A four-cylinder, four-stroke diesel engine is used to generate an output of 200A at 210v. The...
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A four-cylinder, four-stroke diesel engine is used to generate an output of 200A at 210v. The generator and mechanical efficiencies are 90 % and 87 %, respectively. The quantity of fuel supplied to the engine is 10 kg/h with a mass analysis of 86.2 % carbon and 13.8 % hydrogen. The molecular weight of the fuel is 167 g/mol. Assume that the products of combustion are CO, H20 and N2 with 20 % excess air. The specific gravity of the fuel used is 0.84 and the formula for the higher heating value from the Bureau of Standard is: HHV = 22,230 - 3,780(S.G.^2) BTUA6. The jacket cooling water for the diesel electric power plant flows at 0.25 kg/s which is first used to lower the temperature of the lubrication oil through an indirect oil cooler. The jacket cooling water enters the oil cooler at 29 C and leaves at 32 C in which it will be then used to cool the diesel engine. The jacket cooling water leaves the engine at 60 C. The exhaust gas temperature is 300 C and about 1.2 kg of steam is formed per kg of fuel. The exhaust gas is composed of steam and dry gas with specific heats of 2.1 kJ/Kg-K and 1.02 kJ/Kg-K, respectively. The ambient temperature is 28 C. Make an energy balance sheet expressed in kW. A four-cylinder, four-stroke diesel engine is used to generate an output of 200A at 210v. The generator and mechanical efficiencies are 90 % and 87 %, respectively. The quantity of fuel supplied to the engine is 10 kg/h with a mass analysis of 86.2 % carbon and 13.8 % hydrogen. The molecular weight of the fuel is 167 g/mol. Assume that the products of combustion are CO, H20 and N2 with 20 % excess air. The specific gravity of the fuel used is 0.84 and the formula for the higher heating value from the Bureau of Standard is: HHV = 22,230 - 3,780(S.G.^2) BTUA6. The jacket cooling water for the diesel electric power plant flows at 0.25 kg/s which is first used to lower the temperature of the lubrication oil through an indirect oil cooler. The jacket cooling water enters the oil cooler at 29 C and leaves at 32 C in which it will be then used to cool the diesel engine. The jacket cooling water leaves the engine at 60 C. The exhaust gas temperature is 300 C and about 1.2 kg of steam is formed per kg of fuel. The exhaust gas is composed of steam and dry gas with specific heats of 2.1 kJ/Kg-K and 1.02 kJ/Kg-K, respectively. The ambient temperature is 28 C. Make an energy balance sheet expressed in kW.
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Related Book For
Thermodynamics An Engineering Approach
ISBN: 978-0073398174
8th edition
Authors: Yunus A. Cengel, Michael A. Boles
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