Steam Boilers, Engines, Nozzles and Turbines
The temperature of flue gases at air heater outlet should be

Above dew point temperature of flue gases
Less than wet bulb temperature of flue gases
Below dew point temperature of flue gases
100°C

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Steam Boilers, Engines, Nozzles and Turbines
The power of a boiler may be defined as

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
The ratio of heat actually used in producing the steam to the heat liberated in the furnace

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