focus on vacuum systems for chemical processing, emphasizing steam quality and troubleshooting. Lempor Ejectors
Adjust your motive mass flow until the ER matches the required suction process capacity. Size the Nozzle Throat (
Calculate the basic dimensionless numbers: ejector design calculation xls
Using these formulas systematically inside Excel allows engineers to run rapid sensitivity analyses, plotting performance curves across varying motive pressures to find the perfect operational sweet spot.
Ejectors, also known as jet pumps or eductors, are simple devices that use a high-pressure fluid (motive fluid) to entrain, mix, and compress a secondary fluid (suction fluid), achieving a pumping effect without any moving parts. Because of their simplicity, reliability, and low cost, they are widely used in industrial processes for creating vacuum, pumping gases, and handling corrosive or hazardous materials. focus on vacuum systems for chemical processing, emphasizing
This yields: (A_t \approx 1.47 \times 10^-5 \text m^2)
Define your available motive pressure and the target process vacuum level. Ejectors, also known as jet pumps or eductors,
Comprehensive Guide to Steam Jet Ejector Design and Calculation
A complete Excel tool should include input parameters, calculated variables based on empirical correlations, and output geometries. A. Input Data Needed kPa (abs) Entrained Vapor Pressure ( Pecap P sub e ): kPa (abs) Discharge Pressure ( Pccap P sub c ): kPa (abs) Motive Temperature ( Tpcap T sub p ): K Entrained Temperature ( Tecap T sub e ): K
A robust Excel template typically follows these computational steps:
Since ejector design is coupled (geometry determines ṁ_s, and ṁ_s determines geometry), use or Solver :