Ejector Design Calculation Xls Fixed May 2026

If you’d like, I can:

Use the empirical Ejector Ratio (R) from standard curves. For a fixed spreadsheet, use this polynomial (for air/steam, single stage):

Entrainment Ratio (R) = W_s / W_m

Estimate R using:
= MAX(0.1, 2.5 * (P_s / P_d)^0.85) (conservative approximation) ejector design calculation xls fixed

Then:
W_m = W_s / R (kg/h)

When engineers refer to an "XLS Fixed Design," they usually refer to one of two scenarios. It is crucial to distinguish which mode your spreadsheet operates in:

Scenario A: The "Design Mode" (Calculating Dimensions) In this mode, the user inputs the performance requirements as Fixed Inputs: If you’d like, I can:

Scenario B: The "Rating Mode" (Calculating Performance) In this mode, the geometry is Fixed:

Most generalized ejector XLS sheets are built for Design Mode (Scenario A).

✅ Iterative calculation enabled
✅ All pressures absolute
✅ Choking check displayed
✅ No #DIV/0! or #NUM! in main outputs
✅ Entrainment ratio between 0.1 and 5 (typical range)
✅ Discharge pressure > suction pressure but < motive pressure
✅ One sample validation case documented Use the empirical Ejector Ratio (R) from standard curves

If your ejector spreadsheet still fails after these fixes, consider rebuilding it from a reference design method (e.g., ASME PTC 12.2 for steam ejectors). Excel is a tool – but the physics of choking, shocks, and mixing must be respected first.

In a fixed spreadsheet, avoid =ITERATION or circular references. Use these direct formulas.