Ejector design calculation spreadsheets typically include automated formulas to determine the entrainment ratio compression ratio physical dimensions
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For those who need even more functionality, several standalone ejector software packages exist. is a notable example used by SpaceX, Hatch, Veolia and other major engineering firms. It can perform rigorous steam and gas ejector design calculations based on fundamental thermodynamic principles and has been extensively validated against actual installations. Other commercial options include the IHS ESDU Ejectors and Jet Pumps program (94046 for steam/gas, 93022 for liquid flow), which can optimise the primary nozzle and exit dimensions, as well as predict flow conditions throughout the ejector.
It is defined as: ER = Mass flow of entrained (suction) fluid / Mass flow of motive fluid
The following are the key parameters typically calculated using an ejector design calculation XLS: ejector design calculation xls
Find the pressure ratio across the motive nozzle ( ) to confirm choked flow conditions.
= Isentropic expansion coefficient (approx. 1.3 for superheated steam) = Molecular weight ( = Universal gas constant ( Tmcap T sub m = Motive steam temperature ( Diffuser Pressure Recovery
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To build an accurate calculation spreadsheet, you must define the operational parameters of your system. Organize your Excel sheet to capture these primary inputs: Motive Fluid Properties Motive steam pressure ( Pmcap P sub m , bar a or psia) Motive steam temperature ( Tmcap T sub m , °C or °F) or dryness fraction Motive steam mass flow rate ( , kg/h or lb/h) — if predetermined Suction Fluid Properties Suction pressure ( Pscap P sub s , bar a or Torr) Suction temperature ( Tscap T sub s , °C or °F) Total suction gas mass flow rate ( Average molecular weight of suction gas ( MWscap M cap W sub s Specific heat ratio of suction gas ( Discharge Conditions Discharge/Back pressure ( Pdcap P sub d , bar a or mmHg) 3. Step-by-Step Ejector Design Calculations It can perform rigorous steam and gas ejector
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 velocity of the motive fluid leaving a converging-diverging nozzle throat is governed by the isentropic expansion relationship:
👉 – includes sample data and validation against published case studies.
Look-up tables for steam, air, or specific hydrocarbons to automate enthalpy and entropy calculations. = Isentropic expansion coefficient (approx
A well-structured ejector design XLS typically follows these steps:
To optimize the design, your should allow for changes in:
These are typically derived from curve-fitting manufacturer data. For example, are common in steam applications. Coefficient of Determination ( cap R squared Well-tuned spreadsheets should aim for an to ensure accuracy. 2.2 Nozzle and Mixing Chamber Geometry Nozzle Throat Diameter ( cap D sub t h end-sub