Engineering · Diesel — Mean Effective Pressure
Brake horsepower differs from indicated horsepower by the amount of power lost to:
- ACombustion inefficiency
- BFriction and the driving of engine-mounted auxiliaries (mechanical losses)✓ Correct
- CExhaust heat
- DCooling water
Explanation
Indicated HP is developed inside the cylinders. Brake HP is the usable output at the coupling. The difference (mechanical losses from friction and driven auxiliaries) defines mechanical efficiency = BHP/IHP.
Authority: Modern Marine Engineer's Manual
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