waste heat; remaining heat
Refers to heat that is generated as a byproduct and not used for work, often in industrial, engineering, or environmental contexts.
Technology to reuse waste heat from factories is attracting attention.
There is a plan to use waste heat from data centers to provide local heating.
Standard kanji form for waste heat, especially in technical and environmental contexts.
Alternate kanji form; 排 emphasizes 'exhaust' or 'discharge' of heat, while 廃 emphasizes 'discarded' or 'waste' heat. Both are used.
Compound of 廃 (hai, 'discard') or 排 (hai, 'exhaust') and 熱 (netsu, 'heat'). The exact historical derivation is uncertain; both kanji forms are used in modern technical writing.