Ejector Design Calculation Xls ~repack~ May 2026

Ejector Design Calculation XLS: A Comprehensive Guide An ejector design calculation XLS 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

Ejectors operate by converting the potential energy of a high-pressure motive fluid into kinetic energy through a nozzle, creating a low-pressure zone that entrains a secondary suction fluid.

Motive Nozzle (Converging-Diverging): Expands high-pressure motive fluid to supersonic speeds, dropping its pressure below that of the suction load.

Suction Chamber: The area where the high-velocity jet meets and pulls in the suction fluid.

Mixing Section (Throat): Where the two streams combine, equalizing their velocities through momentum transfer.

Diffuser: A diverging section that converts kinetic energy back into potential energy, raising the pressure of the combined mixture to the required discharge level. Core Formulas in an Ejector Calculation XLS

A robust Excel template typically incorporates the following fundamental equations: 1. Entrainment Ratio ( ejector design calculation xls

The most vital performance metric is the entrainment ratio, defined as the mass flow rate of entrained vapor ( ) divided by the mass flow rate of motive steam (

w=mempw equals the fraction with numerator m sub e and denominator m sub p end-fraction

For choked flow conditions (typically where the compression ratio is >1.8is greater than 1.8

), complex empirical correlations are often used in spreadsheets to predict this ratio based on expansion and compression factors. 2. Compression and Expansion Ratios Compression Ratio ( Crcap C sub r ): The ratio of discharge pressure ( Pccap P sub c ) to entrained vapor pressure ( Pecap P sub e Expansion Ratio ( Ercap E sub r ): The ratio of motive steam pressure ( Ppcap P sub p ) to entrained vapor pressure ( Pecap P sub e 3. Cross-Sectional Area Ratios Excel sheets calculate specific areas at critical points ( A1cap A sub 1 for nozzle throat, A2cap A sub 2 for nozzle outlet, and A3cap A sub 3 for ejector throat) using pressure-based correlations: EPJ Web of Conferenceshttps://www.epj-conferences.org Measurement and calculating of supersonic ejectors

3. Entrainment Ratio ($\omega$)

The core calculation. The sheet solves for the mass ratio of sucked fluid to motive fluid: $$\omega = \frac\dotm_s\dotm_m$$

Key Features & Capabilities

• Single-Stage Ejector Sizing: Calculates the dimensions of the nozzle, throat, and diffuser for a standard gas-gas ejector.
• Thermodynamic Modeling: Utilizes isentropic expansion and compression efficiency factors to predict real-world performance.
• Reverse Calculation Mode: Input your existing hardware dimensions to predict performance under new operating conditions.
• Multiple Fluid Support: Pre-loaded properties for Steam, Air, and generic Ideal Gases.
• Visual Outputs: Generates a performance curve (Entrainment Ratio vs. Compression Ratio) automatically.

Who Is This For?

1. Plant Engineers: Troubleshooting vacuum system issues or steam jet ejector performance in refineries and chemical plants.
2. HVAC Engineers: Designing ejector-based refrigeration or heat recovery systems.
3. Process Designers: Performing feasibility studies for gas compression without moving parts.
4. Students: Learning the principles of compressible flow and

To create a robust ejector design calculation spreadsheet, your content should focus on a one-dimensional (1D) analytical model that captures the thermodynamic behavior of fluid mixing. While full empirical performance often requires proprietary manufacturer data, you can build a highly accurate screening tool by following these structural and technical components. 1. Primary Inputs (User Entry Data) Ejector Design Calculation XLS: A Comprehensive Guide An

Your spreadsheet must first establish the operating environment: Motive Fluid (Primary): Pressure ( Ppcap P sub p ), Temperature ( Tpcap T sub p ), and Mass Flow Rate ( ṁpm dot sub p Suction Fluid (Secondary): Pressure ( Pscap P sub s ), Temperature ( Tscap T sub s ), and Molecular Weight ( MWcap M cap W Discharge Condition: Desired Discharge Pressure ( Pdcap P sub d Physical Constants: Isentropic exponent ( ) and Gas constant ( 2. Core Performance Indicators

Calculate these ratios to determine the ejector's theoretical feasibility: Steam jet Ejectors

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

Steam Ejector Calculation Notes: This is a widely used free spreadsheet on Cheresources based on semi-empirical equations for entrainment ratio. It uses curve-fitting constants for both choked and non-choked flow conditions.

Lempor Ejector Calculator: A specialized calculator for steam locomotive exhaust systems that simplifies complex fluid dynamics into a multi-sheet Excel workbook.

Scribd - Steam Ejector Calculations XLS: This document outlines the specific constants ( Who Is This For?

) 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

Ejector performance is typically calculated using the following variables: Entrainment Ratio (

): The mass flow rate of entrained vapor divided by the mass flow rate of motive steam. Compression Ratio ( ): The ratio of discharge pressure ( Pccap P sub c ) to entrained vapor pressure ( Pecap P sub e ). Choked flow is generally defined as Expansion Ratio ( ): The ratio of motive steam pressure ( Ppcap P sub p ) to entrained vapor pressure ( Pecap P sub e Geometry Sizing: Determining the nozzle throat area ( A1cap A sub 1 ), nozzle outlet area ( A2cap A sub 2 ), and diffuser cross-sections. Foundational Research Papers

If you are looking for the underlying theory to build your own model, the following papers are the industry standard:

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

"Estimation of ejector's main cross sections..." (Applied Thermal Engineering, 2004): Offers a step-by-step procedure for steam-ejector refrigeration systems.

Lempor Ejector Calculator Beta 1.1 | PDF | Steam Locomotive - Scribd

Building an Ejector Design Calculation XLS: Template Structure

A professional template will have six distinct worksheets: