Steam Boilers, Engines, Nozzles and Turbines
The function of injector used in small capacity boilers is to

Add make up water in the system
Create vacuum
Inject chemical solution in feed pump
Pump water, similar to boiler feed pump

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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
Product of thermal efficiency and Rankine efficiency
Ratio of thermal efficiency to the Rankine efficiency
Ratio of brake power to the indicated power

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