Steam Boilers, Engines, Nozzles and Turbines
Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value

1 + moisture content
1 – moisture content
(1 + moisture content)
(1- moisture content)

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

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

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