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[EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting
Dear Sam
Thank you very much for your help. And nice meeting you through
the internet. I am a graduate student in shanghai studying E+ for
about 4 months. Are you a chinese too? Maybe we speak our lanaguage
to discuss the issues about the software.
Is that OK for you?
charlie
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, wing sun lee
<samwslee@y...> wrote:
> Hi Charlie,
>
> As compare between predicted simulation result and the actual
energy use, the error is within 5%. So it is realistic.
>
> SAMLEE
>
> applezealot <applezealot@y...> »¡¡G
> Hi Sam
> I gott you. But I am not sure that the third curve you defined
is
> able to simulate the chiller performance. Since you have done some
> work on the chiller module, does the results show the correctness?
> Thank you very much for your help
>
> charlie
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, wing sun lee
> <samwslee@y...> wrote:
> > Hi Charlie,
> >
> > As you know 1) the PRL is equal to the rated cooling load divided
> by the available cooling load. e.g. from the manufacture, tha
> standard rating for the specific leaving chilled water temperature
> (6.7oC) and the entering air temperature (35oC).
> > 2) the value ChillerEIRFPLR (Y) is EIRavailable / (EIRdesign x
> PRL). You can refer to the EngineeringDoc P.338.
> >
> > SAMLEE
> >
> > applezealot <applezealot@y...> »¡¡G
> > Dear sam
> >
> > I check your excel file. I have some question about your
> > calculation:
> > 1. You used (Qr/Qa) as PLR and (Pa/Pr) as EIR output ratio for
> the
> > third.I get confused about these settings. Could you please tell
> me
> > why you choose these parameters? P.S. Pa,Pr,Qa,Qr are power
> > available, power rated, capacity available and capacity rated.
> > 2. And I look into the curve fitting results in sheet1 of your
> > file. Is it related to our discussion? I can not understand the
> > purpose of this sheet. Please explain it for me.
> >
> > Thank you in advance
> > charlie
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, wing sun lee
> > <samwslee@y...> wrote:
> > > Hi,
> > >
> > > Please go here
> >
>
http://groups.yahoo.com/group/EnergyPlus_Support/Files/Problem_Submit
> > tals/Input Problem/Fit curve biquadratic d.xls
> > >
> > > It seems to be corrected and solved
> > >
> > > SAMLEE
> > >
> > >
> > > donbshireyiii <shirey@f...> ¼¶¼g:
> > > Charlie and SAMLEE,
> > >
> > > In the spreadsheet you are using, it looks like EIR as a
function
> > > of PLR is not being properly calculated.
> > >
> > > The spreadsheet seems to be using available capacity at the
> current
> > > operating conditions divided by the design (rated) capacity of
> the
> > > chiller. This is not correct.... is should be just as the
> > > input/output reference says... PLR = (cooling load) divided by
> > > (available capacity at the current operating conditions).
> > >
> > > Don
> > >
> > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, wing sun lee
> > > <samwslee@y...> wrote:
> > > > Hi Charlie,
> > > >
> > > > I just use your advice that the PRL shoudl equal to the ratio
> of
> > > cooling load to the available capacity.
> > > > Please see my attached file at
> > > http://groups.yahoo.com/group/EnergyPlus_Support/F
> > > iles/Problem_Submittals/Input
> > > Problem/Fit curve biquadratic b.xls
> > > >
> > > > SAMLEE
> > > >
> > > > energypluser <energypluser@y...> ¼¶¼g:
> > > > Dear Mike,
> > > >
> > > > I wanna simulate a electric chiller with the EIR module.
> > And I
> > > > found that you give a EXCEL example for the curve fitting.
But
> I
> > > think
> > > > the third curve in your example file may not be correct.
> > > > According to the input/output reference, the third curve
> is
> > > the
> > > > EIR output ratio in function of Part Load Ratio. The PLR
> > > calculation in
> > > > your file is the ratio of the available capacity to the
> nominal
> > > > capacity. In my opinion, PLR should equal to the ratio of the
> > > cooling
> > > > load to the available capacity. Am I right?
> > > > If I am right, could you please tell me how to obtain
the
> > > third
> > > > curve for my simulation based on the manufacturer catalog.
> > > > Thank you in adavance
> > > >
> > > >
> > charlie
> > >
> > >
> > >
> > >
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