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[EnergyPlus_Support] Re: Iteration principle between COMIS and E+

I have posed this question before, and got the response "We would say AFN uses lagged conditions for zone air in the predict step." That to me sounds like ping-pong coupled. But this document http://simulationresearch.lbl.gov/dirpubs2/BS07/eplus_398.pdf seems to speak otherwise and imply onion coupling. 

What do you think?

 

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Drury B Crawley <dbcrawley@...> wrote:
>
> EnergyPlus and Airnet (air flow network) are integrated.  COMIS was removed
> from EnergyPlus many years ago.
> 
> Suggest you read the discussion on the AirFlowNetwork Model in the
> EnergyPlus Engineering Documentation (starts on page 433 (or page 458 of the
> PDF).
> 
> All EnergyPlus documentation is searchable.
> 
> 
> 
> On Sun, Mar 6, 2011 at 8:53 PM, Wonjun <lesthesia@...> wrote:
> 
> >
> >
> > Hello
> > I wonder about the "Iteration principle" between COMIS(Integrated to
> > E+:Airflow network) and E+
> > I wonder whether this ping-pong or onion method.
> > Maybe you know what ping-pong and onion but I'll explain regarding this
> > briefly.
> >
> > Ping- pong iteration
> > (1) In time step "t" Comis calculate the airflow rate and then this
> > information is transferred to E+ heat balance model.
> > (2) In time step "t+1" E+ calculate the zone temperature based on the
> > airflow rate information from COMIS and then temp. information is
> > transferred to COMIS to calcaulte airflow rate.
> >
> > Onion iteration
> > (1) In the timestep "t" E+ and Comis transfer temp and airflow rate
> > information each other and update them until the residual is below the
> > converge criteria
> > (2) If the criteria is satisfied, E+ and Comis starting the calculation of
> > next time step "t+1"
> >
> > I don't know what iteration method E+ adopted.
> >
> > 
> >
>




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