A boiler plant consisting of an evaporator and superheater produces steam at a rate of 4 000 kg every hour at pressure and temperature of 1 650 kPa and 230 C respectively. The steam leaves the evaporator dry saturated. Feedwater temperature at the evaporator entry is 49,5 C. Coal with a calorific value of 32 MJ/kg is supplied to the boiler at a rate of 400 kg/h. Fuel gases are generated at a rate of 18,6 kg for each kilogram of coal burnt and leave the plant at 350 C. The ambient temperature is 30 C. The engine driven by the steam produced has brake power of 277 kW. Superheated steam and flue gases have specific heat capacity of 2,3 kJ/kg.K and 0,86 kJ/kg.K respectively. Use steam tables to calculate: 4.2.1 The equivalent evaporation of the entire plant (4) 4.2.2 The thermal efficiency of the entire plant (3) 4.2.3 The energy lost with the flue gases per kilogram of fuel burnt (3) 4.2.4 The percentage brake thermal efficiency of the engine (3) 4.2.5 The energy lost with radiation per kilogram of fuel by using the energy balance method