Any material that has a temperature above absolute zero gives off some radiant energy. Radiation heat transfer is mediated by electromagnetic radiation, known as thermal radiation, that arises due to the temperature of a body. In general, the radiation heat transfer from one surface to another is the radiation leaving the first surface for the other minus that arriving from the second surface. ![]() But a third type of heat transfer, radiation heat transfer, occurs without any medium at all. In preceding chapters, we have discussed convection and conduction, which require the presence of matter as a medium to carry the heat from the hotter to the colder region. In its core, the Sun fuses 620 million metric tons of hydrogen each second. Radiation Heat Transfer The Sun generates its energy by nuclear fusion of hydrogen nuclei into helium.
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