Ejector Design — Calculation Xls
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)
When verifying your .xls calculations against field data, keep these practical design limits in mind:
The entrainment ratio dictates how many kilograms of motive steam are required per kilogram of suction fluid. ejector design calculation xls
| Section | Contents | Key Inputs/Outputs | | :--- | :--- | :--- | | | Motive & Suction Conditions | (P_0), (T_0), (P_s), (T_s), mass flow rates | | Gas Properties | Fluid Data | k, R, molecular weight | | Target Performance | Design Goals | Desired Er, Cr | | Nozzle Calculation | Motive Nozzle Sizing | Aₜ, Dₜ | | Mixing Section Calc | Mixing Diameter | Ar, A₂, D₂ | | Diffuser Calculation | Diffuser Sizing | Diffuser efficiency, discharge pressure | | Results Summary | Key Outputs | All dimensions, final performance predictions |
: The ratio of the compressed vapor pressure to the entrained vapor pressure. Entrainment Ratio ( Motive Fluid (High Pressure) | v [ Motive
An saves hours of manual iteration and helps you avoid undersized or oversized ejectors. Whether you’re designing a new vacuum system or checking an existing one, a well-built spreadsheet is a powerful tool.
When downloading from independent sites, always validate the results against a known case or a commercial tool before using them for final design. Whether you’re designing a new vacuum system or
For decades, engineers have relied on specialized software or complex hand calculations. But with the power of , you can create a transparent, flexible, and accurate ejector design calculation spreadsheet (.xls) . This article provides a comprehensive guide to the theory, step-by-step calculations, and the structure of a professional-grade .xls tool.
w=A×ErB×PcC×PpD×e[G+H×ln(Pc)]w equals cap A cross cap E r to the cap B-th power cross cap P sub c to the cap C-th power cross cap P sub p to the cap D-th power cross e raised to the open bracket cap G plus cap H cross l n open paren cap P sub c close paren close bracket power
) and for both choked and non-choked flow conditions. Ejector Calculation Formulas
Calculate the basic dimensionless numbers: