Ejector Design Calculation Xls Fixed ^new^ Jun 2026

An ejector uses the high velocity of a primary or to entrain, mix, and compress a secondary or suction fluid . This elegant process, free of moving parts, consists of four key sections:

A fixed-geometry ejector is highly sensitive to variations in operating conditions. If the actual field data shifts from the design case, performance drops rapidly. Issue A: Motive Pressure Drops Below Design Value

A "fixed" calculation sheet typically follows these logical steps: Entrainment Ratio ( Ercap E sub r

Calculated steam ejector dimensions diverge wildly from manufacturer data sheets. The Cause: Using ideal gas laws ( ejector design calculation xls fixed

This is where the user enters the constraints of the process. Group inputs logically:

): The spreadsheet calculates how much motive fluid is needed to move a unit of suction fluid. This is based on the pressure ratio ( Once Ercap E sub r is determined, the total steam consumption is calculated.

Diffuser calculation requires an iterative guess of the discharge density ( ρdrho sub d An ejector uses the high velocity of a

This sheet processes the inputs using fixed engineering formulas. Calculate Equivalent Air Mass Flow ( meqm sub e q end-sub

) of the motive fluid leaving the nozzle is calculated using the enthalpy drop:

No need to look up enthalpies manually.

To build a reliable, fixed Excel calculator, you must program specific thermodynamic equations. The calculation path relies on the , which dictates the efficiency of the unit. Step 1: Isentropic Expansion of Motive Fluid The ideal velocity ( Vmcap V sub m

Excel throws a circular reference warning, or the mixture velocity loops infinitely.