Systems and methods for providing compressor cooling

A controller for a compressor system including a dynamic compressor and a cooling apparatus, the cooling apparatus including a heat exchanger and a supply duct fluidly connected between the heat exchanger and the dynamic compressor, the controller comprising:

• a processor;
• and
• a memory, the memory storing instructions that program the processor to:
• operate the dynamic compressor to compress a refrigerant;
• operate the cooling apparatus to provide a flow of refrigerant through the supply duct to a bearing of the dynamic compressor;
• determine if a condition is satisfied;
• and
• adjust a position of a valve in fluid communication between the dynamic compressor and the cooling apparatus when the condition is satisfied,
• wherein the valve is a first valve fluidly connected to the supply duct between the heat exchanger and the at least one bearing, wherein determining if the condition is satisfied comprises determining that the condition is satisfied when the dynamic compressor is no longer operating, and wherein adjusting the position of the valve comprises closing the first valve.

A compressor system comprising:

• a dynamic compressor operable to compress a refrigerant, the dynamic compressor comprising:
• a housing;
• a shaft supported in the housing by a bearing;
• and
• an impeller connected to the shaft;
• and
• a cooling apparatus comprising:
• a heat exchanger fluidly connected to the dynamic compressor;
• a supply duct fluidly connected between the heat exchanger and the dynamic compressor to provide a flow of refrigerant to the bearing;
• a valve fluidly connected to the supply duct and selectively positionable from an open position to permit refrigerant to flow through the supply duct to a closed position;
• and
• a controller operable to position the valve in the closed position when it is determined that the dynamic compressor is not operating.