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
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If the discharge back-pressure exceeds the maximum compression capability calculated by the spreadsheet, the ejector will stall. A robust XLS template includes a safety margin calculation (typically 10-15% above design discharge pressure) to ensure the system remains stable during field pressure surges. ejector design calculation xls fixed
After scouring the internet, you finally stumble upon a reliable source that offers a fixed XLS file for ejector design calculations. The file seems to be comprehensive, covering various design parameters and calculations.
An ejector uses a high-pressure motive fluid to entrain and compress a low-pressure suction fluid. The process relies entirely on the conversion of pressure energy into kinetic energy, and back into pressure energy. Organize inputs by fluid stream
Many engineering spreadsheets found online are "broken" due to outdated visual basic macros, rigid unit conversions, or oversimplified gas behaviors. Here is how to fix them:
Do you require (bar, kg/h, °C) or US Customary units (psig, lb/h, °F)? Share public link A robust XLS template includes a safety margin
to a motive pressure entry will completely ruin the velocity formulas.
Calculations for the relationship between the nozzle and ejector throat to ensure the design meets suction requirements. Solver/Iteration: Tools like Excel Solver
: Calculate the ejector's performance parameters, including efficiency, using the entrainment ratio, compression ratio, and other design conditions.
Use =IF(Pm>Ps, LOG(Pm/Ps), 0) to prevent the sheet from breaking during zero-load initialization testing. Handling Circular References in Diffuser Sizing