heat
energy that is transferred from one body to another as the result of a difference in temperature
waste heat
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.
sensible heat
heat exchanged by a body or thermodynamic system
body heat
heat released from the bodies of animals, including humans, produced by physical and metabolic activity
decay heat
heat released as a result of radioactive decay
latent heat
released or absorbed energy during a constant-temperature process
geothermal heating
methods of heating and cooling a building using underground heat