Ejector Design Calculation Xls [hot] Link

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

Steam jet ejectors are reliable, static pieces of equipment used extensively in the chemical process industries to create vacuum conditions. Because they have no moving parts, they offer low maintenance costs and high reliability. Designing an ejector requires balancing complex fluid dynamics, gas laws, and compressible flow equations. 1. Anatomy of a Jet Ejector

⚠️ Excel is ideal for preliminary/sizing calculations. For detailed mechanical design or two-phase flow, use validated commercial tools.

To make the calculation tool user-friendly, audit-proof, and professional, organize it across four dedicated tabs: Tab 1: Cover & Documentation Project Name, Tag Number, Date, and Engineer Name. Revision history log. Brief instructions on how to use the spreadsheet. Tab 2: User Inputs (Data Entry) ejector design calculation xls

Best for (e.g., steam jet vacuum systems). Assumes mixing occurs at constant pressure (ideal for supersonic motive flow).

the design with velocity checks (sonic at the nozzle throat). Conclusion

Use the law of conservation of momentum within the mixing chamber to find the velocity of the mixed stream: To build an accurate calculation spreadsheet, you must

Derived from the combined mass flow of motive and entrained fluids. Available XLS and Software Resources

Calculate the nozzle throat area: [ A_t = \frac\dotm_1\rho_1 \cdot v_t ] where ( v_t ) is critical (sonic) velocity if the pressure ratio exceeds the critical pressure ratio.

The diffuser converts velocity head back to pressure. Efficiency ($\eta_d$) typically 70-85%: Because they have no moving parts, they offer

Look-up tables for steam, air, or specific hydrocarbons to automate enthalpy and entropy calculations.

This gives near-CFD accuracy without leaving the spreadsheet environment.

Standard machined stainless steel nozzles typically exhibit an efficiency ( ηneta sub n

A document that outlines the structure of a widely used Excel sheet for entrainment and area ratios.

For compressible fluids: [ A_t = \fracW_motiveP_1 \cdot \sqrt\frac\gammaR_gas T_1 \cdot \left(\frac2\gamma+1\right)^\frac\gamma+1\gamma-1 ] (Implemented as Excel formula with named constants)