outdoors to affect the load on a zone. Exfiltration (air leaving a
building) and mixing of air between zones does not affect load calculations.
Someone out there can correct me if I'm wrong.
Lisa Ng
NIST
IAQ & Ventilation Group
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, oscar hernandez
<oscarhernandez_81@...> wrote:
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> Don't worry.
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> If I remember, 1 to 2 is from outside to inside and 2 to 1 inside to
outside. Look at the energyplus input output manual (airflow network) you
have everything about that.
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> Let me know if you need more help.
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> Oscar.
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: ahneto@...
> Date: Sat, 30 Jun 2012 17:44:40 -0300
> Subject: RE: [EnergyPlus_Support] Actual Air flow ?
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> Dear Oscar,
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> Sorry to bother you again but , regarding the air flow network, how do
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> I know the direction (from inside to outside and vice versa) of the
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> Thanks for your help.
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> Alberto
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> Citando oscar hernandez <oscarhernandez_81@...>:
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> > THe value 1 to 2 or 2 to 1 is the flow rate. You have to inside or
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> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
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> > From: ahneto@...
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> > Date: Fri, 29 Jun 2012 13:54:19 -0300
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> > Subject: [EnergyPlus_Support] Actual Air flow ?
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> > Dear Forum,
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> > I modeling a room with the AirFlowNetwork object. I would like to
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> > When I set as output variable AirflowNetwork Mass Flow Rate from Node
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> > 1 to 2 and AirflowNetwork Mass Flow Rate from Node 2 to 1 for a
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> > the actual flow rate and the direction will be set verifiying which
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> > Regards,
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> > Alberto Hernandez Neto
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