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Re: [EnergyPlus_Support] Performance curves of electric chiller

To: EnergyPlus_Support@xxxxxxxxxxxxxxx, EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Performance curves of electric chiller
From: "Richard J. Liesen" <rliesen@xxxxxxxx>
Date: Thu, 02 Oct 2003 09:22:29 -0500
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Hello,

TCON    = Entering condenser water temperature = TCEnt required (from 
previous message)
TNCON   = Nominal entering condenser water temperature; = TCEnt rated (from 
previous message)
TCW     = Leaving chilled water temperature; = TELv required (from previous 
message)
TNCW    = Nominal leaving chilled water temperature. = TELv rated (from 
previous message)


Nominal Entering Condenser Water Temperature: = TNCON   =  TCEnt rated
This is the temperature of the water/air entering the condenser under 
nominal conditions.  To find the value for this in our data we have to 
locate the nominal conditions in the table of manufacturer's data.  A Map 
Point is a value of chiller capacity and power consumption at a given 
condenser temperature and leaving chilled water temperature.  Now the 
nominal condition map point must be identified.  Manufacturers try to 
provide a map point at or very close to nominal conditions and sometimes it 
takes a little judgement to decide which point is closest to the nominal 
conditions.  Otherwise, a couple of points can be selected and a run done 
for each to determine which results most accurately represent the data 
provided.

Nominal Leaving Chilled Water Temperature: = TNCW   = TELv rated
This is the temperature of the chilled water leaving the chiller at nominal 
operating conditions.  This is the chilled water temperature at the nominal 
conditions map point.

Second Entering Condenser Temperature: = TCON   = TCEnt required
This is the temperature of water/air entering the condenser at a second 
operating point which is still at the nominal capacity but not at nominal 
temperatures or nominal power.  You may have to interpolate to find this 
point.

Second Chilled Water Temperature: = TCW = TELv required
This is the temperature of chilled water leaving the chiller at a second 
operating point that is at the nominal capacity but not at nominal 
temperatures or nominal power.  This point may have to be 
interpolated.  Normally this point, or the second entering condenser 
temperature, has to be interpolated but not both.

The second temperatures at nominal capacity and the nominal values are used 
in calculating the equivalent temperature (Teq).  Teq is used to quantify 
the departure of actual temperatures from their nominal values, in a single 
variable as a function of entering condenser temperature and leaving 
chilled water temperature.

Thanks Richard Liesen


At 11:01 AM 10/2/2003, Wong, S L wrote:
>Dear Richard,
>
>How can define the Delta T using the data from catalogue? Have catalogue
>give out the required and rated condenser and evaporator temperatures and
>where can I find those data?
>
>lee
>
>At 08:26 AM 9/30/2003 -0500, you wrote:
> >Hello,
> >The TempRiseRate is defined in the IOReference manual on page 392 in the
> >new release documentation and is a user input.
> >
> > From the manual:
> >Field: Temp Rise Coefficient
> >This numeric field contains the electric chiller's temperature rise
> >coefficient which is defined as the ratio of the required change in
> >condenser water temperature to a given change in chilled water temperature,
> >which maintains the capacity at the nominal value.  This is calculated as
> >the following ratio:
> >TempRiseRate =  (TCEnt req - TCEnt rated)/(TELv req - TELv rated)
> >where:
> >TCEntrequired = Required entering condenser air or water temperature to
> >maintain rated capacity
> >TCEntrated = Rated entering condenser air or water temperature at rated
> >capacity.
> >TELvrequired = Required leaving evaporator water outlet temperature to
> >maintain rated capacity
> >TELvrated = Rated leaving evaporator water outlet temperature at rated
> >capacity
> >
> >
> >Thanks Richard Liesen
> >
> >
> >
> >At 09:22 AM 9/30/2003, Wong, S L wrote:
> > >Dear Richard,
> > >
> > >What's the definition of TempRiseRat?
> > >
> > >lee
> > >
> > >At 12:30 PM 9/29/2003 -0500, you wrote:
> > > >Hello,
> > > > From the EPlus source code is the definition of
> > > >DeltaTemp.  TempCondInDesign & TempEvapOutDesign are entered by the 
> User.
> > > >
> > > >!Calculate chiller performance from this set of performance equations.
> > > >!  from BLAST...Z=(TECONDW-ADJTC(1))/ADJTC(2)-(TLCHLRW-ADJTC(3))
> > > >!
> > > >         DeltaTemp= (TempCondIn   -  TempCondInDesign) / TempRiseRat &
> > > >                          - (TempEvapOut -  TempEvapOutDesign)
> > > >
> > > >!  from BLAST...RCAV=RCAVC(1)+RCAVC(2)*Z+RCAVC(3)*Z**2
> > > >!
> > > >          AvailNomCapRat =   CapacityRat(1) + CapacityRat(2) *
> > > > DeltaTemp       &
> > > >                                       + CapacityRat(3) * DeltaTemp ** 2
> > > >
> > > >
> > > >Thanks Richard Liesen
> > > >
> > > >
> > > >At 04:04 AM 9/26/2003, leeslwong wrote:
> > > > >Dear all,
> > > > >
> > > > >What is the equation to determine the delta T in the equation of
> > > > >Capacity Ratio Curve in Chiller:Electric?
> > > > >
> > > > >lee
> > > > >
> > > > >
> > > > >
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References:
- Re: [EnergyPlus_Support] Performance curves of electric chiller
  - From: Richard J. Liesen
- Re: [EnergyPlus_Support] Performance curves of electric chiller
  - From: Wong, S L
- Re: [EnergyPlus_Support] Performance curves of electric chiller
  - From: Richard J. Liesen
- [EnergyPlus_Support] Performance curves of electric chiller
  - From: leeslwong
- Re: [EnergyPlus_Support] Performance curves of electric chiller
  - From: Wong, S L

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