Ejector Design Calculation Xls Fixed New! (2025)

Converts the pressure energy of the motive fluid into high-velocity kinetic energy (

executing expansion, mixing, and compression formulas. 5. Datasheet Output

Are you experiencing a specific in your current spreadsheet?

Converts high-pressure energy into high-velocity kinetic energy.

where P_d is the discharge pressure and P_s is the suction pressure. ejector design calculation xls fixed

Detailed empirical formulas and constants for steam ejectors are available in this Steam Ejector Calculations PDF Preliminary Screening: Online tools from manufacturers like allow for preliminary screening before formal design. Sizing Charts: For manual estimation, reference typical suction pressure ranges for different stages (1-stage to 6-stage). area ratio calculation for your current setup? Steam jet Ejectors

Given their widespread use, a robust and standardized method for sizing and rating these devices is not just convenient; it is a necessity. This is the primary driver behind the development of specialized ejector design spreadsheets.

If you are building or auditing an Ejector Design XLS, it should contain the following specific tabs or sections.

An ejector is a device that uses a high-pressure fluid (motive fluid) to create a low-pressure region, which then draws in a secondary fluid (suction fluid). The two fluids mix and exit the ejector at a higher pressure than the suction fluid. Ejectors are commonly used in applications where a high-pressure fluid is available, and a lower pressure fluid needs to be boosted. Converts the pressure energy of the motive fluid

Organize inputs by fluid stream. Use clear color coding (e.g., light blue for user entry, grey for system constants). Description Motive Pressure ( Pmcap P sub m Supply pressure at nozzle inlet Motive Temperature ( Tmcap T sub m Supply temperature Suction Fluid (Gas/Vapor) Suction Flow Rate ( Wscap W sub s Target capacity Suction Pressure ( Pscap P sub s Target vacuum level Suction Temperature ( Tscap T sub s Process gas temperature Average Molecular Weight Weighted average of gas mix Discharge Conditions Discharge Pressure ( Pdcap P sub d Downstream piping backpressure Tab 2: Thermodynamic Property Lookup

Ejectors are highly sensitive to downstream pressure. If the actual system backpressure exceeds your calculated design discharge pressure ( Pdcap P sub d

What you are using (Steam, Air, Water, or Gas)? Whether the flow is subsonic or choked/sonic ?

The XLS fixed tool provides a fixed set of equations and assumptions, which are based on empirical correlations and theoretical models. The tool is user-friendly and allows for quick and easy calculations. The XLS fixed tool is widely used in industry and academia for ejector design and optimization. supersonic flow (which occurs when

To fix or build an XLS calculator, you must program the underlying thermodynamic equations. The calculation sequence follows mass, energy, and momentum balances. Entrainment Ratio ( The entrainment ratio dictates how much motive steam ( Wmcap W sub m ) is required to lift a specific amount of suction gas ( Wscap W sub s

In this mode, the geometry is Fixed :

The low-pressure suction fluid enters due to the vacuum created by the motive jet.

Vm=2⋅ηn⋅(kk−1)⋅R⋅Tm⋅[1−(PsPm)k−1k]cap V sub m equals the square root of 2 center dot eta sub n center dot open paren the fraction with numerator k and denominator k minus 1 end-fraction close paren center dot cap R center dot cap T sub m center dot open bracket 1 minus open paren the fraction with numerator cap P sub s and denominator cap P sub m end-fraction close paren raised to the the fraction with numerator k minus 1 and denominator k end-fraction power close bracket end-root ηneta sub n : Nozzle efficiency (typically 0.94 to 0.97) : Isentropic exponent (Specific heat ratio, : Specific gas constant ( Tmcap T sub m : Motive temperature (Kelvin) Critical Nozzle Throat Area ( Atcap A sub t For choked, supersonic flow (which occurs when