The benefits of multistage compression. Limits
Theory of refrigerating machines - Mechanical compression machines. Multistage cycles

In a refrigeration machine or heat pump, the temperatures of the cold source q_F and the hot source q_C are far apart:

• or because, at approximately constant condensation temperature q_C, evaporation temperature q_F decreases (refrigeration machine for low-temperature cold production, freezing);

• or because, at approximately constant evaporation temperature q_F, condensation temperature q_C rises (heat pump for high-temperature heat production);

The compression ratio τ = p_C/p_F (pressure ratio) imposed on the compressor then rises because :

• if q_F decreases, p_F decreases;

• if q_C increases, p_C increases.

Increasing the compression ratio τ is accompanied...