<P> Waste heat is heat that is produced by a machine, or other process that uses energy, as a byproduct of doing work . All such processes give off some waste heat as a fundamental result of the laws of thermodynamics . Waste heat has lower utility (or in thermodynamics lexicon a lower exergy or higher entropy) than the original energy source . Sources of waste heat include all manner of human activities, natural systems, and all organisms, for example, a refrigerator warms the room air, an internal combustion engine generates high - temperature exhaust gases, and electronic components get warm when in operation . </P> <P> Instead of being "wasted" by release into the ambient environment, sometimes waste heat (or cold) can be utilized by another process (such as using hot engine coolant to heat a vehicle), or a portion of heat that would otherwise be wasted can be reused in the same process if make - up heat is added to the system (as with heat recovery ventilation in a building). </P>

Example of where energy is wasted as heat
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