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

From heating an intermediate material and then heating the air from this material
By direct mixing
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 proximate analysis of fuel lists

Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight
Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

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