how to find compressor efficiency and power?

Refrigeration Compressor Efficiency

1.Volumetric Efficiency

a) Actual volumetric Efficiency

b) Clearance volumetric efficiency,

2. Compression Efficiency (or Adiabatic Efficiency), 

Mass Flow Rate of Reciprocating Compressor

 

                m=(vdis/vsuc)  x ηv/100 kg/s

Compressor Power

P = m (delta hi) kW

where, delta hi = isentropic work done on compressor per unit mass