In a properly functioning system, which temperature is commonly expected at the evaporator outlet?

In a properly functioning refrigeration or air conditioning system, the temperature at the evaporator outlet is typically representative of the state of the refrigerant as it absorbs heat from the surrounding environment. The correct answer aligns with the understanding that the evaporator functions to remove heat and facilitate the phase change of the refrigerant from a liquid to a vapor.

When refrigerant exits the evaporator, it is designed to have absorbed heat, causing it to vaporize. This process means the temperature at the evaporator outlet is generally above the freezing point, because if it were at freezing or below, there would be a risk of ice formation, leading to decreased efficiency and potential issues in the heat exchange process.

In refrigeration systems, particularly those that are working effectively, the outlet temperature should ideally be at a level that ensures the refrigerant is in a vapor state after it has absorbed thermal energy from the space being cooled. Thus, the temperature measured at the outlet is more aligned with the principles of superheat rather than freezing temperatures. This maintains optimal performance and prevents ice build-up, ensuring the system operates as designed.

The other options, while relevant in different contexts within the refrigerant cycle, do not accurately represent the expected outlet condition of the evaporator.