Which of the following indicates a properly functioning condenser?

A properly functioning condenser is indicated when de-superheating occurs after condensation. In a refrigeration cycle, the refrigerant absorbs heat and changes from a liquid to a gas, which is referred to as superheating. After this phase, when the refrigerant reaches the condenser, it undergoes a condensation process where it releases heat and transforms back into a liquid state.

De-superheating refers to the process where the refrigerant cools down from its superheated state to the saturation point, and this must happen before it fully condenses into a liquid. If this de-superheating occurs after condensation, it suggests that the condenser is effectively reducing the temperature of the refrigerant after it has turned back into a liquid, indicating efficient operation of the condenser.

In contrast, the other scenarios would not exemplify a proper functioning condenser. Sub-cooling is a process that occurs after condensation, whereas superheating would occur before the refrigerant enters the condenser. If condensation occurs without any de-superheating, it suggests that the refrigerant may not be effectively releasing heat, pointing to a malfunctioning or underperforming condenser.