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This yields: (A_t \approx 1.47 \times 10^-5 \text m^2)
An embedded XY Scatter chart plotting the . This helps visualize the ejector's behavior under off-design operating conditions. 5. Critical Engineering Pitfalls to Avoid in Excel
Mastering Ejector Design Calculations: A Comprehensive Guide and Spreadsheet Walkthrough ejector design calculation xls
Highlight input cells in a distinct color (e.g., light yellow).
While specialized software (like Aspen EDR or HYSYS) exists, Excel offers:
If you are programming the Excel sheet manually without proprietary charts (like the HEI Standards), you can use the for gas/steam ejectors: Determine Ideal Expansion Velocity ( Vmcap V sub m ): Here is comprehensive content designed for a landing
The sheet instantly shows if the ejector is feasible in a single stage or needs multiple stages.
) flows through the nozzle, converting pressure into kinetic energy (supersonic velocity). Low-pressure vapor ( Pecap P sub e ) is sucked into the mixing zone. Discharge Fluid: Combined fluids ( Pccap P sub c ) are diffused to a higher pressure. The entrainment ratio ( ) is defined as the mass flow rate of the entrained vapor ( ) divided by the mass flow rate of the motive steam (
, the flow is supersonic, and you must use convergent-divergent nozzle equations. ) flows through the nozzle, converting pressure into
The core performance parameters are:
This is often sized based on a specific velocity (Mach 1) at the mix pressure. A common heuristic formula used in XLS sheets for steam: $$D_t \approx \sqrtd_t^2 \times \left( \fracP_mP_s \right)^0.5 + \textSuction Area Factor$$ (For exact calculation, you must determine the specific volume of the mixture at the diffuser throat).
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
Iteration and optimization
This is the engine of the spreadsheet.