The Canot cycle helps you to understand the 2nd law of thermodynamics.

Here we will deal with the Carnot Cycle including the following theme:

• Carnot Cycle: https://thermodynamics-engineer.com/carnot-cycle-2/
• Reversed Carnot Cycle: https://thermodynamics-engineer.com/429-2/
• Carnot Principles: https://thermodynamics-engineer.com/carnot-principals/

The Carnot cycle deals with a reversible heat engine, while reversed Carnot cycle the reversible refrigarator. After knowing the Carnot cycle and reversed Carnot cycle, we can prove the two statements of Carnot principles:

1. The efficiencies of all reversible heat engines operating between a constant temperature source (T_H) and a constant temperature sink (T_L) are the same. They only depend on the high temperature T_H=const and the low temperature T_L=const.

2. Between the same two reservoirs, the efficiency of a reversible heat engine is always greater than the efficiency of an irreversible one.