Efficiency in Pumps or Fans

Calculate hydraulic, mechanical, volumetric, and overall efficiency for pumps or fans, considering losses from friction, leakage, and mechanical components.

Calculator

Inputs

Specific Work (w) (J/kg)

Specific Work Loss - Hydraulic (wl) (J/kg)

Power from Motor to Shaft (P) (W)

Power Loss in Transmission (Pl) (W)

Volume Flow Out (q) (m³/s)

Leakage Volume Flow (ql) (m³/s)

Results

Hydraulic Efficiency (ηh)--

Mechanical Efficiency (ηm)--

Volumetric Efficiency (ηv)--

Overall Efficiency (η)--

Efficiency Type	Formula	Description
Hydraulic Efficiency (ηh)	w / (w + wl)	Accounts for friction, acceleration/retardation, and flow direction changes
Mechanical Efficiency (ηm)	(P - Pl) / P	Accounts for losses in transmission gears and bearings
Volumetric Efficiency (ηv)	q / (q + ql)	Accounts for fluid leakage between impeller and casing
Overall Efficiency (η)	ηh × ηm × ηv	Product of all three efficiency components