Invention Grant
- Patent Title: Systems and methods for controlling differential refrigerant pressure
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Application No.: US16457351Application Date: 2019-06-28
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Publication No.: US10935293B2Publication Date: 2021-03-02
- Inventor: Philippe Del Marcel Tisserand , Yves Jacques Raimbault , Stephane Koenigsecker
- Applicant: TRANE INTERNATIONAL INC.
- Applicant Address: US NC Davidson
- Assignee: TRANE INTERNATIONAL INC.
- Current Assignee: TRANE INTERNATIONAL INC.
- Current Assignee Address: US NC Davidson
- Agency: Hamre, Schumann, Mueller & Larson, P.C.
- Main IPC: F25B49/02
- IPC: F25B49/02 ; F25B31/00

Abstract:
Systems and methods are provided for controlling compressor systems to ensure sufficient pressure differentials to provide cooling. A compressor system includes a compressor, a suction pressure sensor at a suction of the compressor, a discharge pressure sensor, a condenser, an expansion device, a liquid line, a liquid line pressure sensor, an evaporator, a condenser blower and a controller. The method includes determining a pressure target based on an intermediate pressure within the compressor and a threshold cooling differential pressure value, determining a pressure ratio setpoint based on the pressure target and a liquid line pressure measured by the liquid line pressure sensor, controlling the condenser blower to operate based on the determined pressure ratio setpoint, determining a subcooling setpoint based on the pressure target and the liquid line pressure in the compressor system, and controlling the expansion device to operate based on the subcooling setpoint.
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