US 12,276,444 B2
Refrigeration cycle device
Kazushi Hisayama, Osaka (JP); Kebi Chen, Osaka (JP); and Tetsuya Okamoto, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Sep. 24, 2021, as Appl. No. 17/484,858.
Application 17/484,858 is a continuation of application No. PCT/JP2020/013873, filed on Mar. 26, 2020.
Claims priority of application No. 2019-067716 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0011020 A1, Jan. 13, 2022
Int. Cl. F25B 1/10 (2006.01); F25B 49/02 (2006.01)
CPC F25B 1/10 (2013.01) [F25B 49/022 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A refrigeration cycle device comprising:
a refrigerant circuit including a first compressor, a second compressor, a heat-source-side heat exchanger, an expansion mechanism, and a use-side heat exchanger, and capable of performing a single-stage compression operation in which one of the first compressor and the second compressor is driven and an other is stopped, and a two-stage compression operation in which both the first compressor and the second compressor are driven; and
a controller configured to control the refrigerant circuit so that, of the single-stage compression operation and the two-stage compression operation, an operation with a higher compression efficiency is performed, wherein
in a first operation in which a required capacity of the refrigerant circuit is below a predetermined capacity threshold, the controller is configured to control the refrigerant circuit so that the single-stage compression operation is performed,
in a second operation in which the required capacity of the refrigerant circuit is not below the predetermined capacity threshold, the controller is configured to control the refrigerant circuit so that the two-stage compression operation is performed, and
the predetermined capacity threshold is a value that changes in accordance with a physical quantity indicating a difference between a quantity correlated with a high pressure in the refrigerant circuit and a quantity correlated with a low pressure in the refrigerant circuit.