Curve Fit Tool - Press To Generate Curve Problem

asked 2017-07-12 14:55:08 -0500

jmoody gravatar image

updated 2017-07-12 18:19:19 -0500

When I run the ManageCurveFit Macro nothing happens. All of the coefficients are "000000". Any ideas? I made sure to enable Macros and adjusted the Trust Center Settings and still nothing happens.

This is true on both the downloaded version with E+ 8.7.0 and the CurveFit Improved version.

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I think this can happen if your performance data does not contain enough variation, i.e. one or more of the independent variables are constant.

MatthewSteen gravatar imageMatthewSteen ( 2017-07-12 15:19:43 -0500 )edit

I have the chilled water supply temperature entered as the independent variable 1 and it is constant as that is how the rating was done. The condenser water inlet temperature varies.

jmoody gravatar imagejmoody ( 2017-07-14 08:09:59 -0500 )edit

That's the reason then. The curve fits require variation in the independent variables, see the INSTRUCTION sheet for examples. I've also found that the performance data I get from designers often has constant CHW temps, which doesn't allow for generating the curve coefficients.

MatthewSteen gravatar imageMatthewSteen ( 2017-07-14 08:32:08 -0500 )edit