Heat transfer in a furnace is a complex process that involves several methods to ensure efficient operation.
5 Key Methods of Heat Transfer in a Furnace
1. Radiation
Radiation occurs when the burners in the furnace are ignited.
The burners radiate heat to the fluid inside the tubes.
This initial heat source transfers heat through the process of radiation.
2. Convection
Convection requires the flow of a gas or liquid to carry heat.
In a furnace, there are tubes located above the heating chamber.
These tubes catch the heat as it leaves the chamber before it exits through the stack.
This process helps maintain the efficiency of the furnace by preventing wasted heat.
3. Conduction
Conduction is the transferring of heat through a solid surface.
Heat conduction happens in a furnace when heat is transferred to the tubes.
The tubes in the furnace are heated by direct radiation from the burner flame in the radiant section or firebox.
Above the firebox is the convection section where the tubes are heated by convection for additional heat recovery.
4. Heat Transfer Fluid
Heat can also be transferred in a furnace through feeding the furnace with a heat transfer fluid.
Inside an industrial furnace, there are series of tubes containing heat transfer fluid.
This fluid is heated and then circulated throughout the plant to provide heat to various equipment.
5. Design and Power Source
The design and power source of the furnace also play a role in how heat is transferred.
Furnaces can be powered by burning a fuel or by converting electricity to heat.
The most common type of furnace is fuel-powered due to the expense of electricity.
The design of the furnace can vary depending on the fuel used and the heat process.
Electric furnaces, for example, may use resistant or induction heating.
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