Steam Boilers, Engines, Nozzles and Turbines
The ratio of the energy required to produce the artificial draught (expressed in meters head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

Efficiency of the chimney
Efficiency of the fan
Efficiency of the boiler
Power of the boiler

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Steam Boilers, Engines, Nozzles and Turbines
Boiler H.P. is defined as the

The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam
Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam
Steam evaporation rate per kg of fuel fired
Work done by 1 kg of steam at saturation condition

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