User enters process conditions (Pressures, Temperatures, Flow Rates, Fluid types).
): The average molecular weight of the process gas mixture, which dictates the entrainment ratio. Discharge Properties Discharge Pressure ( Pdcap P sub d
Then: W_m = W_s / R (kg/h)
ER=msmm≈0.5⋅(PmPs)0.5⋅ln(PsPd)⋅MWsMWmcap E cap R equals the fraction with numerator m sub s and denominator m sub m end-fraction is approximately equal to 0.5 center dot open paren the fraction with numerator cap P sub m and denominator cap P sub s end-fraction close paren to the 0.5 power center dot l n open paren the fraction with numerator cap P sub s and denominator cap P sub d end-fraction close paren center dot the square root of the fraction with numerator cap M cap W sub s and denominator cap M cap W sub m end-fraction end-root Step 3: Size the Motive Nozzle Throat ( Atcap A sub t
Many downloaded ejector design spreadsheets are unprotected, have broken macros, or use circular references that crash Excel. The Solution: Build your own fixed calculator using the standard Constant Area Mixing (CAM) model. ejector design calculation xls fixed
between single-stage and multi-stage systems. Suggest parameters for optimizing your motive pressure.
Ensure that the Mach number at the motive nozzle exit is supersonic ( for typical vacuum systems). The Solution: Build your own fixed calculator using
To construct a fixed Excel calculation sheet, you must execute the engineering steps in a specific mathematical sequence. Step 1: Define Your Design Variables
A "fixed" spreadsheet means the formulas have been validated against real-world empirical data, accounting for friction losses and gas compressibility that basic textbook equations often overlook. Why "Fixed" Matters Ensure that the Mach number at the motive