Furnace Technology
In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by

Radiation
Convection
Can not be predicted
Conduction

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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
Thermal conductivity of the charge & structural materials of furnace
Nature of process ; whether batch, continuous or intermittant

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