noun
residual heat; waste heat
Refers to heat that remains after a process or is released as a byproduct. Used in technical, engineering, and everyday contexts.
エンジンを止めた後も、しばらくは余熱で暖かい。
Even after turning off the engine, it stays warm for a while from residual heat.
工場では余熱を利用して発電している。
The factory uses waste heat to generate electricity.