In a trial of single cylinder diesel engine the following observation were made: calorific value of fuel =43890 KJ/kg, Oil consumption = 10.2 kg/h, Speed=1900 rpm, Air consumption= 3.8 kg/min, compression ratio=15, Torque = 186 Nm, Quantity of cooling water used = 15.5 kg/min, Temp. Rise= 36oC, exhaust gas temp = 410oC, Room temp. = 20oC, Cp of exhaust gases = 1.17 KJ/kgK

Calculate: i) B.P. ii) BSFC iii) Heat Balance sheet on minute basis.

$$BP = \frac{{2\pi NT}}{{1000}} = \frac{{2\pi \times 1900 \times 186}}{{1000 \times 60}} = 37.01KW$$$$BSFC = \frac{{{m_f}}}{{BP}} = \frac{{10.2}}{{37.1}} = 0.2702Kg/KWhr$$ Heat balance sheet:

Heat supplied per minute $$ = \frac{{10.2 \times 43890}}{{60}} = 7461.3KJ/Min$$ Heat in BP: $$ = 37.01 \times 60 = 2220.6KJ/\min $$ Heat in cooling water: $$ …