US 12,222,146 B2
Cascade unit and refrigeration cycle apparatus
Kumiko Saeki, Osaka (JP); Yuta Iyoshi, Osaka (JP); and Yoshiki Yamanoi, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Mar. 29, 2024, as Appl. No. 18/621,426.
Application 18/621,426 is a continuation of application No. PCT/JP2022/035759, filed on Sep. 26, 2022.
Claims priority of application No. 2021-161996 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0240837 A1, Jul. 18, 2024
Int. Cl. F25B 7/00 (2006.01); F25B 9/00 (2006.01)
CPC F25B 7/00 (2013.01) [F25B 9/008 (2013.01); F25B 2600/00 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A refrigeration cycle apparatus comprising
a first circuit in which a heat medium conveying heat flows and that includes a first heat exchanger that exchanges heat between a heat source and the heat medium;
a second circuit in which a refrigerant flows and that includes a compressor and a second heat exchanger that exchanges heat with indoor air;
a cascade heat exchanger that exchanges heat between the heat medium flowing in the first circuit and the refrigerant flowing in the second circuit; and
a cascade unit comprising:
the compressor;
the cascade heat exchanger;
an electric component;
a cooling portion that cools the electric component by the refrigerant flowing through the second circuit; and
a cascade casing that accommodates the compressor, the electric component, and the cooling portion,
wherein the refrigerant is a refrigerant including a carbon dioxide refrigerant, and
the refrigeration cycle apparatus includes a controller that controls a state of the refrigerant flowing through the cooling portion to be equal to or less than a critical pressure or equal to or less than a critical temperature.