BUG: input parameter QJFRAC

[DanielePlacidoPolito]

Describe the bug
Input parameter QJFRAC does not work and/or does anything

To Reproduce
Steps to reproduce the behavior:

1. Go to file *operation.xlsx
2. Click on sheets STR_MIX or STR_SC or STR_STAB or Z_JACKET
3. Scroll down to line 17, 15, 17, 17 respectively
4. Set the parameter value
5. Save and run the software
6. See error

Expected behavior
The heat given in input to the component should be reduced leading to a lower temperature increase.

Desktop (please complete the following information):

• OS: Windows 10