// multi-utility computation suite · offline · instant · precise
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eng.air-compressor Calculator
Calculates air compressor power consumption, free air delivery (FAD), and compression ratio from inlet and outlet conditions. Air compressor efficiency at part load is poor — variable speed drive compressors reduce energy consumption by 35–50% compared to fixed-speed with unloading control.
Inputs
Flow Cfm
Reference formula or conversion factor shown for context.
Pressure
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Efficiency
Useful output divided by total input, as a percentage. 100% is impossible due to losses (heat, friction, resistance).
Duty Cycle
Fraction of each period the signal is active, as a percentage. 50% = symmetric square wave. Controls average power delivered.
Results
bhp required
Reference formula or conversion factor shown for context.
motor kW
Reference formula or conversion factor shown for context.
actual CFM capacity needed
Sample size or count used in the calculation.
compression ratio
The computed compression ratio or compressive force. Higher compression ratios store more energy but increase heat and pressure.
rule of thumb
A widely used practical approximation or heuristic for this field — useful for quick estimates but not a substitute for rigorous calculation.
BHP = Q*Pr/(229*eff)
Reference formula or conversion factor shown for context.