Ejector Design Calculation Xls |link| Jun 2026

Store thermodynamic constants and molecular weights here to feed your formulas via VLOOKUP or XLOOKUP . Water/Steam Molecular Weight: 18.02 Air Molecular Weight: 28.97 Universal Gas Constant ( ): 8314.46 Tab 3: Calculations & Dimensions Output

) for steam is approximately 0.546. Because the suction pressure is much lower than the critical pressure, the nozzle is always choked (sonic flow at the throat). The nozzle throat area ( Atcap A sub t

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.

Motive Fluid (Steam):

The critical geometric design parameter. The sheet calculates the ratio of the mixing tube area to the nozzle throat area to ensure sonic flow conditions are met: $$A_r = \fracA_throatA_nozzle$$

Lempor Ejector Calculator Beta 1.1 | PDF | Steam Locomotive - Scribd

mm⋅Vm,exit+ms⋅Vs,exit=(mm+ms)⋅Vmixturem sub m center dot cap V sub m comma e x i t end-sub plus m sub s center dot cap V sub s comma e x i t end-sub equals open paren m sub m plus m sub s close paren center dot cap V sub m i x t u r e end-sub Step 3.4: Diffuser Throat and Exit Sizing ejector design calculation xls

" by Hisham Al Dessouky, Hisham Ettouney, Imad Alatiqi, and Ghada Al-Nuwaibit (published in Chemical Engineering & Processing , 2002).

Your Excel formulas must execute a sequential engineering workflow. Here is the step-by-step mathematical breakdown. Step 1: Calculate the Entrainment Ratio ( ERcap E cap R

A diverging section that slows down the mixed fluid, converting kinetic energy back into static pressure higher than the suction pressure. 2. Essential Design Inputs for your XLS Tool Store thermodynamic constants and molecular weights here to

Adjust your motive mass flow until the ER matches the required suction process capacity. Size the Nozzle Throat (

Calculate:

w equals cap A center dot cap E r to the cap B-th power center dot cap P sub e to the cap C-th power center dot cap P sub c to the cap D-th power center dot exp open paren cap E plus cap F center dot cap P sub e plus cap G center dot cap P sub c plus cap H center dot l n open paren cap P sub p close paren plus cap I center dot cap P sub p to the cap G-th power center dot cap P sub c to the cap J-th power close paren The nozzle throat area ( Atcap A sub