A17: SECTION 3 – REQUIRED EFFECTIVE PUMPING SPEED A18: ln(P_start/P_target) B18: =LN(B8/B7) A19: Seff (L/s) B19: =((B6*1000)/B15) B18+(B14/B7) A20: Seff (m³/h) B20: =B19 3.6
Sfinal=S×SFcap S sub f i n a l end-sub equals cap S cross cap S cap F 3. Designing the Excel Sheet Architecture
Where:
| Parameter | Unit | Value | | --- | --- | --- | | System Volume (V) | L or m³ | | | Gas Load (Q) | L/s or m³/h | | | Desired Vacuum Level (P) | mbar or Torr | | | Pumping Time (t) | seconds or hours | | | Required Pump Capacity (S) | L/s or m³/h | | vacuum pump capacity calculation xls
"It’s a ratio," Lucas realized. "The volume of vapor is proportional to the ratio of pressures."
: A broader utility for pump sizing and design parameters.
[ t = \fracVS \cdot \ln\left(\fracP_iP_f\right) ] A17: SECTION 3 – REQUIRED EFFECTIVE PUMPING SPEED
Relying strictly on the basic formula can cause under-sizing in real-world operating environments. Ensure your calculation accounts for these variables:
Program these cells using standard Excel functions to calculate the results instantly. Theoretical Pumping Speed (
trapped inside the vessel (Pull-down load). [ t = \fracVS \cdot \ln\left(\fracP_iP_f\right) ] Relying
Where $S_outgassing = \frac\textoutgassing rate \times \textsurface area\textoperating pressure$.
Enter total internal pipe volume (e.g., 50 ) | Liters Total Volume (V_total): Excel Formula: =B1+B2 | Liters
Alex knew pumps have different speeds at different pressures. So they added: