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Here are some examples of heat energy. 1  The biggest example of heat energy in our solar system is the sun itself. 2  The sun radiates heat to warm us up one the planet earth. 3  When the burner of a stovetop is very hot, it is a source of heat energy.
The decay of the short-lived radioisotopes created in fission continues at high power, for a time after shut down. The major source of heat production in a newly shut down reactor is due to the beta decay of new radioactive elements recently produced from fission fragments in the fission process.