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

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

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Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²
Conversion into steam at atmospheric condition
And its corresponding conversion into dry steam at desired boiler pressure
Conversion into steam at the same pressure at which feed water is supplied

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