first update of Cv calculation

[EvenSol]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 84.05797% with 44 lines in your changes missing coverage. Please review.

Project coverage is 41.30%. Comparing base (540fed8) to head (b747a63).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...icaldesign/valve/ControlValveSizing_IEC_60534.java	84.37%	7 Missing and 18 partials ⚠️
.../mechanicaldesign/valve/ValveMechanicalDesign.java	80.00%	7 Missing and 2 partials ⚠️
...eqsim/process/equipment/valve/ThrottlingValve.java	90.76%	4 Missing and 2 partials ⚠️
...c/main/java/neqsim/thermo/system/SystemThermo.java	0.00%	0 Missing and 2 partials ⚠️
src/main/java/neqsim/util/unit/RateUnit.java	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1259      +/-   ##
============================================
+ Coverage     41.15%   41.30%   +0.15%     
- Complexity     6030     6074      +44     
============================================
  Files           722      724       +2     
  Lines         68312    68512     +200     
  Branches       8162     8187      +25     
============================================
+ Hits          28112    28301     +189     
+ Misses        38519    38511       -8     
- Partials       1681     1700      +19     

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