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 by 1 kg of steam at saturation condition
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

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Steam Boilers, Engines, Nozzles and Turbines
The indicated thermal efficiency is defined as the

Ratio of heat equivalent to indicated power to the energy supplied in steam
Ratio of brake power to the indicated power
Product of thermal efficiency and Rankine efficiency
Ratio of thermal efficiency to the Rankine efficiency

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