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[EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting
From: "applezealot" <applezealot@xxxxxxxxxxxx>
Date: Mon, 23 May 2005 03:03:23 -0000
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Dear Sam

     I am a gradute student in Shanghai Jiaotong University. If you 
have the problem of reading Chinese,it will be alright that we could 
still discuss in English. Thank you very much for your patient and 
help. We start using the software about half a year. And I need to 
use E+ to complete my thesis. So I won't hesitate to ask you for your 
help if I get into trouble with E+
     Best wishes
     See you
                                                        charlie
     

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, wing sun lee 
<samwslee@y...> wrote:
> 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@y...> »¡¡G
> 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 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > The primary EnergyPlus web site is found at:
> > > > http://www.energyplus.gov
> > > > 
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Follow-Ups:
- Re: [EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting
  - From: wing sun lee

References:
- Re: [EnergyPlus_Support] Re: EIR Chiller Performance Curve Fitting
  - From: wing sun lee

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