Steam Boilers, Engines, Nozzles and Turbines
In designing air preheaters, the important design consideration is that

Stack gases should not be cooled to the dew point
Handling and maintenance should be easier
Heat transfer area should be optimum
Approach temperature should be as low as possible

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Steam Boilers, Engines, Nozzles and Turbines
A regenerative steam cycle renders

Decreased work output per unit mass of steam as well as increased thermal efficiency
Increased work output per unit mass of steam
Decreased work output per unit mass of steam
Increased thermal efficiency

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