Compare the thermal efficiency of two boilers for which the data is given below: Boiler 1 Boiler 2 Steam pressure 14 bar 14 bar Steam produced per kg of coal fired 10 kg 14 kg Quality of steam 9 dry superheated to 240°C Feed water temperature 27°C 27°C Calorific value of fuel 34000 kJ/kg 46000 kJ/kg Specific heat of feed water is 4.18 kJ/kg K and specific heat of steam is 2.1 kJ/kg K. Which boiler is more efficient?

 

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