written 6.1 years ago by | • modified 5.1 years ago |
During an engine trial on a six cylinder four stroke diesel engine, cylinder bore 180 mm, the stroke 200 mm, the following observations were recorded : 1500 rpm, BP=245 kW , MEP=8 bar , fuel consumption : 70 Kg/hr , heating valve of fuel 44 MJ/Kg , Hydrogen content of the fuel 12%, air consumption 28 kg/min , mass of cooling water 85 kg/min, cooling water temperature rise 42 °C, cooling oil circulated through the engine = 50 Kg/min, temperature rise of cooling oil = 24°C ,specific heat of cooling oil 2.1 kJ/KgK, room temperature 30 °C, exhaust gas temperature 400°C, Cp of the dry exhaust gas 1.045 kJ/KgK,partial pressure of the steam in a exhaust gases 0.035 bar. Estimate the mechanical efficiency and draw heat balance sheet.