Re: [EnergyPlus_Support] Stack Ventilation - Airflow Network

[Santosh Philip <santosh_philip@xxxxxxxxx>]

Yes Jean, the windows are constantly open.�
I am working my way through the engineering manual. It is pretty heavy going.�
I think my client is going to ask me why the ventilation is changing during the day. I want to be able to show him what is going on thru the E+ outputs.
Santosh.�

Sent from my iPad
On May 7, 2014, at 8:48 PM, "<mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx" <<mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx> wrote:

> Are your windows constantly open?
> 
> Mit freundlichen Grüßen- Sent from my iPhone�(excuse the brevity)
> i. A.
Jean Marais
b.i.g. bechtold
Tel. � +49 30 6706662-23
> On 07.05.2014, at 22:33, <<mailto:santosh_philip@xxxxxxxxx>santosh_philip@xxxxxxxxx> wrote:
> 
>> �
>> 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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