INTERNATIONAL MARITIME COLLEGE OMAN MO: Apply kinetic energy and potential energ

Question

INTERNATIONAL MARITIME COLLEGE OMAN MO: Apply kinetic energy and potential energy concepts for the special cases Create warm and harmony environment and develop the skills. Task:1 A certain Gasoline engine has an efficiency of 30%; that is it converts into useful work 30% of the heat generated by buning a fuel.I the engine consumes 0.80L/h of gasoline with a heating value of 3.5x10'kJ/L, how much power does it provides? Express the answer both in kW and horse power. I Richard, M. Felder and Ronald, W. Rousseau. (2000)

Explanation / Answer

Volumetric consumption of gasoline = 0.80 L/h

Energy content = 3.5 x 10^4 kJ/L

Useful work = 30% of heat generated

Efficiency = 30%

Power = Volumetric consumption x Energy content x efficiency

= 0.80 L/h x 3.5 x 10^4 kJ/L x 0.30

= 8400 kJ/h x 1h/3600s

= 2.3 kJ/s

= 2.3 kW

Power in hp = 2.3 kW x 1.3405 hp/kW = 3.13 hp

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