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

Dear Lixing, thanks a lot again. I was hoping there is a possibility
without defining a detailed cooling system, but I will check this.

Astrid

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@...> wrote:
>
> 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@...>
> 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
> > >
> >
> 
> 
> 
> 
> ------------------------------------
> 
> 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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