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Re: [EnergyPlus_Support] inputs for EIR performance cureve
Where is this equation from? I am not finding it in the documentation.
CHILLER:ELECTRIC:EIR does not use delta temperature in its equations.
Mike
On 10 Sep 2007 at 22:59, Ian Doebber wrote:
> For the Chiller EIR input, below is the equation to calculate the EIR
> based on the Part Load Ratio. I am modeling air cooled chillers.
>
>
>
> What is "r1" and "dT" refer to? I'm assuming that "r1" is the actual
> cooling load divided by the maximum cooling capacity based on the
> condenser temperature (ambient dry bulb temperature) and "dT" is the
> difference between the chilled water supply and return temperature
> (which is 10 with 44 supply and 54 return). I'm getting numbers that
> are extremely low especially for low PLRs. I would think that the
> maximum efficiency would be around 40-60% PLR but am not seeing this.
>
>
>
> BI-QUADRATIC-RATIO&dT The curve is bi-quadratic in 2 independent
> variables. It has the form
>
>
>
> f(r1,dT) = c1 + c2*r1 + c3*r12 + c4*dT
> + c5*dT2 + c6*r1*dT,
>
>
>
> where c1, c2, c3, c4, c5, and c6 are
> coefficients. R1 is a dimensionless variable. dT is a variable with
> units of delta temperature.
>
>
>
> Ian
>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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