Ejector Design Calculation Xls !!install!! «95% Direct»

Rm=ṁsṁmcap R m equals the fraction with numerator m dot sub s and denominator m dot sub m end-fraction Critical Flow Through the Motive Nozzle (Choked Flow)

This section executes the geometric sizing formulas based on the calculated mass flows. Nozzle Throat Diameter ( Dtcap D sub t

Often incorporates logarithmic terms of the pressure ratios to account for subsonic behavior. Geometric Parameters (Area Ratios) : Calculates cross-sectional areas for: Nozzle Throat ( cap A sub 1 Where motive fluid reaches sonic speed. Nozzle Outlet ( cap A sub 2 Optimized for the expansion to suction pressure. Ejector Throat/Mixing Tube ( cap A sub 3 Where motive and suction fluids combine. Specialized Calculators Steam Jet Ejectors : Professional sheets like those from Graham Corporation

In this post, we’ll cover:

At=mmPmR⋅Tmγm⋅Mm(2γm+1)γm+1γm−1cap A sub t equals the fraction with numerator m sub m and denominator cap P sub m end-fraction the square root of the fraction with numerator cap R center dot cap T sub m and denominator gamma sub m center dot cap M sub m open paren the fraction with numerator 2 and denominator gamma sub m plus 1 end-fraction close paren raised to the the fraction with numerator gamma sub m plus 1 and denominator gamma sub m minus 1 end-fraction power end-fraction end-root = Universal gas constant γmgamma sub m = Isentropic exponent (Specific heat ratio) Step 3: Mixing Section and Throat Sizing

Cells calculating pressure recovery and final discharge geometry. Tab 4: Performance Curves

This gives near-CFD accuracy without leaving the spreadsheet environment. ejector design calculation xls

by Hisham Al Dessouky et al. ( Chemical Engineering & Processing , 2002): Provides the empirical constants used in most modern spreadsheets.

Uses a linear or polynomial correlation with specific constants (labeled A through J). Non-Choked Flow (

Motive Fluid (High Pressure) │ ▼ ┌───────────────┐ ───────┘ Motiv Nozzle └──────────────┐ Suction ├──────► Discharge (Mixed Fluid) Fluid ┌───────────────┐ │ ───────┐└───────────────┘ Diffuser │ └──────────────────────────────┘ An ejector consists of three primary mechanical sections: Rm=ṁsṁmcap R m equals the fraction with numerator

Based on one-dimensional compressible flow with normal shock in the mixing section:

To build an Excel calculation sheet, you must program the fundamental thermodynamic relationships governing gas and liquid behavior. Mass Balance

A detailed ejector calculation XLS typically includes the following logical sheets or sections: Operating Conditions Input : Users define the Motive fluid pressure ( cap P sub p ), Suction/Entrained fluid pressure ( cap P sub e ), and Discharge/Condenser pressure ( cap P sub c Compression & Expansion Ratios Compression Ratio ( cap C sub r The ratio of discharge pressure to suction pressure ( Expansion Ratio ( cap E sub r The ratio of motive pressure to suction pressure ( Entrainment Ratio ( Nozzle Outlet ( cap A sub 2 Optimized