What is a refrigeration system that uses the evaporator of the first stage to exchange heat with the condenser of the second stage called?

The refrigeration system described is known as a cascade system. In this setup, two distinct refrigeration cycles work together, with the evaporator of the first stage absorbing heat from the environment and transferring that heat to the condenser of the second stage. This configuration is designed to achieve much lower temperatures than what a single-stage system could provide on its own.

The cascade system utilizes the strengths of two separate Refrigeration cycles, allowing each to operate optimally within its specific temperature range. The first stage typically deals with higher temperatures, while the second stage is engineered for much lower temperatures, making it effective for applications such as cryogenics or specialized industrial processes.

Choosing a cascade system over other types like a piggy-back, twin, or parallel systems is beneficial when significant temperature reductions are necessary, as it takes advantage of the thermal dynamics between the two stages for enhanced efficiency and performance.