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[EnergyPlus_Support] Re: GSHP Modeling Question about spreadsheet parameters
Have you tried performing some calculations manually?
In the past, I have calculated part-load coefficients, enetered them
in E+ and found that the performance was very different than I expected.
To check myself, I
1) reported all important variables (such as zone temp and entering
water temp for your GSHP)
2) calculated the capacity in a spreadsheet using source
(manufacturer) data
3) compared it to the E+ prediction.
In one case, I forgot to convert US measures to SI. Often, it becomes
evident that I need more report variables to fully understand the
current conditions that E+ is working with.
Good luck!
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Elreq" <tolteca33@...> wrote:
>
> Thanks for confirming, I aksed this since I having troubles with the
> GSHP modeling:
> I have estimated the coefficients of the GSHP using the Equation-Fit
> model, having errors less than 10%, but the results of the simulation
> show that the performance of the heat pump is not as the catalog
> suggests, in particular, for the heating mode, I get a very low
> temperature difference between the inlet and outlet temperature of the
> water, a maximum of 5 ºC where it should be more than 10 ºC.
>
> I am not sure if the error is on the coefficients or if it is in the
> plant side, where I have an low temperature radiant sytem of constant
> flow, which worked fine before implementing the Heat Pump.
>
> In both examples, the GSHP-GLHE.idf and GSHP Simple-GLHE.idf from the
> Eplus documentation, the inlet and outlet temperatures in the load
> side are almost the same for the heating mode, this doesnt seem to be
> right either.
>
> Suggestions appreciated.
>
> Regards,
> Santiago
>
>
>
>
>
>
>
> -- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Sankar Padhmanabhan
> <sankar.padhmanabhan@> wrote:
> >
> > Santiago,
> > Yes you are right. Entering water temperature means the condition of
> > water that enters the HEAT PUMP.
> >
> > Regards
> > Sankar
> >
> > Elreq wrote:
> > >
> > > Dear Forum,
> > >
> > > I am modeling a GSHP system, for which I used the spreadsheets for
> > > generating the coefficient parameters (both parameter estimation and
> > > equation fit)that need to be introduced in the E+ GSHP objects. But
> > > during the process I ran into a confusion about the terms of the
> > > parameters on the spreadsheet; my question is:
> > > Is the Load Side Entering Water Temperature referring to the water
> > > that is entering the heat pump or that is entering the zone to be
> heated?
> > >
> > > I have assumed that it is the first, that is, the water that is
coming
> > > into the heat pump after circulating the zone to be heated, but
I ask
> > > this just to make sure.
> > >
> > > Thanks in advance
> > > Santiago
> > >
> > >
> >
> > --
> > Sankar Padhmanabhan
> > Graduate Research Assistant
> > PhD Student
> > Mechanical & Aerospace Engg
> > Oklahoma State University,
> > Stillwater, OK-74078
> > Ph:405-744-4380
> >
>
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