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[EnergyPlus_Support] Re: Multiple HVAC systems serving one zone

Thanks Jeannie, had actually never seen the EMS objects!  Will look into it.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jean Marais <jeannieboef@...> wrote:
>
> I believe the fan:zoneexhaust object is a sort of zone equipment, i.e. not
> connected to the airloop per say. But e+ will warn you that the supply and
> exhaust of the AHU does not balance. But x2 airloops per zone is currently
> not possible (unless you're an advanced user and start looking into the
> userdefined ventilation objects and how they can do amazing things linked
> with ems as hinted at by Brent). Actually, you should use the
> fan:zoneexhaust object and write a small ems to override the on schedule of
> the fan by monitoring the ODA conditions. ems is not a black art...it is
> just a scary name. a small piece is usually quite easy.
> 
> On 26 November 2012 21:34, thevinyldropper <thevinyldropper@...>wrote:
> 
> > **
> >
> >
> > I am having some difficulty setting up multiple HVAC systems serving one
> > zone. The situation is that I am modeling a building with packaged rooftop
> > units as well as exhaust fans. However, I can't model the exhaust fans
> > using the exhaust fan object because the exhaust fans are controlled based
> > on enthalpy differential with outdoor air (as I understand it, exhaust fan
> > availability managers only allow temperature differential).
> >
> > So I thought I would set up another HVAC system in addition to the RTUs
> > that would function like the exhaust fans (with a supply fan, rather than
> > exhaust, no heating or cooling coils). I could then use an outside air
> > controller to specify the enthapy differential control. The issue I am
> > having is setting up both systems to serve one zone. Do I connect the
> > second system (exhaust system)to the zone inlet node, or upstream of the
> > zone splitter associated with the RTUs? Where do I connect downstream of
> > the zone?
> >
> > Any help would be much appreciated. Of course, if anyone has a way of
> > getting the exhaust fan object to run on differential enthalpy, I would
> > take suggestions there too!!
> >
> > Andrew
> >
> >  
> >
>




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