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

[Lixing Gu <gu@xxxxxxxxxxxx>]

The answer is correct. 

Lixing Gu

-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of china4ever2003
Sent: Monday, March 07, 2011 7:51 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [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.
> >
> > 
> >
>




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

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to
energyplus-support@xxxxxxxx

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 currently allowed but be mindful that not everyone has a
high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
Documentation link and press the "search" button.
Yahoo! Groups Links







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

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/