Ejector Design Calculation Xls [hot] (2025)

Motive nozzle conditions

Steam jet ejectors are critical components in process industries, widely used to create vacuum conditions in distillation columns, evaporators, and condensers. Designing an efficient ejector requires precise mathematical modeling of fluid dynamics, thermodynamics, and gas laws.

Never assume 100% mechanical efficiency. Nozzles generally operate at 95–97% efficiency, mixing sections at 85–90%, and diffusers at 75–85%. Ensure your Excel sheet includes explicit cell variables for these factors. ejector design calculation xls

Implement data validation drops-downs for units (e.g., bar, Pa, Torr). Tab 3: Core Calculations (The Engine) Calculates throat diameter ( ) and exit diameter ( Mixing Block: Computes mixture velocity and enthalpy.

The high-velocity jet creates a localized low-pressure zone, drawing in the suction fluid. The two streams mix, transferring momentum. Motive nozzle conditions Steam jet ejectors are critical

Implemented via iterative Goal Seek or explicit solve.

Compare your calculated motive steam consumption with performance curves from My Engineering Tools . Tab 3: Core Calculations (The Engine) Calculates throat

For deeper vacuum applications, engineers use , where the discharge from one ejector stage feeds the suction of the next. Interstage condensers (or intercondensers) are often placed between stages to condense the motive steam, drastically reducing the load on subsequent stages. Excel spreadsheets designed for multi‑stage systems allow the user to define the number of stages and intercondenser conditions, automatically balancing the load across each stage while tracking total steam consumption.

): Using Graham Corporation’s guidelines , determine the necessary motive steam to achieve the target vacuum.

) exceeds 4:1 to 5:1, a single-stage ejector will become highly inefficient. Program your XLS sheet to flag the user with a warning if a multi-stage system with intercondensers is required.