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How System Pressures Affect Compressor Capacity
2017/08/08
August 7, 2017
The capacity of a compressor can be affected by a refrigeration system’s ever-changing pressures. In addition, suction pressure entering the compressor will change the density of the suction gasses within the compressor and affect its capacity. The temperature of the refrigerant entering the compressor’s cylinder also has an effect on capacity, but for this article, we’ll focus on pressures.

Compression ratios
 
Both the high- and low-side system pressures can be expressed as a ratio called a compression ratio. Compression ratio is defined as the absolute discharge pressure divided by the absolute suction pressure.
 
Compression Ratio = Absolute discharge pressure/Absolute suction pressure
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