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[EnergyPlus_Support] Re: Energyplus IDF for hybid ground source heat pump



Thank you for your kind help!

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Karen Walkerman <kwalkerman@...> wrote:
>
> Hello,
> 
> I have modeled a system in EnergyPlus where you couple a boiler and cooling
> tower to a plant loop.  The attached file shows the setup.  I believe you
> could do something similar with a GLHX, just replace the boiler with the
> GLHX, and change your operation schemes to allow the ground loop to do
> cooling as well.
> 
> One note of caution: the attached file uses a
> HeatExchanger:WatersideEconomizer to link the PlantLoop and CondenserLoop.
>  I have found this object to be problematic in the current version of
> EnergyPlus, as it does not transfer all energy to the CondenserLoop.  In
> other production projects I am using instead a water-cooled chiller with a
> very high COP in order to link the two loops.
> 
> Hope this helps,
> 
> --
> Karen
> 
> On Wed, Aug 3, 2011 at 11:35 PM, Xing <xing.shi.2006@...> wrote:
> 
> >
> >
> > The system is located near Nanjing, China. Usually, the GSHP in this area
> > cannot achieve heating and cooling balance. If we design GSHE based on the
> > larger cooling load in summer, it will result in excessive GSHE in winter,
> > meaning large initial cost (more bore holes, longer pipes, etc.).
> >
> > A common way is to combine a second loop into the system, using a cooling
> > tower to provide needed cooling capacity in summer. The warm water coming
> > out of condenser is split into the GSHE and the cooling tower. This is the
> > basic idea.
> >
> > We just don't know how to model this in EnergyPlus.
> >
> > Thank you!
> >
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@> wrote:
> > >
> > >
> > > I cannot visualize what you are doing. GSHP uses a GS Heat exchanger to
> > cool the condenser coil of the HP. The tower method is the usual way to cool
> > a chiller, which can be a HP.. If you wanted to run the tower and the GSHE
> > at the same time, there must be a reason. If the GS heat exchanger does not
> > have enough capacity, you wanted to connect the GSHE cooling water to the
> > towerl. Is that the problem? GSHE is a closed loop water system. Cooling
> > tower method let the condenser coil evaporate some water with a fan or
> > funnel to carry away the water vapour. How is your hybrid system designed?
> > Dr. Li
> > > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> > > From: xing.shi.2006@
> >
> > > Date: Wed, 3 Aug 2011 07:35:12 +0000
> > > Subject: [EnergyPlus_Support] Energyplus IDF for hybid ground source heat
> > pump
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > I am working on using EnergyPlus to simulate a hybrid ground source heat
> > pump (with a cooling tower). We ran into some difficulties. Just wondering
> > where we can find an example IDF we can learn from. EnergyPlus official
> > website offers a web-based example IDF generator but we couldn't find hybrid
> > ground source heat pump there.
> > >
> > >
> > >
> > > Thanks!
> > >
> >
> >  
> >
>




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