Ejector Design Calculation Xls ✦ ❲RECENT❳
If you are developing a custom spreadsheet, ensure you cross-reference your formulas with the to maintain compliance with standard process engineering practices. If you'd like, let me know:
An Excel spreadsheet for ejector design is an invaluable tool for process and mechanical engineers, offering a powerful combination of theory, calculation speed, and flexibility. By mastering the 1-D thermodynamic model and implementing it in Excel, you can perform accurate preliminary designs, conduct sensitivity analyses, and optimize ejectors for a wide range of applications.
For complex iterations, Visual Basic for Applications (VBA) can significantly enhance your spreadsheet. VBA can automate the iterative process of finding the correct area ratio that matches your target entrainment ratio, or handle more advanced models like normal shock analysis in the diffuser. However, many 1-D models can converge using Excel's built-in iterative calculation feature (found in Options > Formulas) or by using Goal Seek.
Inputs (Excel input block)
), molecular weight, inlet pressure, inlet temperature, and heat capacity ratio.
An ejector relies on the Venturi effect to entrain a low-pressure suction fluid using a high-pressure motive fluid. It consists of three primary components:
A standard calculation sheet is generally organized into the following sections: Input Parameters Motive Fluid ejector design calculation xls
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) : Function of the motive mass flow rate, pressure, and molecular weight. Mixing Section Area ( A3cap A sub 3
Almost all spreadsheet-based ejector design calculations are founded on a . This model simplifies the complex, 3D, turbulent, and often supersonic flow inside an ejector into a set of algebraic equations. The "1-D" assumption means that flow properties (pressure, temperature, velocity) are considered uniform across any cross-section and only vary along the ejector's axis. If you are developing a custom spreadsheet, ensure
A diverging section that slows down the mixed fluid, converting kinetic energy back into static pressure higher than the suction pressure. 2. Essential Design Inputs for your XLS Tool
Create an Excel template with the following sections:
ERcorrected=ERactual×WMW×WTcap E cap R sub c o r r e c t e d end-sub equals cap E cap R sub a c t u a l end-sub cross cap W sub cap M cap W end-sub cross cap W sub cap T Step 2: Determine Motive Nozzle Dimensions For complex iterations, Visual Basic for Applications (VBA)
A simplified practical approach used in industry XLS templates: Use the by El-Dessouky (2002) for steam-jet ejectors: $$Er = 0.85 \times \left( \fracP_mP_s \right)^0.77 \times \left( \fracP_dP_s \right)^-1.13$$
The core performance parameter is the :
