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What (who) is waste heat - definition
Waste heat
![[[Air conditioning]] units extract [[heat]] from a dwelling interior with coolant, and transfer it to the dwelling exterior as waste. They emit additional heat in their use of [[electricity]] to power the devices that pass heat to and from the coolant](https://commons.wikimedia.org/wiki/Special:FilePath/2008-07-11 Air conditioners at UNC-CH.jpg?width=200 "[[Air conditioning]] units extract [[heat]] from a dwelling interior with coolant, and transfer it to the dwelling exterior as waste. They emit additional heat in their use of [[electricity]] to power the devices that pass heat to and from the coolant")
![A [[coal-fired power station]]. These transform chemical energy into 36%-48% electricity and the remaining 52%-64% to waste heat](https://commons.wikimedia.org/wiki/Special:FilePath/Coal power plant Datteln 2 Crop1.png?width=200 "A [[coal-fired power station]]. These transform chemical energy into 36%-48% electricity and the remaining 52%-64% to waste heat")
![[[Cooling tower]]s evaporating water at [[Ratcliffe-on-Soar Power Station]], [[United Kingdom]].](https://commons.wikimedia.org/wiki/Special:FilePath/RatcliffePowerPlantBlackAndWhite.jpg?width=200 "[[Cooling tower]]s evaporating water at [[Ratcliffe-on-Soar Power Station]], [[United Kingdom]].")
WASTE HEAT IS BY NECESSITY PRODUCED BOTH BY MACHINES THAT DO WORK AND IN OTHER PROCESSES THAT USE ENERGY, FOR EXAMPLE IN A REFRIGERATOR WARMING THE ROOM AIR OR A COMBUSTION ENGINE RELEASING HEAT INTO THE ENVIRONMENT.
Anthropogenic heat; User:CharlesRKiss/Anthropogenic Heat; Anthropogenic Heat; Secondary heat; Low-grade heat; Low grade heat; Reuse of waste heat; Electrification of waste heat
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 recovery unit
![gas-fired power station]] in California, is equipped with two heat recovery steam generators on its combustion turbines.](https://commons.wikimedia.org/wiki/Special:FilePath/Gateway Generating Station rectified.jpg?width=200 "gas-fired power station]] in California, is equipped with two heat recovery steam generators on its combustion turbines.")
ENERGY RECOVERY HEAT EXCHANGER
Waste heat recovery; Waste Heat Recovery Unit; Thermal Energy Recovery System
A waste heat recovery unit (WHRU) is an energy recovery heat exchanger that transfers heat from process outputs at high temperature to another part of the process for some purpose, usually increased efficiency. The WHRU is a tool involved in cogeneration.
Cyclone Waste Heat Engine
![Schematic [[indicator diagram]] of pressure in a steam engine cylinder. The pressure in the cylinder declines after cutoff as the steam pushes the piston down its bore.](https://commons.wikimedia.org/wiki/Special:FilePath/Indicator diagram steam admission.svg?width=200 "Schematic [[indicator diagram]] of pressure in a steam engine cylinder. The pressure in the cylinder declines after cutoff as the steam pushes the piston down its bore.")
The Cyclone Waste Heat Engine (WHE) is a small steam engine developed to produce power from steam created from waste heat. It is an offshoot of the development of the Cyclone Mark V Engine by the company Cyclone Power Technologies of Pompano Beach, Florida.
Examples of use of waste heat
1. Cogeneration is electricity production combined with utilization of waste heat.
2. Large scale means power plants that divert the waste heat they generate to local buildings.
3. By 2050, industry will be located in hubs, so the waste heat from one manufacturing process is used by another.
4. Two of the windows on the top right appear to have been left open, which can waste heat when the heating is on.
5. Two–thirds of the energy going in to the UK‘s centralised power stations is immediately lost in the form of waste heat.