In a system using an automatic expansion valve, constant pressure is maintained at which point?

In a system utilizing an automatic expansion valve, constant pressure is maintained at the evaporator outlet. This is crucial for the correct function of the refrigeration cycle. The expansion valve's primary role is to allow refrigerant to enter the evaporator at a controlled rate, ensuring that the pressure within the evaporator remains constant.

Maintaining consistent pressure at this point is vital because it allows for optimal heat absorption from the environment, which is necessary for effective cooling. If the pressure were to fluctuate at the evaporator outlet, it could lead to issues such as inadequate refrigerant flow, reduced system efficiency, and potential damage to the equipment.

In contrast, the other points listed do not maintain constant pressure in the same manner. The compressor inlet sees varying pressures as refrigerant is drawn in and compressed; the condenser outlet will have pressure changes based on the condensation process; and the expansion valve inlet would not have a constant pressure due to the effects of the expansion valve regulating flow. Therefore, understanding the role of the automatic expansion valve is key to grasping why constant pressure is specifically associated with the evaporator outlet.