The compressor is the core equipment of a vapor compression system

which significantly affects the energy consumption and stability of the system. An experimental system was built for the vapor compression system driven by the roots compressor

in which the evaporation temperature

evaporation pressure

compressor pressure

and evaporation capacity were 80–100 °C

46.60–101.64 kPa

17.86–36.03 kPa and 125.72–424.85 kg/h

respecitvely. The suction flow rate

compression specific power

volumetric efficiency

and isentropic efficiency of the root water vapor compressor with varying evaporation temperatures were studied experimentally. The results show that the suction flow rate (7.10–11.74 m3/min) gradually increased

and the compression specific power (310.69–158.54 kJ/kg) gradually decreased with the increase in evaporation temperature. Both the volumetric efficiency (52.21%–71.54%) and isentropic efficiency (16.48%–36.15%) increased with the increase in evaporation temperature. Increasing the frequency can enhance the efficiency of the compressor

and the measured volumetric efficiency and compression specific power were consistent with the data in previous studies. There was a difference between the experimental and theoretical values of the volumetric efficiency and the isentropic efficiency of the compressor

but this difference decreased with an increase in the evaporation temperature

and the root water vapor compressor was more stable and highly efficient in the range of evaporation temperature of 90–100 °C.