2. A six-cylinder, four-stroke cycle, marine oil engine has cylinder dia- meters of 610 mm and...

 

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2. A six-cylinder, four-stroke cycle, marine oil engine has cylinder dia- meters of 610 mm and a piston stroke of 1250 mm. When the engine speed is 2 rev/s it uses 340 kg of fuel oil of calorific value 44200 kJ/kg in one hour. The cooling water amounts to 19200 kg/h, entering at 15°C and leaving at 63°C. The torque transmitted at the engine coupling is 108 kN m and the indicated mean effective pressure is 775 kN/m². Determine: (a) the indicated power; (b) the brake power; (c) the percentage of the energy supplid/kg of fuel lost to the cooling water; (d) the brake thermal efficiency; (e) the brake mean effective pressure; (f) the mechanical efficiency: (g) the brake specific fuel consumption. 2. A six-cylinder, four-stroke cycle, marine oil engine has cylinder dia- meters of 610 mm and a piston stroke of 1250 mm. When the engine speed is 2 rev/s it uses 340 kg of fuel oil of calorific value 44200 kJ/kg in one hour. The cooling water amounts to 19200 kg/h, entering at 15°C and leaving at 63°C. The torque transmitted at the engine coupling is 108 kN m and the indicated mean effective pressure is 775 kN/m². Determine: (a) the indicated power; (b) the brake power; (c) the percentage of the energy supplid/kg of fuel lost to the cooling water; (d) the brake thermal efficiency; (e) the brake mean effective pressure; (f) the mechanical efficiency: (g) the brake specific fuel consumption.

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