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 a line fluidly connected 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 lubricant return line connecting the second outlet port to the suction port; a heat sink; a lubricant return heat exchanger connected to the lubricant return line; and a coolant loop connecting the heat sink and the lubricant return heat exchanger and configured to circulate a coolant between the heat sink and the lubricant return heat exchanger such that heat transferred to the heat sink is transferred from the heat sink to the coolant, heat from the coolant is transferred to the lubricant-liquid refrigerant mixture in the lubricant return heat exchanger to cool the coolant and 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 a line fluidly connected 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 lubricant return line connecting the second outlet port to the suction port; a heat sink; a lubricant return heat exchanger connected to the lubricant return line; and a coolant loop connecting the heat sink and the lubricant return heat exchanger and configured to circulate a coolant between the heat sink and the lubricant return heat exchanger such that heat transferred to the heat sink is transferred from the heat sink to the coolant, heat from the coolant is transferred to the lubricant-liquid refrigerant mixture in the lubricant return heat exchanger to cool the coolant and 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.