Question

Q2: A two-stroke diesel engine was electrically motored (non-firing operation) when the meter reading was 1.5 kW. Then the test on the engine was carried out for firing operation and the following observations were recorded: brake torque = 120 N.m; speed = 600 rpm. (i) Determine the brake power ($b.p$), the indicated power ($i.p$), and mechanical efficiency ($\eta_m$). (ii) Draw up the heat balance sheet on percentage basis, if the fuel used = 2.5 kg/hr; calorific value of fuel = 40.3 MJ/kg; cooling water used = 818 kg/hr; rise in temperature of cooling water = 10°C; exhaust gas temperature = 345°C; room temperature = 25°C; AFR = 32:1. Take $C_{p_w}$ = 4.2 kJ/kg.K and $C_{p_{exh}}$ = 1.05 kJ/kg.K. Assume $\eta_{comb}$ = 98%. [20 Marks]

          Q2: A two-stroke diesel engine was electrically motored (non-firing operation) when the meter
reading was 1.5 kW. Then the test on the engine was carried out for firing operation and the
following observations were recorded: brake torque = 120 N.m; speed = 600 rpm. (i) Determine
the brake power ($b.p$), the indicated power ($i.p$), and mechanical efficiency ($\eta_m$). (ii) Draw up
the heat balance sheet on percentage basis, if the fuel used = 2.5 kg/hr; calorific value of fuel = 
40.3 MJ/kg; cooling water used = 818 kg/hr; rise in temperature of cooling water = 10°C;
exhaust gas temperature = 345°C; room temperature = 25°C; AFR = 32:1. Take
$C_{p_w}$ = 4.2 kJ/kg.K and $C_{p_{exh}}$ = 1.05 kJ/kg.K. Assume $\eta_{comb}$ = 98%.
[20 Marks]

Q2: A two-stroke diesel engine was electrically motored (non-firing operation) when the meter
reading was 1.5 kW. Then the test on the engine was carried out for firing operation and the
following observations were recorded: brake torque = 120 N.m; speed = 600 rpm. (i) Determine
the brake power (b.p), the indicated power (i.p), and mechanical efficiency (). (ii) Draw up
the heat balance sheet on percentage basis, if the fuel used = 2.5 kg/hr; calorific value of fuel =
40.3 MJ/kg; cooling water used = 818 kg/hr; rise in temperature of cooling water = 10°C;
exhaust gas temperature = 345°C; room temperature = 25°C; AFR = 32:1. Take
Cpw = 4.2 kJ/kg.K and Cpexh = 1.05 kJ/kg.K. Assume ηcomb = 98%.
[20 Marks]

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