Ejector Design — Calculation Xls Best

Successful spreadsheet automation requires defining the following variables based on established research Definition Motive Pressure cap P sub p Pressure of the high-pressure motive steam. Suction Pressure cap P sub e Pressure of the entrained vapor/gas. Discharge Pressure cap P sub c Pressure of the mixture exiting the diffuser. Entrainment Ratio Mass flow of entrained vapor per unit mass of motive steam. Compression Ratio Ratio of discharge pressure to suction pressure ( Expansion Ratio Ratio of motive pressure to suction pressure ( 2. Core Design Calculations 2.1 Entrainment Ratio ( ) for Choked Flow When the compression ratio is greater than

You would then use your target Er to back-calculate the required Ar.

Ejector Design Calculation XLS: A Comprehensive Guide An is a critical tool for engineers specializing in vacuum systems, thermocompressors, or jet pumps. These spreadsheets automate the complex thermodynamic and fluid dynamic equations required to size components such as the motive nozzle, mixing chamber, and diffuser. Key Design Principles of Ejectors

The pressure recovery in the diffuser depends on the efficiency of the shockwave conversion from supersonic to subsonic speed: ejector design calculation xls

Download this article as a PDF, open a blank Excel workbook, and begin coding the momentum balance in Section 3. Your first working ejector XLS will be the most enlightening spreadsheet you have ever built.

| Parameter | Literature | Excel XLS | Error | |-----------|------------|-----------|-------| | Entrainment ratio | 0.85 | 0.83 | -2.4% | | Optimum area ratio | 12.4 | 12.8 | +3.2% | | Critical back pressure | 0.32 bar | 0.315 bar | -1.6% |

Adjust the diffuser throat diameter ( Dtcap D sub t Entrainment Ratio Mass flow of entrained vapor per

The efficiency of an ejector is captured through specific formulas integrated into the XLS cells:

Converts high-pressure energy into kinetic energy (high velocity). Suction Chamber: Where the suction fluid enters.

We need to find the Mass Flow Ratio ($\mu = M_s / M_m$). Ejector Design Calculation XLS: A Comprehensive Guide An

PmPs≥(γ+12)γγ−1the fraction with numerator cap P sub m and denominator cap P sub s end-fraction is greater than or equal to open paren the fraction with numerator gamma plus 1 and denominator 2 end-fraction close paren raised to the the fraction with numerator gamma and denominator gamma minus 1 end-fraction power

Wm⋅vm+Ws⋅vs=(Wm+Ws)⋅vmixcap W sub m center dot v sub m plus cap W sub s center dot v sub s equals open paren cap W sub m plus cap W sub s close paren center dot v sub m i x end-sub 3. Step-by-Step Spreadsheet Architecture

A community forum where chemical engineers often share free Excel spreadsheets for process equipment sizing, including ejectors.

Using the choked flow equation from Section 2.1 and solving for (A_t):