TRANSFER OF THE HEAT

TRANSFER OF THE HEAT

Heat transfer can be effected in three different ways, by conduction,convection and or radiation.

The propagation of heat by conduction occurs between two bodies placed in contact, without a transfer medium established between them.

When the transfer of heat is effected trought a medium (like air), we speak of propagation of heat by convection.

Heat is propagated by radiation when it is transmitted from a heat source in from of electromagnetic waves, known as infra-red waves.

Infra-red waves are not visible because they have a longer wavelength than visible light.

Infra-red heaters for extrusion cylinders and injection presses, plates for thermoforming machines as well as for a variety of other applications, are based on the principle of radiation heating with electromagnetic waves.

These heaters consist of a double-walled, insulated stainless steel casing, inside of which are arranged a variable number of quartz tubes wiyh internal heating spirals. When both ends of the spirals receive a voltage, the Joules effect causes them to become incandescent and emit radiation in the low to medium infra-red spectrum.