Ejector Design Calculation Xls

If you are building your workbook, let me know if you need help with , sizing multi-stage systems , or creating condenser balance equations . Share public link

The motive steam pressure should be at least 1.5 to 2 times higher than the discharge pressure to avoid unstable flow or "break" conditions.

A sample chart generated from the spreadsheet shows that increasing ( P_m ) from 5 to 10 bar raises ω by ~40% for constant back pressure.

While XLS tools are excellent for preliminary sizing and "what-if" scenarios, they usually rely on . For complex designs involving two-phase flow or highly sensitive geometries, Computational Fluid Dynamics (CFD) is often required to validate the Excel results. ejector design calculation xls

Rm=mmotivemsuctioncap R m equals the fraction with numerator m sub m o t i v e end-sub and denominator m sub s u c t i o n end-sub end-fraction Critical Flow Through the Motive Nozzle

| Sheet Name | Content | |------------|---------| | | Operating fluids, pressures, temperatures, mass flow rates | | Fluid Properties | Gas constant, specific heat ratio, saturation tables (if steam) | | Nozzle Calc | Motive nozzle throat & exit diameters, Mach number | | Suction Calc | Suction mass flow capacity | | Mixing & Shock | Momentum balance, shock Mach, pressure rise | | Diffuser | Final discharge pressure, efficiency | | Results | Entrainment ratio, area ratio, performance curves | | Charts | ω vs. compression ratio, parametric sweeps |

The primary metric of ejector efficiency is the Entrainment Ratio ( ), defined as: If you are building your workbook, let me

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The primary gas enters the nozzle, where it expands to supersonic speed. The throat area ( Atcap A sub t ) is determined by critical mass flow. Critical Pressure Ratio: B. Mixing Section (Entrainment)

A document that outlines the structure of a widely used Excel sheet for entrainment and area ratios. While XLS tools are excellent for preliminary sizing

[ CR = \fracP_3P_2 \quad \text(absolute pressures) ]

If you are looking for the underlying theory to build your own model, the following papers are the industry standard:

Motive Fluid (High Pressure) | v [ Motive Nozzle ] ---> (Converts Pressure to Supersonic Velocity) | Suction Fluid ------------> [ Mixing Chamber ] (Fluids mix at constant pressure) (Low Pressure) | v [ Diffuser ] ---> Discharge (Intermediate Pressure)

Ensure mixing velocities do not exceed sonic speeds inappropriately (unless designed to). Optimize Motive Flow: Minimize Wmcap W sub m for the required Wscap W sub s to reduce energy costs. Benefits of the XLS Approach Speed: Instant recalculation when changing inputs.