I'm trying to achieve similar but with a Water to air Heat pump. I'm attempting to simulate the use of an aquifer for seasonal storage. I am using District heating and District Cooling on a condenser supply branch coupled to zone;hvac:watertoairheatpump with equationfits for the cooling and heating coil. I don't need to ground couple the heat pump as I have separate software for groundwater modelling, I'm only after flow rates and temperatures.
The simulation runs and the flow rates that return seem reasonable, temperature differences are in the right direction however I can't control the temperatures the cooling and heating coils see during their respective seasons which is fast becoming an
issue.
Some of the errors I've encountered:
Massive overheating (+230 deg C) - set a minimum condenser loop flow rate of 0.0001 m^3/s.
Very low loop temps (-40 deg C) - Ditto above.
Plant not workingas expected - Hidden in the input output reference any HeatPump:WaterToWater:EquationFit:Heating & Cooling or
- HeatPump:WaterToWater:ParameterEstimation in branches must be cooling coil first, heating coil second and don't forget the splitter/mixer too!
- HeatPump:WaterToWater:ParameterEstimation in branches must be cooling coil first, heating coil second and don't forget the splitter/mixer too!
Have you checked your coefficients for equation fit and have you used enough points to get them in the first place? I used 584 data points and the accuracy is still not great (8% error)
I'm not sure how much (if nay) help that will be
but good luck........any ideas how I can overcome my problems?!
Mark
From: Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Wednesday, 6 March 2013, 17:19
Subject: Re: [EnergyPlus_Support] Re: water to water heat pump
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Wednesday, 6 March 2013, 17:19
Subject: Re: [EnergyPlus_Support] Re: water to water heat pump
You might post your errors--- did you check your node connections?
-- ![]()
On Wed, Mar 6, 2013 at 8:48 AM, aleph_venturini <aleph.venturini@xxxxxxxxx> wrote:
Hello! Did you eventually solve your problem with the GSHP?
I am trying to simulate both a cooling and a heating plant with ground-coupled water to water heat pumps, but I always get errors or the plant does not work.
I have tried the following:
- GroundHeatExchanger:Vertical
- GroundHeatExchanger:Pond
- HeatPump:WaterToWater:EquationFit:Heating & Cooling
- HeatPump:WaterToWater:ParameterEstimation:Cooling & Heating
in all cases I copy/pasted the GSHP objects from the E+ example files into my idf, but i cannot get a working simulation and I don't understand where the errors i get could come from.
I'd be very glad to know if someone of you did get some GSHP plant actually running... thanks
Alessandro
--- In mailto:EnergyPlus_Support%40yahoogroups.com, "direzionecontraria" wrote:
>
> Thank you very much to both! I think that I'll use those spreadsheets a lot.
>
> --- In mailto:EnergyPlus_Support%40yahoogroups.com, Linda Lawrie wrote:
> >
> > And if you want to look for where specific objects are found in the
> > example files, click on the Example Files Links to Objects spreadsheet.
> >
> > At 07:02 AM 9/6/2012, Dru Crawley wrote:
> >
> >
> > > From your Start button, go to: All Programs, EnergyPlus V7-1-0, and
> > > click on Example Files Summary Spreadsheet. That lists all the
> > > example files that ship with EnergyPlus along with a short summary.
> > >
> > >You're looking for GSHP (ground source heat pump).
> > >
> > >
> > >
> > >On Thu, Sep 6, 2012 at 3:31 AM, FrancescoP
> > >< direzionecontraria@> wrote:
> > >
> > >
> > >What example files regarding geothermal water to water heat pumps
> > >are available?
> > >Regards
> > >
> > >--- In
> > >mailto:EnergyPlus_Support%40yahoogroups.com,
> > >Germana Regis wrote:
> > > >
> > > > Dear all,
> > > >
> > > > I'm trying to simulate a geothermal water to water (equation fit)
> > > heat pump.
> > > > I used the example file as a reference but something doesn't work
> > > and I can't
> > > > explain why.
> > > > I have two loops, a cooling and a heating one and they work separately in
> > > > different seasons.
> > > > In summer conditions the heat pump works correctly but in the
> > > heating mode it
> > > > doesn't start at all.
> > > > The pump works, there is fluid circulation into the low
> > > temperature radiant
> > > > floor but the heat pump doesn't contibute to rise up the
> > > temperature of the
> > > > water.
> > > > I also tried to put a boiler beside and, of course, it satisfies
> > > the heating
> > > > demand of the zone, although it doesn't have the priority.
> > > > It seems like the HP is not connected at all, but branches don't
> > > produce any
> > > > error message.
> > > > Is there anybody who has an idea on what (maybe) is going on?!?!
> > > > Thank you very much!
> > > > Germana
> > > >
> > >
> > >
> > >
> > >
> > >
> >
>
Jeremiah D. Crossett | Senior Analyst | Phase Change Energy Solutions
120 E. Pritchard St. | Asheboro, NC 27203 | Mobile 503-688-8951
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