CPC F25B 9/006 (2013.01) [F25B 13/00 (2013.01); F25B 41/24 (2021.01); F25B 49/022 (2013.01); F25B 2313/003 (2013.01); F25B 2313/004 (2013.01); F25B 2313/027 (2013.01); F25B 2400/075 (2013.01); F25B 2600/2513 (2013.01)] | 20 Claims |
1. A vapor compression system (20; 120; 220) comprising:
a first compressor (22A; 122A; 222A);
a second compressor (22B; 122B; 222B);
a first heat exchanger (40);
a second heat exchanger (46);
one or more expansion devices (52); and
means (32A, 32B; 32A, 32B, 126A, 126B; 32A, 32B, 232A, 232B) for switching the system between operation in:
a first mode wherein:
the first compressor compresses refrigerant;
the compressed refrigerant is cooled in the first heat exchanger;
the cooled refrigerant is expanded in at least one of the one or more expansion devices;
the expanded refrigerant absorbs heat in the second heat exchanger and returns to the first compressor; and
the second compressor is offline; and
a second mode wherein:
the second compressor compresses refrigerant;
the compressed refrigerant is cooled in the second heat exchanger;
the cooled refrigerant is expanded in at least one of the one or more expansion devices;
the expanded refrigerant absorbs heat in the first heat exchanger and returns to the second compressor; and
the first compressor is offline,
wherein:
the first compressor has a suction line (28A);
the first compressor has a discharge line (30A);
the second compressor has a suction line (28B);
the second compressor has a discharge line (30B);
the first compressor suction line (28A) and second compressor discharge line merge at a first junction (34); and
the first compressor discharge line and second compressor suction line merge at a second junction (36).
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