How is the compressor ratio determined?

The correct method to determine the compressor ratio involves dividing the discharge pressure by the suction pressure, making the fourth choice the right one, not the first one. The compressor ratio is a critical parameter in refrigeration and HVAC systems as it indicates the increase in pressure from the suction side to the discharge side of the compressor.

In this correct formulation, the discharge pressure (measured in PSIA) represents the pressure at which refrigerant is expelled from the compressor, while the suction pressure (also measured in PSIA) is where the refrigerant enters. By taking the discharge pressure and dividing it by the suction pressure, you ascertain how much the refrigerant pressure has been increased as it moves through the compressor.

Understanding the compressor ratio helps in evaluating the performance of the compressor, assessing the efficiency of the system, and determining if the compressor is operating within its designed parameters.