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During the trial of a single-acting oil engine, cylinder diameter 20 cm, stroke 28 cm, working on the two-stroke cycle and firing every cycle, the following observations were made:

Duration of trial = 1 hour

Total fuel used = 4.22 kg;

Calorific value = 44670 kJ/kg;

Proportion of hydrogen in fuel = 15%

Total number of revolutions = 21000

Mean effective pressure = 2.74 bar

Net brake load applied to a drum of 100cm diameter = 600N

Total mass of cooling water circulated      = 495 kg

Temperature of cooling water:

     Inlet 130 °C,  outlet 38°C

    Air used, 135 kg.

Temperature of air in test room, 20°C and Temperature of exhaust gases, 370°C

Assume:

CPgases = 1.005 kJ/kgK and CPsteam at atmospheric pressure = 2.093 kJ/kg K.

Calculate the thermal efficiency and draw up the heat balance.

                            

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