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Which method of heat transfer is most important in structural fires?
Wiki User
∙ 11y ago
It depends upon the fire, but "convection" is important in almost all fires. Convection moves the heat of the fire vertically until it hits a barrier (ceiling) and then moves the heat along that surface "in search" of an opening above or to another room. As heat and smoke build up at the ceiling, they also superheat the ceiling, and the heat continues to spread throughout the room (including radiation).
For purpose of fire-rated structures, "conduction" also plays a role, as things attached to the opposite side of a wall can ignite from conduction, if there is enough heat. Also, "radiation" is extremely important where flames and hot gases are large enough to radiate massive amounts of heat for hundreds of feet, perhaps igniting other structures or other nearby fuels.
As for firefighters attempting to FIND and put out a fire, radiation (the feel of the heat) is an important issue, where there is zero visibility in thick, black smoke. The radiation penetrates the firefighter's face-piece, allowing him or her to approximate the direction to the source of the most intense heat and direct the hose stream in that direction.
Wiki User
∙ 11y ago
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