Computer Modeling of Single -Screw Oil Flooded Refrigerant Compressors

A computer model of an oil-flooded single-screw refrigerant compressor operating at 100% capacity and at matched discharge pressures was developed which predicts internal conditions using empirically determined values. The model gives detailed thermodynamic information concerning the internal processes. It calculates the total required shaft power, the refrigerant preheat and compression powers, and the oil shear displacement powers. It also calculates the contributions to volumetric inefficiency from preheat, recirculating oil and refrigerant leakage. Finally, it predicts the isentropic and volumetric efficiencies of the machine. The results of the computer model are compared with available data and the effect of oil and refrigerant leakage on the computer performance is shown.