The wetted surface area of a container ship is 5946 m2. When travelling at its service speed, the effective power required is 11250 kW with frictional resistance 74% of the total resistance and specific fuel consumption of 0.22 kg/kWh. To conserve fuel, the ship speed is reduced by 10%. The daily fuel consumption is then found to be 83 tonne.
Frictional coefficient in sea water is 1.432. Speed in m/s with index (n) 1.825. Propulsive coefficient may be assumed constant at 0.6.
Determine:
a) the service speed of the ship
b) the percentage increase in specific fuel consumption when running at
reduced speed
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