Generally, buildings don’t exist without connectivity to outdoors.
When using AFN, as Lixing states, every zone/node must connect to a node of known pressure (typically the outdoors) via a variable flow (i.e., non forced) link/opening.
If you’d like to know more about this, see the following:
Lorenzetti, D.M. 2002.
Computational Aspects of Nodal Multizone Airflow Systems. Building and Environment,
37(11): p. 1083-1090.
Dols, W.S. and B.J. Polidoro. 2015.
CONTAM User Guide and Program Documentation, NIST Technical Note 1887. National Institute of Standards and Technology: Gaithersburg, MD.
The section titled Theoretical Background � Airflow Analysis / Fanns � Constant Flow Fans
- Stuart
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Monday, December 07, 2015 9:51 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Modelling interzone air exchange with AirflowNetwork
No. The model requires external nodes as boundary conditions.
Hope this helps.
Lixing
From:
EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Friday, December 04, 2015 3:04 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Modelling interzone air exchange with AirflowNetwork
Hi
I'm trying to model the interzone airflow with AFN
I used AfrflowNetwork:MultiZone:Component:SimpleOpening with one door object(FenestrationSurface:Detailed), and very simple geometry(only 2 zones in model).
However, when I run the E+ simulation, there is fatal error :
** Severe ** GetAirflowNetworkInput: No External Nodes found in AirflowNetwork:Multizone:ExternalNode. There must be at least 1 external node defined.
I can solve this error by just adding simple crack on roof surface with external AFN nodes definition, but in this way, there is unwanted infiltration AFN node air flow rate occurs.
I just want to model the air flow networks through internal openings(door, window, ...) only.
Any suggestion?
.
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Posted by: "Dols, William Stuart" <william.dols@xxxxxxxx>
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