Ejector Design Calculation Xls [best] Jun 2026

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

If steam condenses during expansion in the nozzle, ideal gas equations fail.

A robust Excel model must incorporate fundamental gas dynamics. The most common approach is the 1D modeling technique, often validated with empirical correlations. A. Primary Nozzle Flow (Motive Fluid)

The position of the normal shock wave in the diffuser throat deeply affects compression stability.

Sheet: "Plots"

Ant=Wmρt⋅atcap A sub n t end-sub equals the fraction with numerator cap W sub m and denominator rho sub t center dot a sub t end-fraction Sized to handle the combined mass flow ( ) at the critical mixing velocity. Tab 4: Performance Curve Generator

Do not hardcode a single efficiency value. Ejector efficiency degrades if the suction gas contains heavy liquids or if the motive steam is wet. Add a safety factor margin (typically 10-15%) to the calculated motive consumption.

, the equation simplifies to evaluate the momentum transfer efficiency, which usually ranges between 75% and 85% due to frictional losses. Step 4: Diffuser Pressure Recovery

): The mass flow rate of entrained vapor divided by the mass flow rate of motive steam. The ratio of discharge pressure ( Pccap P sub c ) to entrained vapor pressure ( Pecap P sub e ). Choked flow is generally defined as Expansion Ratio ( ): The ratio of motive steam pressure ( Ppcap P sub p ) to entrained vapor pressure ( Pecap P sub e Geometry Sizing: Determining the nozzle throat area ( A1cap A sub 1 ), nozzle outlet area ( A2cap A sub 2 ), and diffuser cross-sections. Foundational Research Papers ejector design calculation xls

For incompressible liquids: [ A_t = \fracW_motive\rho_1 \cdot \sqrt2 \cdot \Delta P_nozzle / \rho_1 ]

Then: [ A_2 = Ar \times A_t = 30 \times (1.47 \times 10^-5) = 4.41 \times 10^-4 \text m^2 ]

(This helps determine the mixing section diameter relative to the nozzle). Step-by-Step Excel Setup Define Inputs : Create a "Design Inputs" section for: Motive Steam Pressure ( cap P sub p ) and Flow Rate ( Suction Pressure ( cap P sub e ) and required Suction Flow ( Required Discharge Pressure ( cap P sub c Calculate Ratios Calculate Expansion Ratio Apply Empirical Constants

Ejector performance is typically calculated using the following variables: Entrainment Ratio ( If you are looking for the underlying theory

[ R = \fracW_suctionW_motive ] Used to determine ejector type (single-stage, multi-stage).

ΔPrecovery=ηd⋅[ρ⋅Vmixed22]cap delta cap P sub r e c o v e r y end-sub equals eta sub d center dot open bracket the fraction with numerator rho center dot cap V sub m i x e d end-sub squared and denominator 2 end-fraction close bracket 4. How to Structure Your Excel Spreadsheet

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