Calculate power of motor required to drive a forced draught fan which maintains a draught of 45 mm of water the temperatures of flue gases leaving the boiler and air inside the boiler house are 300°C and 25°C respectively. It is given that the air supplied for complete combustion of 1 kg of fuel is 20 kg. 1800 kg of coal is burnt per hour. The efficiency of the fan is 80%. (Take Volume of air at N.T.P as 0.7734 m3)

Calculate power of motor required to drive a forced draught fan which

1.	Calculate power of motor required to drive a forced draught fan which maintains a draught of 45 mm of water the temperatures of flue gases leaving the boiler and air inside the boiler house are 300°C and 25°C respectively. It is given that the air supplied for complete combustion of 1 kg of fuel is 20 kg. 1800 kg of coal is burnt per hour. The efficiency of the fan is 80%. (Take Volume of air at N.T.P as 0.7734 m3)
A.	9.56 kW
B.	4.66 kW
C.	5.65 kW
D.	6.32 kW
Answer» C. 5.65 kW

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