US 2023/0408166 A1Published application

Hot gas defrost system using hot gas from low temperature compressor

AssigneeHeatcraft Refrigeration Products LLC

InventorShitong Zha

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Abstract

A refrigeration system includes at least one low-temperature evaporator, at least one medium-temperature evaporator, one or more low-temperature compressors, and one or more medium-temperature compressors. A controllable valve positioned downstream from the one or more low-temperature compressors directs flow of refrigerant from the low-temperature compressor(s) to one or both of (i) the medium-temperature compressor(s) and (ii) one or more evaporators based on an operation mode of evaporators. A controller is communicatively coupled to the controllable valve. A controller determines that operation of a first evaporator in a defrost mode is indicated and causes the first evaporator to operate in the defrost mode by adjusting the controllable valve to direct a portion of the received compressed refrigerant to the first evaporator.

Claims20

Dependent claims

A refrigeration system, comprising:

a plurality of evaporators comprising at least one low-temperature evaporator and at least one medium-temperature evaporator;
one or more low-temperature compressors configured to compress refrigerant received from the at least one low-temperature evaporator;
one or more medium-temperature compressors configured to compress refrigerant received from the at least one medium-temperature evaporator;
a controllable valve positioned downstream from the one or more low-temperature compressors, the controllable valve configured to receive the compressed refrigerant from the one or more low-temperature compressors and direct flow of the received refrigerant to one or both of (i) the one or more medium-temperature compressors positioned downstream from the controllable valve and (ii) one or more evaporators of the plurality of evaporators based on an operation mode of the plurality of evaporators;
and a controller communicatively coupled to the controllable valve, wherein the controller is configured to:
determine that operation of a first evaporator of the plurality of evaporators in a defrost mode is indicated;
and
after determining that operation of the first evaporator in the defrost mode is indicated, cause the first evaporator to operate in the defrost mode by adjusting the controllable valve to direct a portion of the received compressed refrigerant to the first evaporator.

5 more elements

A controller of a refrigeration system, the controller comprising:

an input/output interface communicatively coupled to a controllable valve positioned downstream from one or more low-temperature compressors of the refrigeration system, wherein the controllable valve is configured to receive the compressed refrigerant from the one or more low-temperature compressors and direct flow of the received refrigerant to one or both of (i) one or more medium-temperature compressors positioned downstream from the controllable valve and (ii) one or more evaporators of the plurality of evaporators based on an operation mode of the plurality of evaporators;
and
a processor configured to:
determine that operation of a first evaporator of a plurality of evaporators of the refrigeration system in a defrost mode is indicated;
and
after determining that operation of the first evaporator in the defrost mode is indicated, cause the first evaporator to operate in the defrost mode by adjusting the controllable valve to direct a portion of the received compressed refrigerant to the first evaporator.

3 more elements

Dependencies are inferred from the claim text.