Ejector Design Calculation Xls Updated
): =SQRT((4 * Motive_Mass_Flow) / (PI() * Critical_Mass_Flux)) Calculated based on the total mass flow (
For steam ejectors, use empirical curve-fit (ESDU 85032):
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.
If you are building your workbook, let me know if you need help with , sizing multi-stage systems , or creating condenser balance equations . Share public link ejector design calculation xls
Quickly adjust motive pressure to see its impact on suction load.
If you are looking for ready-made templates, several online resources provide downloadable Scribd spreadsheets based on these principles. If you'd like, I can: for each cell. Explain how to use SOLVER to find the optimum P2cap P sub 2 Compare this analytical method with a graphical approach . Let me know how you'd like to proceed with the design . Share public link
Molecular weight, adiabatic index ( B. Fundamental Calculation Equations Share public link Quickly adjust motive pressure to
ER=Mass Flow of Suction Fluid (ms)Mass Flow of Motive Fluid (mm)cap E cap R equals the fraction with numerator Mass Flow of Suction Fluid open paren m sub s close paren and denominator Mass Flow of Motive Fluid open paren m sub m close paren end-fraction
Assuming typical steam ejector design with choked flow, the Excel formula for Aₜ would be:
By utilizing these resources, engineers can improve their knowledge and skills in ejector design calculation XLS and design and optimize ejectors with confidence. Explain how to use SOLVER to find the
Where: W_s = mass flow of suction fluid, W_m = mass flow of motive fluid
Steam jet ejectors are critical components in process industries, widely used to create vacuum conditions in distillation columns, evaporators, and condensers. Designing an efficient ejector requires precise mathematical modeling of fluid dynamics, thermodynamics, and gas laws.
| Section | Contents | Key Inputs/Outputs | | :--- | :--- | :--- | | | Motive & Suction Conditions | (P_0), (T_0), (P_s), (T_s), mass flow rates | | Gas Properties | Fluid Data | k, R, molecular weight | | Target Performance | Design Goals | Desired Er, Cr | | Nozzle Calculation | Motive Nozzle Sizing | Aₜ, Dₜ | | Mixing Section Calc | Mixing Diameter | Ar, A₂, D₂ | | Diffuser Calculation | Diffuser Sizing | Diffuser efficiency, discharge pressure | | Results Summary | Key Outputs | All dimensions, final performance predictions |
For applications requiring deeper vacuum (i.e., lower suction pressure), a single ejector stage may not suffice. In such cases, you will need to design a multi-stage system with two, three, or even more ejectors connected in series, often with inter-condensers between stages.