Calculations

From the beginning, VacTran has never used proprietary formulas in performing its calculations. All equations are from published sources, so the user can manually check results with labor-intensive hand calculations. Calculated data is continuously dumped to a text window, which can be examined or saved at any time.

By designing VacTran with textbook formulas and methods commonly taught in vacuum technology courses, modeling flexibility is limited compared with computational fluid dynamics (CFD) or Monte Carlo based modeling programs that are many times more expensive.  Please contact us if you have questions about your modeling needs and whether VacTran is an appropriate modeling tool for you.

VacTran users have bench marked calculations against existing vacuum systems over many years and reported comparable results to measured data.  

VacTran performs the following calculations:

Conductance vs pressure
Throughput vs pressure
Pump speed vs pressure
Delivered speed vs pressure
Delivered throughput vs pressure
Pump down time
Pump down time, no losses
Gas throughput vs time
Generate pump model
Compare conductances in station
Mean free path vs pressure

Compare conductance throughput Compare pump speeds in station
Compare pump throughput in station
Compare gas loads
Station conductance vs pressure
Station throughput vs pressure
Station pump speed vs pressure
Station pump throughput vs pressure
Station delivered speed vs pressure
Station delivered throughput vs pressure Gas load vs time