# Re: [EnergyPlus_Support] Performance curves of electric chiller

```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.
> >!
> >         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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>[Non-text portions of this message have been removed]
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