A refrigeration system comprising: a compressor having a suction port and a discharge port , the compressor configured to receive refrigerant from the suction port , compress the refrigerant, and discharge the compressed refrigerant through the discharge port ; a condenser connected to the discharge port and configured to receive the compressed refrigerant from the compressor and condense the compressed refrigerant; an expansion device connected to the condenser and configured to receive the condensed refrigerant from the condenser ; a shell-and-tube style evaporator having an inlet port, a first outlet port , and a second outlet port , wherein the shell-and-tube style evaporator is configured to receive refrigerant from the expansion device through the inlet port, evaporate a portion of the refrigerant, and discharge the evaporated portion of the refrigerant through the first outlet port to the suction port , the second outlet port being in fluid flow communication with a location in the shell-and-tube style evaporator to which lubricant migrates during operation of the refrigeration system , the migrated lubricant mixing with liquid refrigerant in the shell-and-tube style evaporator to form a lubricant-liquid refrigerant mixture; characterized in that the system further comprises, a heat sink ; and a lubricant return line connecting the second outlet port to the suction port , wherein the lubricant return line is in heat exchange relationship with the heat sink such that heat is rejected from the heat sink to the lubricant-liquid refrigerant mixture to cool the heat sink and to evaporate the liquid refrigerant in the lubricant-liquid refrigerant mixture to induce flow of the evaporated refrigerant and the lubricant in the lubricant-liquid refrigerant mixture to the compressor . a compressor having a suction port and a discharge port , the compressor configured to receive refrigerant from the suction port , compress the refrigerant, and discharge the compressed refrigerant through the discharge port ; a condenser connected to the discharge port and configured to receive the compressed refrigerant from the compressor and condense the compressed refrigerant; an expansion device connected to the condenser and configured to receive the condensed refrigerant from the condenser ; a shell-and-tube style evaporator having an inlet port, a first outlet port , and a second outlet port , wherein the shell-and-tube style evaporator is configured to receive refrigerant from the expansion device through the inlet port, evaporate a portion of the refrigerant, and discharge the evaporated portion of the refrigerant through the first outlet port to the suction port , the second outlet port being in fluid flow communication with a location in the shell-and-tube style evaporator to which lubricant migrates during operation of the refrigeration system , the migrated lubricant mixing with liquid refrigerant in the shell-and-tube style evaporator to form a lubricant-liquid refrigerant mixture; characterized in that the system further comprises, a heat sink ; and a lubricant return line connecting the second outlet port to the suction port , wherein the lubricant return line is in heat exchange relationship with the heat sink such that heat is rejected from the heat sink to the lubricant-liquid refrigerant mixture to cool the heat sink and to evaporate the liquid refrigerant in the lubricant-liquid refrigerant mixture to induce flow of the evaporated refrigerant and the lubricant in the lubricant-liquid refrigerant mixture to the compressor . <EOS>