Steam turbine driven centrifugal heat pump

A heat pump system comprising:

• a steam system comprising a steam supply, a steam turbine and a steam condenser connected in a steam loop, wherein the steam turbine comprises a rotary drive shaft extending axially from a first end and a second end of the steam turbine;
• a refrigerant system comprising a first compressor and a second compressor, a refrigerant condenser, and an evaporator connected in a refrigerant loop;
• the first compressor coupled to a first portion of the rotary drive shaft extending from the first end of the steam turbine and the second compressor coupled to a second portion of the rotary drive shaft extending from the second end of the steam turbine, wherein the first compressor and the second compressor are connected in parallel in the refrigerant loop, and wherein the first compressor and the second compressor share a cooling load equally during operation of the heat pump system;
• a magnetic sensor coupled to a rotating surface of the rotary drive shaft, wherein the magnetic sensor is configured to monitor magnetic properties of the rotating surface, and wherein the magnetic properties are indicative of a motion of the rotary drive shaft;
• and
• a controller configured to adjust a position of pre-rotation vanes, a position of a hot gas bypass valve, a position of a variable geometry diffuser, or any combination thereof, of the first compressor, the second compressor, or both, based at least on the magnetic properties monitored by the magnetic sensor and a pressure differential of refrigerant in the refrigerant condenser and the evaporator.