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[EnergyPlus_Support] Re: Multiple Zones for Single Heat Pump
The system actually uses heat pumps with variable volume fans to serve multiple zones. However, e plus only allows for on/off fans in the HP objects I'm using. I discovered that throwing vav boxes on the supply inlets to rooms allows the fan speed to modulate. Nifty work around.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Karen Walkerman <kwalkerman@...> wrote:
>
> Any reason you're not using ZoneHVAC:WaterToAirHeatPump? Put one in each
> zone...
>
> Also, how does the building operate in reality? Does it really have heat
> pumps serving VAV boxes?
>
> --
> Karen
>
> On Mon, Jan 23, 2012 at 4:20 PM, luke_dorna <luke.dorna@...> wrote:
>
> > **
> >
> >
> > I'm doing exactly that, using a single heat pump and distributing the
> > capacity.
> >
> > I was hoping there was a work around that would allow me to treat these as
> > per a standard AHU with VAV outlets, but it doesn't appear that Energy+ is
> > going to cooperate.
> >
> > Thanks,
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jim Dirkes" <jim@> wrote:
> > >
> > > Dear Luke,
> > >
> > > Thinking about this, it is common for a WSHP to serve more than one room,
> > > but uncommon for there to be more than one thermostat (i.e. multi-zone).
> > > These devices are pretty much a one zone component.
> > >
> > > That said, you can only do what the software allows or for which there
> > is a
> > > reasonable work-around. When you think of it, a reasonably designed
> > system
> > > will normally include zones with similar occupancy, schedule, set points,
> > > etc. If that's true, just assign one heat pump per zone, using the same
> > COP,
> > > fan performance, etc. as for a larger multi-zone heat pump. If it's not
> > > true, one WSHP per zone is still the best available solution, since E+
> > does
> > > not have a multi-zone WSHP object (as you already note).
> > >
> > >
> > >
> > > The Building Performance Team
> > > James V. Dirkes II, P.E., BEMP , LEED AP
> > > 1631 Acacia Drive NW
> > > Grand Rapids, MI 49504
> > > 616 450 8653
> > >
> > >
> > >
> > > From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > > [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of luke_dorna
> > > Sent: Monday, January 23, 2012 3:05 PM
> > > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > > Subject: [EnergyPlus_Support] Multiple Zones for Single Heat Pump
> > >
> > >
> > >
> > >
> > >
> > > I am currently using the the AirLoopHVAC:UnitaryHeatPump:WaterToAir
> > object
> > > to model distributed heat pumps throughout a building. Unfortunately, the
> > > object only allows for a single controlling thermostat, but the design
> > calls
> > > for heat pumps that serve multiple rooms.
> > >
> > > Has anyone encountered/found a way around this?
> > >
> > > I've tried attaching reheat VAVs to the different zones but didn't have
> > much
> > > luck.
> > >
> > > Thanks,
> > >
> > > Luke
> > >
> >
> >
> >
>
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