Furnace Technology
Means for giving direction to the circulation of gases in furnaces are

Fans
Location of outlet ports and heating & combustion devices
Arrangement of heating stock in the furnaces
All of these

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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

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

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