A boiler generates 10 kg of dry steam per 2 kg of coal burned. The heating value of the coal is 21,000 kJ/kg. The boiler produces 1500 kPa steam from 60°C feedwater. Calculate the efficiency.

A boiler generates 10 kg of dry steam per 2 kg of coal burned. The heating value of the coal is 21,000 kJ/kg. The boiler produces 1500 kPa steam from 60°C feedwater. Calculate the efficiency.

A boiler generates 10 kg of dry steam per 2 kg of coal burned. The heating value of the coal is 21,000 kJ/kg. The boiler produces 1500 kPa steam from 60°C feedwater. Calculate the efficiency.



A. 57.3%

B. 92.3%

C. 60.5%

D. 74.7%

E. 85.0%


Answer: C


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