Ejector Design Calculation Xls !full! ●

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

Wm=Cd⋅At⋅Pm⋅kR⋅Tm⋅(2k+1)k+1k−1cap W sub m equals cap C sub d center dot cap A sub t center dot cap P sub m center dot the square root of the fraction with numerator k and denominator cap R center dot cap T sub m end-fraction center dot open paren the fraction with numerator 2 and denominator k plus 1 end-fraction close paren raised to the the fraction with numerator k plus 1 and denominator k minus 1 end-fraction power end-root Cdcap C sub d is the discharge coefficient (typically between Entrainment Ratio (ER)

Where the two streams combine, equalizing their velocities through momentum transfer. ejector design calculation xls

The most widely cited paper for steam ejector design calculations is: Evaluation of Steam Ejectors

w=mempw equals the fraction with numerator m sub e and denominator m sub p end-fraction The most widely cited paper for steam ejector

Slowly expands the flow area, converting the kinetic energy of the mixed stream back into static pressure (discharge pressure). 2. Key Mathematical Formulations for Ejector Design

A proper XLS tool must first define the process conditions for both the Motive Fluid (driving force) and the Suction Fluid (entrained load). Motive Pressure ( cap P sub p ) & Temperature ( cap T sub p Typically high-pressure steam. Suction Pressure ( cap P sub e ) & Temperature ( cap T sub s The required vacuum level. Discharge Pressure ( cap P sub c The pressure at the outlet, often directed to a condenser. Entrainment Ratio ( Ratio of suction mass flow ( ) to motive mass flow ( ScienceDirect.com 2. Core Calculation Steps Motive Pressure ( cap P sub p )

The best source for free, community‑validated engineering spreadsheets is . It hosts several highly regarded files:

to size components for vacuum generation or fluid compression. While specific proprietary spreadsheets are often held by manufacturers like Graham Corporation Croll Reynolds

To design an ejector calculation spreadsheet, you must model the three primary components: the , the suction/mixing chamber , and the diffuser . The core goal is to determine the Entrainment Ratio ( ) —the ratio of entrained vapor to motive steam mass flow. 1. Key Design Inputs

A3A1=0.32×Pc1.11×Pp-1.13×wthe fraction with numerator cap A sub 3 and denominator cap A sub 1 end-fraction equals 0.32 cross cap P sub c to the 1.11 power cross cap P sub p to the negative 1.13 power cross w Once the area ratio is found, the diameters of the nozzle throat ( ) and ejector throat ( ) can be computed using standard nozzle flow equations. 4. Key Performance Factors for Optimization