Typically, how much superheat is found on the outlet of an evaporator under normal load conditions using the overfeed design?

In an overfeed evaporator design, the process typically aims to ensure that the refrigerant fully evaporates inside the evaporator before it exits to the compressor. Under normal load conditions, the ideal situation is to have no superheat at the outlet of the evaporator—meaning that the refrigerant leaves in a saturated state with no additional temperature rise above the saturation temperature. This scenario helps to maximize the efficiency of the system and reduces the risk of compressor damage due to the introduction of liquid refrigerant.

Having a superheat of 0ºF indicates that the refrigerant is at its boiling point at the outlet, which is what is desired with an overfeed design. Any superheat beyond this point would suggest that the refrigerant has absorbed more heat than necessary, which could indicate inefficiencies or operational issues in the system. Therefore, under normal operating conditions, the correct answer reflects the best practice for maintaining optimal functionality in an overfeed evaporator system.