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Heat transfer by natural, upward flow of hot air from the device being cooled.



Related Terms

HEATING COIL

Heat transfer device consisting of a coil of piping, which releases heat.

HEAT PUMP

A heat transfer device that uses the heat rejected by a refrigeration process to provide heat. A combined cooling and heating unit.

COOLING-POWER ANEMOMETER

Any anemometer operating on the principle that the heat transfer to air from an object at an elevated temperature is a function of airspeed.

FIN

An extended surface to increase the heat transfer area, as metal sheets attached to tubes.

CONVECTION

The transfer of heat or mass by large-scale fluid movements. When the process occurs, due to density and temperature differences, it is termed natural convection. When the process occurs due to external devices (such as fans), it is termed forced convection.

BOILER CONVECTION SECTION

The part of a furnace between the radiant section and the stack. The area is filled with tubes or pipes which carry process steam and which absorb heat via convection heat transfer from the hot gases passing through the area on their way out of the stack. The convection section forms an obstacle to the combustion gas flow and can greatly affect furnace draft in the radiant section of the furnace.

VELOCITY THERMOCOUPLE

(suction pyrometer) a device for measuring furnace gas temperature. It is comprised of a thermocouple, which has been recessed into an insulating shroud, and a suction device such as an eductor, which aspirates large volumes of furnace gas through the shroud and past the thermocouple. The high velocity of a gas ensures good convective heat transfer to the thermocouple and surrounding furnace. The velocity thermocouple represents the most accurate means to measure flue gas temperature. Bare thermocouples are unacceptable for this purpose, being in error often by more than 100o F due to radiation losses.

PURGE INTERLOCK

A device so arranged that an air flow to the furnace above a minimum must exist for a definite time interval before the interlocking system will permit an automatic ignition torch to be placed in operation.

CONDUCTION

The transfer of heat by molecular collision. This process is more efficient in metals and other thermal conductors and poorer in fluids and insulators such as refractory.

AIR HEATER

Heat-transfer apparatus through which air is passed and heated by a medium of higher temperature, such as the products of combustion or steam.

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