Ejector Design Calculation Xls [cracked] -

Where $V_2$ is velocity at end of throat (subsonic after shock). Your XLS must solve for $V_2$ iteratively.

Find the pressure ratio across the motive nozzle ( ) to confirm choked flow conditions.

If you are building your workbook, let me know if you need help with , sizing multi-stage systems , or creating condenser balance equations . Share public link

| Sheet Name | Content | |------------|---------| | | Operating fluids, pressures, temperatures, mass flow rates | | Fluid Properties | Gas constant, specific heat ratio, saturation tables (if steam) | | Nozzle Calc | Motive nozzle throat & exit diameters, Mach number | | Suction Calc | Suction mass flow capacity | | Mixing & Shock | Momentum balance, shock Mach, pressure rise | | Diffuser | Final discharge pressure, efficiency | | Results | Entrainment ratio, area ratio, performance curves | | Charts | ω vs. compression ratio, parametric sweeps |

Before opening Excel, you must understand the three critical sections of an ejector: ejector design calculation xls

Color-code these cells (e.g., light blue) so users know where to input data. Pressure ( Pmcap P sub m ), Temperature ( Tmcap T sub m ), Molecular Weight ( Mmcap M sub m ), Specific Heat Ratio ( Suction Fluid Properties: Pressure ( Pscap P sub s ), Temperature ( Tscap T sub s ), Molecular Weight ( Mscap M sub s ), Desired Flow Rate ( ṁsm dot sub s Discharge Properties: Required Discharge Pressure ( Pdcap P sub d Block 2: Constants & Fluid Properties Reference Universal Gas Constant ( Efficiencies: Nozzle efficiency ( ), Mixing efficiency ( ), Diffuser efficiency ( Block 3: Verification & Intermediate Calculations

To build a robust Microsoft Excel workbook for ejector calculations, you must implement fundamental fluid mechanics equations. All formulas below assume an ideal gas behavior for compressible gas ejectors. Motive Gas Velocity and Mass Flow Rate

The distance between the nozzle exit and the mixing chamber inlet, with an optimal ratio between 0.25 to 1.5 3. Implementation in Excel (XLS) An effective spreadsheet should follow this logical flow: Ejector Motive Steam Consumption - Constant Contact

) used to calculate mass flow rates of motive steam versus entrained vapor, along with area ratios for the nozzle throat and outlet. Key Design Parameters Where $V_2$ is velocity at end of throat

A professional engineering calculation sheet must be transparent, auditable, and structured logically. Organize your into four core tabs or visual blocks. Block 1: Input Parameters (User Inputs)

Ejector design, jet pump, Excel calculation, entrainment ratio, area ratio, gas ejector, steam ejector.

The ratio of the mixing chamber diameter to the nozzle diameter typically ranges between for optimal performance. Nozzle Position ( cap L sub g a p end-sub

: Uses logarithmic correlations involving and with a separate set of constants. Geometric Dimensioning : Nozzle Throat Area ( A1cap A sub 1 If you are building your workbook, let me

is a calibration constant typically ranging between 0.5 and 0.8, depending on the geometric profile).

If the discharge backpressure rises above the design limit, the ejector will "break" operation, causing massive loss of vacuum.

For , several specialized Excel spreadsheets and research papers provide the necessary thermodynamic correlations for entrainment ratios and nozzle sizing. Notable Ejector Design Resources

To begin an XLS calculation, you must define the following operating conditions: Pressure ( Pmcap P sub m ), Temperature ( Tmcap T sub m ), and Molecular Weight ( MWmcap M cap W sub m Suction Fluid: Pressure ( Pscap P sub s ), Temperature ( Tscap T sub s ), and Molecular Weight ( MWscap M cap W sub s Discharge: Required Discharge Pressure ( Pdcap P sub d 2. The Calculation Process