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[EnergyPlus_Support] Re: "AFN Wind Pressure Coefficient Typ" = "Input" does't work



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--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "tobiasschulzeoooitu" <tobias.schulze@...> wrote:
>
> Hello,
> 
> I have difficulties with the Airflow Network in E+ v7.2. May be there is a bug.
> 
> The AFN doesn't consider my defined external node height.
> 
> In the "AirflowNetwork:MultiZone:ExternalNode" object all nodes set at 10m and Cp values and the arrays are defined.
> In the "AirflowNetwork:SimulationControl" oject "Wind pressure Coefficient Type" set to "Input".
> 
> Doesn't matter what I do the "AFN wind pressure"s calculated are always based on local height wind speed calculations (the ASHRAE power law) - not on the node height defined.
> 
> Design day wind speed 3 m/s
> building terrain = country
> AFN all nodes height = 10m
> 
> therfore all calculated wind pressures should be based on 3 m/s
> if the Cp's are equal, same wind pressure independent on height of the external opening
> 
> But outputs show they are dependend on height.
> 
> Can you please check that issue?
> Thank you and regards
>




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