Compressor Calculator

Calculate compressor displacement, mass flow rate, and efficiency for refrigeration systems.

Compressor Type

Bore (in)

Stroke (in)

Cylinders

Speed (RPM)

Clearance Volume (%)

Suction Pressure (psia)

Discharge Pressure (psia)

Suction Gas Specific Volume (ft3/lb)

Swept Displacement

CFM (cubic feet per minute)

Compression Ratio

Volumetric Efficiency

Actual Volume Flow

CFM

Mass Flow Rate

lb/min

Displacement (in3/rev)

Mass Flow (lb/hr)

Compressor Calculations

Displacement = pi/4 x Bore^2 x Stroke x Cylinders x RPM / 1728

Compression Ratio = P_discharge / P_suction

Vol. Eff. = 1 - C x [(P_d/P_s)^(1/n) - 1]

Mass Flow = Actual CFM / Specific Volume

where C = clearance ratio and n = polytropic exponent (~1.15 for refrigerants)

COP / EER.

Charge amounts.

Chiller tonnage.

Fan laws.

Steam properties.

Heat transfer.