Calculation Xls | Agitator Design

Streamlining Process Engineering: The Power of Agitator Design Calculation in Excel (XLS)

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3. Power Number & Motor Power Calculation

This is the heart of the spreadsheet. The XLS looks up the Power Number (Np) based on impeller type and NRe. For a Rushton turbine in turbulent flow, Np ≈ 5–6. agitator design calculation xls

Here is a sample agitator design calculation XLS template: Tank Diameter ($T$): Internal diameter of the vessel

3.1 Vessel Geometry

• Tank Diameter ($T$): Internal diameter of the vessel.
• Liquid Height ($H$): Height of the liquid level.
• Baffles: Number (typically 4), Width ($T/10$ to $T/12$).

To perform agitator design calculation, several parameters must be considered, including: Select an impeller type (e.g.

cap T equals the fraction with numerator cap P and denominator 2 pi center dot cap N end-fraction Design Torque ( cap T sub d

Sheet 2: Engine (Hidden Calculations)

1. Convert Units: Convert rpm to rps ($N = N_rpm/60$) and cP to Pa·s.
2. Lookups: Use VLOOKUP on the Impeller Type to retrieve the correct Power Number ($N_p$).
3. Calculate: Compute $N_Re$, Power ($P$), Torque ($\tau$), and Diameter ($d$).
4. Logic Check: Use an IF statement to flag if $N_Re$ is too low (< 2000) indicating the design correlations may not apply.

Select an impeller type (e.g., turbine, propeller, or paddle) and its sweep diameter ( ), often using the "1/3 rule" ( 2. Calculate the Reynolds Number ( cap N sub cap R e end-sub