This is the engine of the spreadsheet.
: Start by clearly stating what the spreadsheet does. For example, "This XLS tool streamlines the complex 1-D thermodynamic modeling required to design steam or gas ejectors, calculating critical dimensions such as the motive nozzle throat and diffuser geometry". Technical Parameters (Inputs/Outputs) : Motive Stream : Pressure ( Ppcap P sub p ), Temperature ( Tpcap T sub p ), and Mass Flow Rate ( Suction/Entrained Stream : Pressure ( Pscap P sub s ), Temperature ( Tscap T sub s ), and Molecular Weight. Calculated Results : Entrainment Ratio ( ), Throat Area ( A*cap A raised to the * power ), and Dry Air Equivalent (DAE) ratings. ejector design calculation xls
While empirical, this is highly reliable for preliminary sizing and is easily embedded in XLS. This is the engine of the spreadsheet
: Input the constants (A-J) into a hidden table to reference in your calculation formula. Solve for Geometry : Use the area ratio formulas to output the required Nozzle Throat Diameter Mixing Section Diameter Validation Ejector Capacity Calculator or similar tools to cross-check your results. ✅ Summary of Results The design of an ejector in Excel requires solving for the Entrainment Ratio ( using pressure ratios ( ) and empirical constants, then applying Area Ratio : Input the constants (A-J) into a hidden
For compressible fluids: [ A_t = \fracW_motiveP_1 \cdot \sqrt\frac\gammaR_gas T_1 \cdot \left(\frac2\gamma+1\right)^\frac\gamma+1\gamma-1 ] (Implemented as Excel formula with named constants)