Calculation of Evacuation Times

The entire volume that has to be evacuated is required to calculate the efficiency of the vacuum system.

V_G = V₁ + V₂ + V₃ + V₄ + V₅ + ...

V_G = Volume to be evacuated [m³]
V₁ = Volume of suction cups [m³]
V₂ = Volume of mounting elements [m³]
V₃ = Volume of vacuum hoses [m³]
V₄ = Volume of distributor [m³]
V₅ = Volume of prefilter (if necessary) [m³]
V₆ = Volume of solenoid valve (if necessary) [m³]
...

Example:
V_G = 6 x 35 cm³ + 6 x 9.5 cm³ + 6 x 43 cm³ + 1 x 38.5 cm³
V_G = 564 cm³ = 0.000564 m³

Calculation of evacuation time t [h]

t = (V_G x In (P_a/P_e) x 1,3)/V

V_G = Volume to be evacuated [m³]
In = Natural logarithm
P_a = Absolute start pressure [1,013 mbar]
P_e = Absolute final pressure [mbar]
V = Suction rate of vacuum generator [m³/h]

Example:
t = (0.000564 m³ x In (1,013 mbar / *400 mbar) x 1.3) / 6.95 m³
t = 0,0000980 h = 0,35 sec

*60% = 400 mbar absolute