Furnace Technology
Advantages of use of preheated combustion air are

All of these
Saving in fuel consumption
Increase in flame temperature
Reduction in scale losses

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Furnace Technology
In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Rate of firing and emissivity of flame
All of these
Nature of process ; whether batch, continuous or intermittant
Thermal conductivity of the charge & structural materials of furnace

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