Strahlungswärmeübertragung

Strahlungswärme, often translated as radiant heat, is a form of heat transfer that occurs through electromagnetic waves, primarily in the infrared spectrum. Unlike conduction and convection, which require a medium to transfer heat, radiation can travel through a vacuum, such as the space between the sun and the Earth. The energy is emitted by any object with a temperature above absolute zero. The intensity of the emitted radiation depends on the object's temperature and its emissivity, a measure of how effectively it radiates energy.

When these electromagnetic waves strike another object, they can be absorbed, reflected, or transmitted. Absorption of these waves leads to an increase in the internal energy of the absorbing object, thus increasing its temperature. This is the fundamental principle behind how the sun warms the Earth, or how a fireplace heats a room without direct contact. Common examples include the warmth felt from a campfire, the heat from a light bulb, or the surface of a hot pan. The efficiency of heat transfer by radiation is influenced by the properties of the emitting and absorbing surfaces, as well as the distance between them.