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Re: [EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting
From: wing sun lee <samwslee@xxxxxxxxxxxx>
Date: Sun, 22 May 2005 12:08:15 +0800 (CST)
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Hi,
 
Ok, but I type Chinese Word very slowly and I worry about that I can see the simplified words in my computer. May be you can try it!
 
I live in Hong Kong and work at Government Department, so I have chance to use EnergyPlus to simulate various Government property in Hong Kong. Since I have successfully simulate two nos of the Government Buildings, those simulation results can reflect the actual energy use.
 
If you have any problem, please don't hesitate to discuss with me.
 
**Which university you study?
 
SAMLEE 

applezealot <applezealot@xxxxxxxxxxxx> 說：
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...> 說：
> 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...> 說：
> > 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...> 撰寫:
> > > 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...> 撰寫:
> > > > 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 
> > > 
> > > 
> > > 
> > > 
> > > The primary EnergyPlus web site is found at:
> > > http://www.energyplus.gov
> > > 
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> > > 
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- [EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting
  - From: applezealot
- Re: [EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting
  - From: mathaase

References:
- [EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting
  - From: applezealot

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