A petrol engine develops 50 kW brake power. The fuel and air-flow rates are 10 kg and 107 kg/h. The.

A petrol engine develops 50 kW brake power. The fuel and air-flow rates are 10 kg and 107 kg/h. The temperature of fuel-air mixture entering the engine is 20°C and temperature of gases leaving the engine is 500°C. The heat transfer rate from the engine to the jacket cooling water is 50 kJ/s and that to the surroundings is 10 kJ/s.

Evaluate the increase in the specific enthalpy of the mixture as it flows through the engine.