What is the position of the suction and discharge valves during the re-expansion portion of the compression cycle?

During the re-expansion portion of the compression cycle in a refrigeration system, both the suction and discharge valves are closed. This phase is crucial as it allows the refrigerant to expand and reduce its pressure without exchanging heat with the surroundings.

When both valves are closed, the refrigerant trapped in the compressor is allowed to expand. This expansion leads to a drop in temperature and pressure of the refrigerant, enabling it to absorb heat from the environment when it is eventually released through the evaporator.

This creates an essential part of the refrigeration process, as the appropriate management of the pressure and temperature is vital for efficient cooling. By ensuring that both valves remain closed, the process maintains control over the refrigerant's flow and the thermodynamic principles governing the cycle.

In summary, during the re-expansion phase, keeping both valves closed facilitates the necessary conditions for the refrigerant to expand and lower in temperature, ensuring the effectiveness of the refrigeration cycle.