Steam Boilers, Engines, Nozzles and Turbines
In regenerative air preheaters, the heat is transferred

By direct mixing
From heating an intermediate material and then heating the air from this material
Heat is transferred by bleeding some gas from furnace
From a metal wall from one medium to another

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Steam Boilers, Engines, Nozzles and Turbines
The theoretical indicator diagram of a simple steam engine is based upon the assumption that

Steam is admitted at boiler pressure and exhausted at condenser pressure
There is no pressure drop due to condensation
The expansion (or compression) of the steam is hyperbolic
All of these

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