Heat Engine

Definition: Heat Engine

A heat engine is a device which absorbs heat $Q_{\text{H}}$, converts part of it into work $W$ and releases the rest again as heat $Q_{\text{C}}$.

Definition: Hot Reservoir

The hot reservoir is the place where the heat $Q_{\text{H}}$ is coming from.

Definition: Cold Reservoir

The cold reservoir is the place where the hear $Q_{\text{C}}$ goes.