How do you calculate the system compression ratio?

The system compression ratio is an important concept in refrigeration and air conditioning, representing the efficiency and performance of the compressor. It is calculated by dividing the discharge pressure by the suction pressure (measured on a gauge). This method provides a straightforward numerical ratio that describes how much the refrigerant pressure increases as it moves through the compressor.

Using the discharge pressure and the suction pressure allows for an understanding of the pressures at which the system operates. The discharge pressure is the pressure at which the refrigerant exits the compressor, while the suction pressure is the pressure of the refrigerant entering the compressor. By comparing these two, the compression ratio can effectively indicate how much the refrigerant is being compressed.

In contrast, adding, multiplying, or subtracting these pressures does not yield a meaningful measure of the performance of the compressor. The compression ratio is fundamentally a ratio, and the division provides the necessary context for evaluating the efficiency and effectiveness of the system's compression process. Understanding this calculation can help technicians diagnose performance issues and optimize the operation of refrigeration systems.