Ejector Design Calculation Xls Fixed Jun 2026

Build verification checks directly into the sheet using conditional formatting (e.g., highlighting cells red if the calculated Mach number exceeds structural limits).

The entrainment ratio (ω = secondary flow / motive flow) is the heart of the design. In unstable spreadsheets, a 5% change in backpressure results in a 500% calculation error. Fixed XLS tools use validated curves from ASME PTC 37 or ESDU 86030, locked to prevent accidental scaling.

Input parameters are critical for accurate output. The Excel sheet should include: Pressure ( Ppcap P sub p ), Temperature ( Tpcap T sub p ), Molecular Weight ( MWpcap M cap W sub p ), Specific Heat Ratio ( γpgamma sub p Suction Fluid Properties: Pressure ( Pscap P sub s ), Temperature ( Tscap T sub s ), Molecular Weight ( MWscap M cap W sub s ), Specific Heat Ratio ( γsgamma sub s Discharge Pressure ( Pccap P sub c ): The required discharge pressure. Flow Rates: Required suction vapor mass flow rate ( B. Calculation Engine (The "Fixed" Equations) ejector design calculation xls fixed

A spreadsheet implementation typically solves a quasi-one-dimensional model, such as the one described by Keenan et al. (1950) and ESDU 86030, which balances energy and momentum across the ejector. This model is the basis for two primary ejector designs modeled in engineering software:

To ensure your spreadsheet works reliably for field engineering: Build verification checks directly into the sheet using

| Source | Key Feature | Common Fix Needed | |--------|-------------|--------------------| | (jet pump calculator) | Good for liquids | Add gas compressibility | | Chemical Engineering Site (gas ejector.xls) | Includes shock analysis | Enable iterations, fix circular refs | | PD-Help (educ. version) | Steam ejector focus | Add steam table lookup |

Often includes a lookup table for Steam Chest and Diffuser materials (e.g., Carbon Steel, 316L SS, or Graphite). 6. User Instructions Enter the process conditions in the yellow-shaded cells Review the Compression Ratio Fixed XLS tools use validated curves from ASME

, where the geometry is optimized for a specific design point (MDP - Motive Design Pressure). It utilizes high-velocity steam (motive fluid) to entrain and compress a lower-pressure gas (suction fluid). 2. Input Parameters (Data Entry)

Some of the key calculations you can perform with this XLS file include:

w=A⋅ErB⋅PeCD⋅H+I⋅Pp⋅G⋅PcJw equals the fraction with numerator cap A center dot cap E r to the cap B-th power center dot cap P sub e to the cap C-th power and denominator cap D center dot cap H plus cap I center dot cap P sub p center dot cap G center dot cap P sub c to the cap J-th power end-fraction (Constants

Calculates the length and exit diameter required to convert kinetic energy back into static pressure ( cap P sub d 4. Technical Specifications & Formulas The XLS uses the following primary governing equations: Mass Balance: Velocity of Steam: is nozzle efficiency). Motive Flow: 5. Features of the "Fixed" XLS Version Performance Curves: