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 difference between Cornish boiler and Lancashire boiler is that

Former contains one fire tube and latter contains two fire tubes
None of the listed here
Former is fire tube type and latter is water tube type boiler
Former is water tube type and latter is fire tube type

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