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[EnergyPlus_Support] Re: airflow network influenced by zone controls? ventilation setpoint does not work
Thanks a lot for the quick help! my simulation timestep is indeed
hourly, and timesteps per hour are 4.
And I will have a look at the hybrid ventilation as well.
regards,
Astrid
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@...> wrote:
>
> Astrid:
>
> The answer to the first question (Tzone< 22C and windows are open)
is that
> the report frequency may be hourly, instead of "detailed". The
> AirflowNetwork model works at every system time step, which is equal
or less
> than the zone time step given in the input file. When the report
frequency
> is greater than the system time step, the average airflows are
reported. It
> is possible that the zone temperature may be higher than 22C in a
system
> time step during the report frequency, so that you may see airflows
or other
> report variable values are not zero due to average.
>
> The answer to the second question is that you may try to use the
> AvaiabilityManager:HybridVentilation object. One of purposes for
this object
> is to prevent simultaneous natural ventilation and HVAC system
operation.
> The detailed descriptions are given in both Input Output Reference and
> Engineering Reference. An example input file, called
> HybridVentilationControl.idf, may give a guide how to use this object.
>
> Please let me know if you need more information.
>
> Thanks.
>
> Lixing
> ----- Original Message -----
> From: <astroid8@...>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Sent: Tuesday, March 03, 2009 10:52 AM
> Subject: [EnergyPlus_Support] airflow network influenced by zone
controls?
> ventilation setpoint does not work
>
>
> Dear all,
>
> I got stuck with two questions regarding the airflow network system:
>
> I am modelling an airflow network system for natural ventilation,
> using the ventilation control mode "temperature". my setpoint
> temperature above which the windows should be modelled open is 22°C.
> However if I look at the output (zone/sys air temperature) I can also
> find hours with opened windows even if the zone temperature is
> slightly below 22... What is my mistake?
>
> Additionally I want to calculate the cooling loads to a certain
> setpoint, so I use dual setpoint with deadband at zone control
> thermostatic. How is it possible to switch off the natural ventilation
> (i.e. assume closed windows) defined in airflow network system while
> the cooling system is running?
>
> I would be happy about some help,
>
> Regards, Astrid
>
>
>
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