[EnergyPlus_Support] Stack Ventilation - Airflow Network

[<santosh_philip@xxxxxxxxx>]

I am doing some experiments to see how stack flow ventilation works in Energyplus using Airflow Network. I am primarily interested in Stack ventilation and not in cross-ventilation.



I made a simple box 20' X 30' X 25'(height)

with 2 windows on the 20' elevation, on either side of the box

one window is high and the other window is low



To ensure that I get only stack ventilation, I modified the weather file so that windspeed is 0 m/s at all times.



I looked at output variables

- AFN Linkage Node 1 to Node 2 Volume flow rate (for both windows) - m3/s

- AFN Linkage Node 2 to Node 1 Volume flow rate (for both windows) - m3/s

- AFN Zone infiltration Air Change rate (ach)



These numbers are internally consistent - the volume flow matches the ach.



The ACH varies quite quite a bit through the year going from 0 ACH to 20 ACH

I am trying to understand what makes the ACH change.

What should I be looking at get a sense of this ?



Any advice or pointers ?



Thanx





Santosh Philip








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