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In this introductory article, we will briefly discuss basic knowledge about thermal radiation and radiative heat transfer phenomena. A specific of presentation of this important and complex branch of science and engineering in the Thermopedia will be also characterized below.

First of all, one should remember the thermal radiation emitted by the sun and transferred through the space to our planet. The solar heat is a real source of life on the Earth. This heat cannot be transferred to the Earth by conduction and convection. The only mode of heat transfer responsible for this process is a radiation (electromagnetic waves) which can propagate in vacuum. Fortunately, the temperature of the sun surface layer is very high (about six thousand degrees). As a result, the main part of the radiation power is emitted in the visible spectral range and we can see the world around us. The great role of solar radiation in human life has been seen many centuries ago. It is sufficient to remember ...

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