Steam Boilers, Engines, Nozzles and Turbines
The diagram factor is the ratio of the

Area of the actual indicator diagram to the area of theoretical indicator diagram
Actual workdone per stroke to the theoretical workdone per stroke
Actual mean effective pressure to the theoretical mean effective pressure
Any one of the above

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation of a boiler is a measure to compare

Any type of boilers operating under any conditions
The given boiler with the model
The two different boilers of the same make
Two different makes of boilers operating under the same operating conditions

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