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[EnergyPlus_Support] Re: Earth tube connected to VAV system with supplies and returns in different zones

Hi Kwang,

I'm trying to access the features of the Earth tube model in compact hvac. The earth tube model appears to be quite simple in terms of ventilation. However, what happens when it is connected to a more complex system? 

That is what I'm attempting. 

The other point relates to interzonal air flow induced by compact HVAC. My current approach is: use an appropriate hvac template, run E+, open the expidf and apply set point managers to set mass flow to zero on the appropriate nodes shutting off supply/ extract in the respective rooms. In this way, I hope to model supply in one room with extract in another. I think I need to do a couple of things in AirflowNetwork that I haven't worked out yet.

Chris



--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Kwang Ho Lee" <kwhlee@...> wrote:
>
>  Dear Chris,
> 
>  I don't fully understand what you want to do.
>  You want to substitute the VAV system for Earth Tube or you want to
> connect those two?
> 
>  Earth Tube model in EPlus acts almost the same as the ZoneInfiltration or
> ZoneVentilation model. It gets the outside air and introduces to the
> room. However, the difference between earth tube model and the other two
> is that the air is heated or cooled by the surrounding soil before
> entering the room. You don't need to specify the nodes typically required
> in HVAC modeling in EPlus.
> 
>  Can you please spell out more of what you want to model?
> 
>  Regards,
> 
>  Kwang
> 
> 
> > Hi
> >
> > I'm just writing in to see if the above system can be modelled in
> > principle before I delve in to the reams of E+ documentation - heaven help
> > me! It would also help me work out if I can tell my client "yes" or "no it
> > can't be done!".
> >
> > First, could I substitute the VAV system Outdoor air node for the zone
> > used by the ZoneEarthTube?
> >
> > Second, utilising the relevant AirflowNetwork objects, could I edit the
> > return air nodes/ return mixer to alow for Air to be supplied in one (or
> > more) rooms and extracted from one (or more) alternate rooms.
> >
> > Many thanks
> >
> > Chris
> >
> >
>




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