Organize inputs by fluid stream. Use clear color coding (e.g., light blue for user entry, grey for system constants). Description Motive Pressure ( Pmcap P sub m Supply pressure at nozzle inlet Motive Temperature ( Tmcap T sub m Supply temperature Suction Fluid (Gas/Vapor) Suction Flow Rate ( Wscap W sub s Target capacity Suction Pressure ( Pscap P sub s Target vacuum level Suction Temperature ( Tscap T sub s Process gas temperature Average Molecular Weight Weighted average of gas mix Discharge Conditions Discharge Pressure ( Pdcap P sub d Downstream piping backpressure Tab 2: Thermodynamic Property Lookup
) to high-velocity, low-pressure gas, accelerating it to supersonic speeds. Where the suction gas ( Pscap P sub s ) is entrained by the motive jet.
A fixed XLS sheet structures these thermodynamic equations sequentially to eliminate manual iteration errors. Step 1: Determine the Entrainment Ratio (ER)
) does not exceed the "critical discharge pressure." If it does, the shockwave will move back into the throat, and the ejector will stop suctioning (breaking the vacuum). 4. Structuring Your XLS for Accuracy
To fix or build an XLS calculator, you must program the underlying thermodynamic equations. The calculation sequence follows mass, energy, and momentum balances. Entrainment Ratio ( The entrainment ratio dictates how much motive steam ( Wmcap W sub m ) is required to lift a specific amount of suction gas ( Wscap W sub s
A hidden or locked tab housing saturated and superheated steam properties using IAPWS-IF97 formulations.
Because the geometry is fixed, the ejector will only operate efficiently at its "design point." Deviating from these parameters can lead to "choking" or "back-firing." 2. Key Parameters for the XLS Calculation
Entrainment Ratio (R) = W_s / W_m
(choked flow assumption)
Ejector design calculation XLS fixed is a valuable tool for engineers and designers involved in the development of ejectors for various industrial applications. By following the steps outlined in this article, users can create a comprehensive ejector design, ensuring optimal performance, efficiency, and reliability. The example calculation demonstrates the effectiveness of the ejector design calculation XLS fixed process. By utilizing this method, engineers can reduce the complexity and time associated with ejector design, ultimately leading to improved project outcomes.
Note: Populate Column B with the corresponding values and formulas listed in the third column. Best Practices for Industrial Ejector Optimization