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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: Tue, 31 May 2005 00:26:20 +0800 (CST)
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Hi Charli,
 
Still in planning, it would be one of the famous consultant company.
 
SAMLEE 

applezealot <applezealot@xxxxxxxxxxxx> 說：
Dear Sam

      I am studying in developing an absorption chiller which can use the recovery heat from 
chillers and engines. I reseach the chiller modules for the purpose. What will you do in 
shanghai? And who will you work for?

                                                                                      charlie

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, wing sun lee <samwslee@y...> wrote:
> Hi,
>  
> Which course or module that you are studying? May be I have a chance to work at 
Shanghai at the end of this year.  
>  
> SAM
> 
> applezealot <applezealot@y...> 說?G
> 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...> 說?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...> 說?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...> 說?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...> 撰?g:
> > > > > 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?g:
> > > > > > 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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