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Re: [EnergyPlus_Support] Absorption Chiller data for EnergyPlus

The minimum and maximum PLR specifies how you want your chiller to 
operate, usually these are set to 0 and 1, respectively, but the minimum 
may be set higher than 0 if necessary. The optimum PLR is the point 
where you get the highest efficiency, the optimum PLR is used when the 
plant is optimally controlled (see PlantLoop input for Load Distribution 
Scheme). The optimum PLR is also more important for plants with multiple 

As for your performance curves, EnergyPlus does not have standard curves 
for absorption chillers. You must use the manufacturers data to create 
these curves. This is done using regression analysis on a large data set 
and is based on the specific equations used for each performance curve.

There is an example for how to do this on the Yahoo site under 
Files/Examples. Excel Biquadratic Fit.zip shows the methodology using 
the LineST function. You will have to adapt this methodology to the 
absorption chiller equations. Alternatively, if you have the add-in for 
Excel, the regression analysis is found under the Tools menu for Data 

Paulo Jose Schiavon Ara wrote:
> Hello,
> I'm trying to define the absorption chiller for my simulation other 
> them the absorption chiller presented in the example file.
> When looking for the chiller parameters among the absorption chillers 
> catalogs, I'm not finding the parameters needed for EnergyPlus 
> simulation such as Part Load Ratio (Minimum, Maximum and Optimum), 
> Generator Steam Input Curve, etc.
> I would like to know if is it possible to find this data in other 
> sources or if is there a way to estimate these parameters by myself 
> based on the data about COP, temperatures and flow rate which I can 
> obtain from catalogs.
> Thank you very much,
> Paulo Ara.
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Richard A. Raustad
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