RE: [EnergyPlus_Support] Modulation of openings in Airflow Network

[Lixing Gu <gu@xxxxxxxxxxxx>]

Omar:

The zone temperatures used to check window or door openings are the values at the previous time step. You may use report frequency ?Detailed? to see what happens. The zone temperatures at the current time step are calculated based on window openings, if the temperature difference between the zone temperature at the previous time step and Tset determines to open a window.

Hope this helps.

Lixing Gu





From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of omarvelling
Sent: Friday, April 15, 2011 4:16 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Modulation of openings in Airflow Network







Hi all,

I'm trying to modulate, or to be precise, cancel the modulation of the opening size of an AirflowNetwork:Multizone:Surface object so that it can either be fully open (i.e. Multiplier equals 1.0) or closed i.e. (Multiplier equals 0.0) depending on the ventilation control mode. I have managed to achieve this when the ventilation control mode is set to 'Constant' by specifying a venting availabilty schedule. However, when using 'Temperature' as the ventilation control mode and by setting the Ventilation control zone temperature setpoint at 22 C I found that the output for the 'Window/Door opening factor' is greater than 0.0 even when the zone temperature is below 22 C, that is when Tzone < Tset indicating that the window is partially open. As shown below, I've tried to overcome this by setting the minimum venting opening factor field in the AirflowNetwork:Multizone:Zone object to 1.0. I've also set the two sets of Opening factor Data in the AirflowNetwork:Multi

Can anyone tell me why this is happening?

Thanks in advance,

Omar
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