This Application returns the coefficients of the volumetric efficiency curve (C1, C2) interpolating data from user input and estimate efficiency for user input points.

PLease, refer to the following instructions:

1. Enter complete input Excel (where your original data is) file path + filename as in the following example: 
       C:\Users\myname\OneDrive\Desktop\folder1\InputExampleFile.xlsx
   (you will find Excel complete path + filename in your file property window)

2. Enter complete output Excel (where the points you want to estimate efficiency for are) file path + filename as in the following example: 
       C:\Users\myname\OneDrive\Desktop\folder1\EvaluateExampleFile.xlsx
    (you will find Excel complete path + filename in your file property window)

3. Press 'Load and calculate' button.

4.  Coefficients C1 and C2 will be calculated. Figure will show your Excel data points  + interpolating curve plot.

5. App will write an additional column in you output file with volumetric efficiency estimated values .

!!! Correct files format !!!!
Please, only enter Excel files with a structure such as in the attached example files
'InputExampleFile.xlsx' : pressure 'p' in [bar],  speed 'rpm' in [RPM], viscosity 'mu' in [cP], volumetric efficiency as 'etaV'.
'EvaluateExampleFile.xlsx' : pressure 'p' in [bar],  speed 'rpm' in [RPM], viscosity 'mu' in [cP] (additional column 'etaV' will be added to the file after app run).