However, pre-made or self-built ejector spreadsheets often break due to formula errors, missing physical properties, or broken iteration loops. This article explains the key calculation steps and how to .
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While a spreadsheet can calculate "best" diameters for fixed inputs, actual performance is often represented by curves that show how a fixed-geometry ejector responds to changes in discharge pressure or input flow. Practical Resources Spreadsheet Models: ejector design calculation xls fixed
To build or use an effective calculation sheet, you must account for several critical variables: 1. Suction Conditions (The "Load") You need to define what you are pulling. This includes: Usually expressed in kg/hr or lb/hr. Suction Pressure: The vacuum level required.
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) is calculated using the critical flow equation for compressible fluids:
Er=PpPecap E r equals the fraction with numerator cap P sub p and denominator cap P sub e end-fraction Ppcap P sub p = Pressure of motive steam ( kPak cap P a Pecap P sub e = Pressure of entrained vapor ( kPak cap P a Suction Pressure: The vacuum level required
Mass flow or target capacity, Pressure ( Pmcap P sub m ), Temperature ( Tmcap T sub m ), Molecular Weight ( MWmcap M cap W sub m ), and Specific Heat Ratio ( Suction Fluid Properties: Entrainment mass flow ( ), Pressure ( Pscap P sub s ), Temperature ( Tscap T sub s ), Molecular Weight ( MWscap M cap W sub s ), and Specific Heat Ratio ( Discharge Requirements: Required discharge pressure ( Pdcap P sub d
What are the (e.g., steam, air, natural gas, or liquid)?