Vacuum Pump Capacity Calculation Xls ❲High-Quality × SECRETS❳

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"So the pump's effective capacity is $600 \times 0.85 = 510 m^3/hr$," Lucas calculated. "We need 800. We are way short." vacuum pump capacity calculation xls

To create a functional calculator, organize your columns with the following headers: : Input the Volume ( ) and Target Pressure ( Pendcap P sub e n d end-sub ) . Time Constraints : Define the Time ( Related search suggestions provided

A1: VACUUM PUMP CAPACITY CALCULATOR A3: SECTION 1 – INPUT DATA A5: Parameter B5: Value C5: Unit A6: Vessel volume (m³) B6: 2.5 C6: m³ A7: Desired pressure (abs) (mbar) B7: 10 C7: mbar A8: Atmospheric pressure (mbar) B8: 1013 C8: mbar A9: Pump-down time (minutes) B9: 10 C9: min A10: Leakage rate (mbar·L/s) B10: 0.5 C10: mbar·L/s A11: Outgassing rate (mbar·L/s) B11: 1.2 C11: mbar·L/s We are way short

S = V * (P / t) + Q

Field,Value / Formula,Units,Notes "Inputs - Process","",,"--" "Target Pressure (absolute)",0.1,bar,"Enter desired absolute pressure inside vessel (abs). Example: 0.1 bar (100 mbar)." "Initial Pressure (absolute)",1,bar,"Starting pressure in vessel (abs). Example: 1 bar = atmospheric." "Vessel Volume",1,m3,"Volume of the chamber or vessel." "Leak or Gas Ingress Rate (Q_leak)",0.0,m3/s,"If known, enter steady ingress (m^3/s) at standard conditions. Leave 0 if negligible." "Outgassing Rate (Q_outgassing)",0.0,m3/s,"Time-averaged outgassing (m^3/s)." "Process Gas Flow (Q_process)",0.0,m3/s,"Any process gas flow entering the chamber (m^3/s)." "Temperature",298.15,K,"Absolute temperature (K). Default 25°C = 298.15 K." "Reference Pressure (p_ref)",1,bar,"Reference pressure for volumetric flow normalization (usually 1 bar)." "Gas Molecular Weight (M)",28.97,g/mol,"Air ~28.97 g/mol; used if converting mass flow. Optional." "Compressibility Factor (Z)",1,,"Approx 1 for ideal gases at low pressure." "Units for pump spec","m3/h (at 1 bar)","", "Set units you want pump capacity shown in: m3/h, m3/s, L/min, or CFM." "", "", "", "" "Calculated intermediate values","",,"--" "Target Pressure (Pa)","=B2 1E5",Pa,"Convert bar to Pa. (If your sheet uses different cells, ensure matching.)" "Initial Pressure (Pa)","=B3 1E5",Pa, "Normalized total gas load (Q_total_std)","=B6 + B7 + B8 + B5",m3/s,"Sum of leak + outgassing + process + any user-specified additional flow (Q_leak in B5, Q_outgassing B6, Q_process B7, add others in B8)." "Pump speed at target pressure (S_req) [volumetric]", "=IF(B1>0, (B12 * B1) / B2, "Err")",m3/s,"Formula below computes required volumetric pump speed: S = (Q_total_std * p_ref) / p_target_abs, see notes. Replace cell refs as needed." "Conversion to chosen units","=IF(B11="m3/h", B13 3600, IF(B11="m3/s", B13, IF(B11="L/min", B13 60000, IF(B11="CFM", B13 2118.88, B13))))",B11,"m3/h = m3/s * 3600; L/min = m3/s * 60000; CFM ≈ m3/s * 2118.88" "", "", "", "" "Notes and formulas","",,"--" "Physical basis","S_req = Q_total_std * (p_ref / p_target_abs)","", "Volumetric pump speed must remove gas at the rate it enters, scaled from reference pressure to target absolute pressure." "Practical allowance factor","1.2","dimensionless","Multiply S_req by a safety factor to allow margin for uncertainties, leaks, and pump aging." "Final recommended pump speed (with margin)","=B13 * B18",B11,"Apply the practical allowance factor (cell B18)." "", "", "", "" "Example (Air, 1 m3 vessel, evacuate from 1 bar to 0.1 bar)", "", "", "" "Example - Inputs","",,"" "Target Pressure (abs)",0.1,bar, "Initial Pressure (abs)",1,bar, "Vessel Volume",1,m3, "Q_leak",0.0001,m3/s,"=0.36 m3/h leak (~0.1 L/s)" "Q_outgassing",0.00005,m3/s, "Q_process",0.0,m3/s, "Temperature",298.15,K, "p_ref",1,bar, "Units for pump spec","m3/h",,"" "Calculated - Q_total_std","=SUM(B27:B29)",m3/s,"Sum = 0.00015 m3/s" "p_target (Pa)","=B23 1E5",Pa,"0.1 bar = 10000 Pa" "S_req (m3/s)","=(B30 * B22) / B23",m3/s,"= (0.00015 m3/s * 1 bar) / 0.1 bar = 0.0015 m3/s" "S_req (m3/h)","=B31 3600",m3/h,"= 5.4 m3/h" "With margin (×1.2)","=B32 1.2",m3/h,"= 6.48 m3/h → choose next larger standard pump (e.g., 7 m3/h)"