Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation is defined as

The ratio of heat actually used in producing the steam to the heat liberated in the furnace
The amount of water evaporated from and at 100°C into dry and saturated steam
The amount of water evaporated or steam produced in kg per kg of fuel burnt
The evaporation of 15.653 kg of water per hour from and at 100°C

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

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

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