What is the refrigeration cycle's first stage called?

The first stage of the refrigeration cycle is evaporation. In this stage, the refrigerant, which is usually in a low-pressure liquid state, enters the evaporator coil. Here, it absorbs heat from the inside of the refrigerator or conditioned space, causing the refrigerant to change from a liquid to a vapor as it evaporates. This heat absorption is crucial because it lowers the temperature within the refrigerated space, thereby cooling it.

The evaporation process is fundamental to how refrigeration systems provide cooling. When the refrigerant evaporates, it creates a cooling effect, enabling the system to draw heat away from the environment that is being cooled. This is why understanding the evaporation stage is critical for anyone working with refrigeration systems. Each stage of the cycle plays a specific role, and evaporation is where the cooling process effectively starts.