Waste heat
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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.
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See also
- District heating
- Waste heat recovery unit
- Heat recovery steam generator
- Pinch analysis
- Relative cost of electricity generated by different sources
- Urban heat island
- Urban metabolism
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