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US 11,092,370 B2Granted
Systems and methods for low load compressor operations
AssigneeHeatcraft Refrigeration (Wuxi) Co., Ltd.
InventorsZhi Zhang, Yang Xie, Hongxiang Chen
Life of this patent
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Abstract
The present application provides a low load operating system for a refrigeration system having a compressor, a condenser, an expansion valve, and an evaporator. The low load operating system may include a hot gas bypass line extending from a discharge side of the compressor to a suction side of the compressor and a desuperheat line extending from upstream of the expansion valve to the suction side of the compressor.
Claims16
A refrigeration system for conditioning a climate controlled area, comprising:
- a plurality of compressors racks arranged in a series configuration, wherein each compressor rack includes at least one compressor;
- a condenser positioned downstream of the plurality of compressor racks;
- an expansion valve positioned downstream of a receiver, wherein the receiver is configured to store liquid refrigerant;
- at least one evaporator positioned downstream of the expansion valve, wherein the at least one evaporator is positioned adjacent the climate controlled area;
- an oil return line coupled to the refrigeration system via a controller, wherein the oil return line is disposed downstream of an oil separator and upstream of the condenser and further coupled upstream of the least one evaporator and downstream of the receiver;
- wherein the controller is configured to:
- determine whether only one compressor of a plurality of compressors will be cycled;
- and
- responsive to a determination that only one compressor of the plurality of compressors will be cycled, open a hot gas bypass line solenoid valve to increase suction pressure and open a desuperheat line solenoid valve to allow refrigerant to flow therethrough to avoid frequent compressor cycling.
6 more elements
A refrigeration system for conditioning a climate controlled area, comprising:
- a plurality of compressors racks arranged in a parallel configuration, wherein each compressor rack includes at least one compressor;
- a condenser positioned downstream of the plurality of compressor racks;
- an expansion valve positioned downstream of a receiver, wherein the receiver is configured to store liquid refrigerant;
- at least one evaporator positioned downstream of the expansion valve, wherein the at least one evaporator is positioned adjacent the climate controlled area;
- comprising an oil return line coupled to the refrigeration system via a controller, wherein the oil return line is disposed downstream of a hot gas bypass line and downstream of an oil separator and upstream of the condenser and further coupled upstream of the least one evaporator and downstream of the receiver;
- wherein the controller is configured to:
- determine whether only one compressor of a plurality of compressors will be cycled;
- and
- responsive to a determination that only one compressor of the plurality of compressors will be cycled, open a hot gas bypass line solenoid valve to increase suction pressure and open a desuperheat line solenoid valve to allow refrigerant to flow therethrough to avoid frequent compressor cycling.
6 more elements
Dependencies are inferred from the claim text.