Curve Fit Tool - Press To Generate Curve Problem

asked 7 years ago

jmoody's avatar

updated 7 years ago

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.

Preview: (hide)

Comments

2

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's avatar MatthewSteen  ( 7 years ago )

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's avatar jmoody  ( 7 years ago )
3

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's avatar MatthewSteen  ( 7 years ago )