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How to utlize PI Performance Equation for a 2-dimension interpolation

Question asked by Dr.Zhou on Nov 16, 2018
Latest reply on Nov 19, 2018 by Eugene Lee

Dear All,

I'm trying to employ PI Perfromance Equation to create a 2-dimension interpolation, as showed below. Say, to get to know the exact "condenser pressure" when "thermal load of condenser" were set to be 40%, as where the red circle shows.

As for a 1-dimension interpolation I may utilize the "curve" function, where the arguments should be "numerical constants" referring to the manual. After getting 5 curves by the "curve" PE functions, how could I proceed to the 2-dimension interpolation?