Refrigerating system with parallel staged economizer circuits using multistage compression
AssigneeCarrier Corporation
InventorsJames W. Bush, Wayne P. Beagle, Biswajit Mitra
Life of this patent
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Abstract
A refrigeration system (20A) comprises an evaporator (27), a two-stage compressor (32) for compressing a refrigerant, a second compressor (34) for compressing the refrigerant, a heat rejecting heat exchanger (24) for cooling the refrigerant, a first economizer circuit (25A), and a second economizer circuit (25B). The first economizer circuit (25A) is configured to inject refrigerant into an interstage port (48) of the two-stage compressor (32). The second economizer circuit (25B) is connected to the second compressor (34).
Claims22
A refrigeration system comprising:
- an evaporator for evaporating a refrigerant;
- a two-stage compressor for compressing the refrigerant, the two-stage compressor having a suction port, an interstage port, and a discharge port;
- a second compressor for compressing the refrigerant, the second compressor having a suction port and a discharge port;
- a heat rejecting heat exchanger for cooling the refrigerant;
- a first economizer circuit configured to inject refrigerant into the interstage port of the two-stage compressor, the first economizer circuit having an economizer heat exchanger and an expansion valve;
- and a second economizer circuit connected to the second compressor, the second economizer circuit having an economizer heat exchanger and an expansion valve;
- wherein the second economizer circuit is configured to inject a portion of the refrigerant into the suction port of the second compressor.
A method of operating a refrigeration system, the method comprising:
- evaporating a refrigerant;
- compressing the refrigerant from a lower pressure to a higher pressure with a two-stage compressor;
- cooling the refrigerant;
- directing the refrigerant through a plurality of economizer heat exchangers each having a main path and an economized path;
- injecting a first portion of the refrigerant from the economized path of one of the economizer heat exchangers into an interstage port of the two-stage compressor, compressing the first portion of the refrigerant in the two-stage compressor;
- injecting a second portion of the refrigerant from the economized path of another of the economizer heat exchangers into a port of a second compressor, and
- compressing the second portion of the refrigerant in the second compressor
- wherein the injecting a second portion of the refrigerant to injects a portion of the refrigerant into a suction port of the second compressor.
A refrigeration system comprising:
- an evaporator;
- a first compressor for compressing a refrigerant, wherein the refrigerant is carbon dioxide;
- a second compressor for compressing the refrigerant;
- a heat rejecting heat exchanger for cooling the refrigerant;
- and
- a plurality of economizer circuits, wherein each of the economizer circuits is configured to inject a portion of the refrigerant into a respective one of the compressors;
- wherein the first compressor is a two-stage compressor, and wherein a first economizer circuit is configured to inject a portion of the refrigerant into an interstage port of the first compressor;
- wherein the second compressor is a two-stage compressor, and wherein a second economizer circuit is configured to inject a second portion of the refrigerant into an interstage port of the second compressor;
- and
- wherein a third economizer circuit is configured to inject a third portion of the refrigerant into a suction port of the second compressor, the suction port being different then the interstage port.
Dependencies are inferred from the claim text.