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
Approach temperature should be as low as possible
Handling and maintenance should be easier
Heat transfer area should be optimum

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Steam Boilers, Engines, Nozzles and Turbines
Pick up the correct statement as regards Cornish boiler and Lancashire boiler

Lancashire has two fire tubes and Cornish has one
Cornish has two fire tubes and Lancashire has one
Cornish is water tube and Lancashire is fire tube
Cornish is fire tube and Lancashire is water tube

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