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PG&E Cool Tools Chiller tool- Generating Performance Curve E+

asked 2017-05-29 10:10:44 -0600

updated 2017-05-29 11:28:14 -0600


Is it possible to use performance coefficient generated by PG&E Cool Tools Chiller tool can be used as an input in E+? It is my understanding that the chiller curve data are dimensionless ratios, so the curve-fits should work regardless of units-system. The raw data would be different, but the curve coefficients should be identical.Is it so??

Please help!


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You can also try the EnergyPlus curve fit tool. You'll find a macro enabled excel spreadsheet in your EnergyPlus installation folder - in the PreProcessing directory.

TomB's avatar TomB  ( 2017-05-29 15:28:32 -0600 )edit

Thanks. I tried to use the excel sheet and also referred post on the same topic "How to determine custom chiller performance curves with correct coefficients" posted on 22 March 2016. I followed the steps and it has generated IDF with the performance curve objects but all the values are zero. Have you encountered such issues ever?


Javed's avatar Javed  ( 2017-05-30 04:45:39 -0600 )edit

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answered 2017-08-20 23:49:32 -0600

I recently asked this same question- and the answer is no, the chiller curve coefficient are unit-dependent. You need to convert them to use them in different unit systems.

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@Anna Osborne Brannon, I just noticed that there is a tool in the PreProcess folder of the Energy Plus installation that appears to convert IP curves to SI curves. Look in the "CoeffConv" folder under "PreProcess". From the ReadMe.txt in that folder: "CoeffConv is a program to convert DOE-2 temperature dependent curves in Fahrenheit to EnergyPlus curves in Centigrade. The program converts the Doe-2 coefficients of a biquadratic curve to the equivalent EnergyPlus biquadratic curve coefficients."

Molly Curtz's avatar Molly Curtz  ( 2018-03-13 13:49:32 -0600 )edit

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Asked: 2017-05-29 10:10:44 -0600

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Last updated: Aug 20 '17