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Heat as an energy source may be classified under three major transfer systems.
Heat transfer occurs by contact between two bodies which are at different temperatures through a stationary medium without the transfer of material taking place between them.
Heat transfer by means of a transfer system which is characterised in the sense that heat is produced by the movement of a fluid (liquid or gas) which transports the thermal energy between different temperature zones.
Heat transfer by means of a radiation system is performed by electromagnetic waves. Unlike the previous two systems, there is no direct contact between bodies at different temperatures nor transport of intermediate fluids which release thermal energy.
Infrared radiation originates in the wavelengths of the electromagnetic spectrum further beyond than that of the red spectrum and is invisible to the human eye. Its use as a heat transfer medium is most similar to the effect of the sun's rays which are absorbed by the earth and living organisms.