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Re: [EnergyPlus_Support] Stack Ventilation - Air flow Network
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: Re: [EnergyPlus_Support] Stack Ventilation - Air flow Network
- From: "Geert Bellens" <geert.bellens@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 08 May 2014 07:30:54 +0200
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- Delivery-date: Wed, 07 May 2014 23:31:06 -0600
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Stack ventilation depends also on the temperature difference Inside-outside.
Best regards,
Geert Bellens
----- Reply message -----
Van: santosh_philip@xxxxxxxxx
Aan: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Onderwerp: [EnergyPlus_Support] Stack Ventilation - Airflow Network
Datum: wo, mei 7, 2014 22:33
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 u nderstand 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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