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[EnergyPlus_Support] Re: Mechanical ventilation and earth tube

Hello everybody,

I was wondering if Serge or anyone else has found the best solution for this problem. Is it a good idea to use this extra zone or is it better to pre-run the model with only the earth tube and afterwards run again with the output from the pre-run like someone else said?

I am worried that this extra zone could affect the temperature of the earth tube air before it enters other zones..

Thanks a lot!

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "serge.gosset" <e-sim@...> wrote:
>
> Mhhhh,
> 
> That's what I am afraid of ...
> I'll check the equations and investigate the intermediate zone idea a
> bit further unless someone has a better one !
> 
> Thanks again
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Edwin Lee <leeed2001@>
> wrote:
> >
> > I am not an expert on the earth tubes, but as best I know, the earth
> tube is currently modeled as just zone equipment, so when the air heat
> balance is performed on the zone, any addition from the earth tube is
> simply another term in the heat balance.  The earth tube model does
> allow you to add a fan to the earth tube so that you can account for
> power used by a mechanical device, but I don't think an earth tube can
> be embedded into the hvac system any further than this.  Your idea for
> the small zone is interesting, and may be the best work-around.
> > 
> > Edwin Lee
> > 
> > ----- Original Message ----
> > From: serge.gosset <e-sim@>
> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > Sent: Saturday, February 2, 2008 12:47:40 PM
> > Subject: [EnergyPlus_Support] Mechanical ventilation and earth tube
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> >   
> > 
> > 
> >     
> >             Hello everybody,
> > 
> > 
> > 
> > I am modelling passive buildings in E+.
> > 
> > 
> > 
> > Such buildings have a mechanical ventilation with economizer and heat
> > 
> > exchangers between the fresh air and exhaust fluxes.
> > 
> > 
> > 
> > The fresh air comes alternatively from either the outside either an
> > 
> > groud air exchanger (earthTube) according to the available
> > 
> > temperatures and the control strategy (heating or cooling).
> > 
> > 
> > 
> > The problem with E+ is that the outlet of the eathTube is always a
> > 
> > zone and the inlet of the mechanical ventilation the outside air.
> > 
> > 
> > 
> > Did someone try to model this ?  How ?
> > 
> > 
> > 
> > If not, is it possible to plug the mechanical ventilation fresh air
> > 
> > inlet into a zone connected to the earth tube ?  We could put a well
> > 
> > insulated small zone in the building for that specific purpose.
> > 
> > 
> > 
> > Thank you very much for your feedback.  I'll keep researching a
> > 
> > solution in the meantime.
> > 
> > 
> > 
> > Best regards,
> > 
> > 
> > 
> > Serge
> > 
> > 
> > 
> > 
> > 
> >     
> >   
> > 
> >     
> >     
> > 
> > 
> > 
> > 
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