METHODS OF HEAT TRANSFER

Four methods by which heat may be transferred during a fire are:

1. Direct Burning

• Heat Comes in direct contact with combustible materials
• Direct contact causes ignition.

2. Conduction 

• Molecule to molecule transfer of heat through conducting solids such as metal beams or pipes.
• Heat is transfer to other parts of the building and can ignite combustible or flammable materials.

3. Convection

• Hot gases rise and become trapped beneath a ceiling or travel through voids and ducts to other parts of a building
• The hot gases ignite combustible or flammable materials.

4. Radiation

The heated materials in a fire will radiate heat (thermal radiation or infrared) which can be absorbed by surfaces near the seat of the fire and cause ignition of nearby fuel.

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