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RE: [EnergyPlus_Support] Supply and return airflow rates do not match in AFN
Solomon,
The timestep is xx / hour, so a value of 1 = 1 / hour. I think you want a bigger number 12? 30?
James V Dirkes II, PE, BEMP, LEED AP
<http://www.buildingperformanceteam.com/>www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Solomon Yin
Sent: Monday, May 05, 2014 1:35 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Supply and return airflow rates do not match in AFN
Jean
I just tried with timestep=1, still not working.�
It seems like something wrong with the objects in AirflowNetwork:Distribution. When I run the simulation without modelling AFN:distribution, it gave me reasonable results on infiltration.
Solomon
To: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx
From: <mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx
Date: Mon, 5 May 2014 19:15:02 +0200
Subject: Re: [EnergyPlus_Support] Supply and return airflow rates do not match in AFN
Did you try to reduce the timestep?
2014-05-05 1:00 GMT+02:00 <<mailto:solomonyp@xxxxxxxxxxx>solomonyp@xxxxxxxxxxx>:
Dear E+ users:
I am trying to simulate the energy loss through an air distribution system by using the Airflow Network in E+. My building is a single story, rectangle residential house with unconditioned attic where ducts are located. The space heating and cooling are provided by a central warm-air furnace with gas heating and electric cooling. The severe error resulting from running AFN model is listed as�
�** Severe �** AirflowNetwork: The airflow direction is opposite to the intended direction (from node 1 to node 2) in AirflowNetwork:Distribution:Linkage = SUPPLY DUCT LINK 1
� �** � ~~~ � ** �During Warmup, Environment=COOLING DESIGN DAY, at Simulation time=07/21 00:00 - 00:15
� �** � ~~~ � ** The sum of the airflows entering the zone is greater than the airflows leaving the zone (e.g., wind and stack effect).
� �** � ~~~ � ** Please check wind speed or reduce values of "Window/Door Opening Factor, or Crack Factor" defined in AirflowNetwork:MultiZone:Surface objects.
However, the MultiZone Airflow works fine when AFN Control was set as MultizoneWithoutDistribution.
I tried to fix this severe error by adjusting the Wind Speed, Crack Factor, Airflow Convergence Tolerance, Air Mass Flow Coefficient, and Maximum Iterations, but none of them works.�
Dose anyone have a clue on how to fix this issue?
Thanks
Solomon
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