Re: [EnergyPlus_Support] Re: airflow network influenced by zone controls? ventilation setpoint does not work

[Lixing Gu <gu@xxxxxxxxxxxx>]

Astrid:

The hybrid ventilation control is based on HVAC Air Loop. You need to define 
a detailed cooling system. You may use HVACTemplate to generate a detailed 
cooling system.

Lixing

----- Original Message ----- 
From: <astroid8@xxxxxxxxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Tuesday, March 03, 2009 12:32 PM
Subject: [EnergyPlus_Support] Re: airflow network influenced by zone 
controls? ventilation setpoint does not work


Dear Lixing,

Do I have to define a detailed cooling system in order to use this
hybrid ventilation function? I am using purchased air, becauuse I am
just interested in the cooling loads and not the cooling system...

Astrid

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "astroid8@..."
<astroid8@...> wrote:
>
> 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
> >
> >
> >
> > ------------------------------------
> >
> > The primary EnergyPlus web site is found at:
> > http://www.energyplus.gov
> >
> > The group web site is:
> > http://groups.yahoo.com/group/EnergyPlus_Support/
> >
> > Attachments are not allowed -- please post any files to the
appropriate
> > folder in the Files area of the Support Web Site.
> >
> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf
> under the
> > Documentation link and press the "search" button.
> > Yahoo! Groups Links
> >
>




------------------------------------

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Attachments are not allowed -- please post any files to the appropriate 
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