Calculate Brake Power (BP) & Indicated Power (IP) with mechanical efficiency analysis
0 hp
0 hp
Friction Loss: 0 kW
BP = (2 × π × N × T) / 60,000 (for kW)
BP = (2 × 3.1416 × 3000 × 150) / 60,000 = 47.12 kW
IP = (Pₘ × L × A × N × n) / (60 × stroke_factor)
IP = (10 × 0.09 × 0.005027 × 3000 × 4) / (60 × 2) = 45.24 kW
η = (BP / IP) × 100%
η = (47.12 / 45.24) × 100% = 104.2%
Brake Power (BP) is the actual power available at the crankshaft for useful work.
Indicated Power (IP) is the theoretical power developed inside the engine cylinders.
The difference between IP and BP represents power lost to friction and other mechanical inefficiencies.
Mechanical efficiency is calculated as:
η = (BP / IP) × 100%
Typical values range from 75-90% for naturally aspirated engines, and can be higher for modern turbocharged engines.
Efficiencies over 100% usually indicate measurement errors or unrealistic input values.
BMEP (Brake Mean Effective Pressure) - Average pressure that would produce the measured brake power.
IMEP (Indicated Mean Effective Pressure) - Average pressure that would produce the indicated power.
SFC (Specific Fuel Consumption) - Fuel efficiency of the engine in g/kWh.
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