Ejector — Design Calculation Xls

A robust spreadsheet typically follows these sequential calculations: Key Formula/Logic Compression Ratio ( CRcap C cap R ) Assess performance feasibility 2 Expansion Ratio ( ERcap E cap R ) Determine motive energy 3 Entrainment Ratio ( ) Calculate suction capacity (Use semi-empirical constants A–H) 4 Nozzle Sizing Find throat ( A1cap A sub 1 ) & outlet area ( A2cap A sub 2 and isentropic expansion 5 Mixing & Diffuser Find mixing diameter ( A3cap A sub 3 Function of combined mass flow and Pccap P sub c 3. Critical Formulas for Excel Use these semi-empirical equations (valid for ) in your cells: Entrainment Ratio ( ): Constants (approximate): Nozzle Throat Area ( A1cap A sub 1 ): 4. Implementation Resources

Ejector Geometry:

Ejectors (also known as jet pumps, eductors, or siphon pumps) are simple yet highly efficient devices that use the Venturi effect to transport fluids, gases, or slurries. Unlike mechanical pumps, ejectors have no moving parts, making them ideal for harsh environments, high-temperature applications, and explosive atmospheres. However, designing an ejector is a delicate balance of fluid dynamics, thermodynamics, and empirical correction factors. ejector design calculation xls

Add a Monte Carlo simulation using =NORM.INV(RAND(), mean, stdev) on input parameters (e.g., pressure transmitters have ±1% error). Calculate the 90% confidence interval for actual ṁ_s. Unlike mechanical pumps, ejectors have no moving parts,

Successful spreadsheet automation requires defining the following variables based on established research Definition Motive Pressure cap P sub p Pressure of the high-pressure motive steam. Suction Pressure cap P sub e Pressure of the entrained vapor/gas. Discharge Pressure cap P sub c Pressure of the mixture exiting the diffuser. Entrainment Ratio Mass flow of entrained vapor per unit mass of motive steam. Compression Ratio Ratio of discharge pressure to suction pressure ( Expansion Ratio Ratio of motive pressure to suction pressure ( 2. Core Design Calculations 2.1 Entrainment Ratio ( ) for Choked Flow When the compression ratio is greater than Calculate the 90% confidence interval for actual ṁ_s

Implemented via iterative Goal Seek or explicit solve.