Furnace should be designed so that in a given time, as much of material as possible can
be heated to an uniform temperature as possible with the least possible fuel and labour.
To achieve this end, the following parameters can be considered.
• Determination of the quantity of heat to be imparted to the material or charge.
• Liberation of sufficient heat within the furnace to heat the stock and overcome all
heat losses.
• Transfer of available part of that heat from the furnace gases to the surface of the
heating stock.
• Equalisation of the temperature within the stock.
• Reduction of heat losses from the furnace to the minimum possible extent.
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