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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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