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If the suction pressure in a compressor is 62 PSIG and the discharge pressure is 110 PSIG, what is the compression ratio?

Answer :

Final answer:

To find the compression ratio, convert gauge pressures to absolute by adding atmospheric pressure (14.7 PSI) to both suction and discharge pressures, then divide the discharge pressure by the suction pressure. The result is a compression ratio of approximately 1.63.

Explanation:

The compression ratio of a compressor is calculated by dividing the absolute discharge pressure by the absolute suction pressure. First, it is essential to convert the gauge pressure readings to absolute pressure. This is accomplished by adding the atmospheric pressure, which is approximately 14.7 PSI, to each gauge pressure.

Suction Pressure (absolute) = Suction Pressure (gauge) + Atmospheric Pressure
Suction Pressure (absolute) = 62 PSIG + 14.7 PSI = 76.7 PSIA

Discharge Pressure (absolute) = Discharge Pressure (gauge) + Atmospheric Pressure
Discharge Pressure (absolute) = 110 PSIG + 14.7 PSI = 124.7 PSIA

Finally, the compression ratio is:

Compression Ratio = Discharge Pressure (absolute) / Suction Pressure (absolute)
Compression Ratio = 124.7 PSIA / 76.7 PSIA ≈ 1.63

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