US 12,472,800 B2
Refrigeration cycle device for vehicle
Ikuhiro Iwata, Osaka (JP); Eiji Kumakura, Osaka (JP); Tetsushi Tsuda, Osaka (JP); and Shinjiro Domi, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on Sep. 28, 2023, as Appl. No. 18/476,790.
Application 18/476,790 is a continuation of application No. PCT/JP2022/016181, filed on Mar. 30, 2022.
Claims priority of application No. 2021-061761 (JP), filed on Mar. 31, 2021.
Prior Publication US 2024/0017595 A1, Jan. 18, 2024
Int. Cl. B60H 1/00 (2006.01); F25B 5/04 (2006.01); F25B 6/04 (2006.01); F25B 9/00 (2006.01)
CPC B60H 1/00899 (2013.01) [F25B 5/04 (2013.01); F25B 6/04 (2013.01); F25B 9/006 (2013.01); B60H 2001/00942 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A refrigeration cycle device for a vehicle, comprising:
a refrigerant circuit, in which a zeotropic refrigerant mixture is circulated, comprising a utilization heat exchanger including:
a first heat exchange portion; and
a second heat exchange portion disposed in series with the first heat exchange portion in a direction in which the zeotropic refrigerant mixture flows in the refrigerant circuit, wherein
the first heat exchange portion is disposed on an upstream side of the second heat exchange portion in a direction in which the zeotropic refrigerant mixture flows when the utilization heat exchanger functions as an evaporator of the zeotropic refrigerant mixture, and
when the utilization heat exchanger functions as the evaporator, an evaporation temperature of the zeotropic refrigerant mixture in the first heat exchange portion is lower than an evaporation temperature of the zeotropic refrigerant mixture in the second heat exchange portion.
 
4. A refrigeration cycle device for a vehicle, comprising:
a refrigerant circuit, in which a zeotropic refrigerant mixture is circulated, comprising a utilization heat exchanger including:
a first heat exchange portion; and
a second heat exchange portion disposed in series with the first heat exchange portion in a direction in which the zeotropic refrigerant mixture flows in the refrigerant circuit, wherein
the first heat exchange portion is disposed on an upstream side of the second heat exchange portion in a direction in which the zeotropic refrigerant mixture flows when the utilization heat exchanger functions as an evaporator of the zeotropic refrigerant mixture, and
one of the first and second heat exchange portions that has the larger heat load to be treated is disposed on an upstream side of a flow of the zeotropic refrigerant mixture.
 
6. A refrigeration cycle device for a vehicle comprising:
a refrigerant circuit, in which a zeotropic refrigerant mixture is circulated, comprising a utilization heat exchanger including:
a first heat exchange portion;
a second heat exchange portion; and
a switch that switches the refrigerant circuit between a first state and a second state, wherein
in the first state, the first heat exchange portion is disposed on an upstream side of the second heat exchange portion in a flow of the zeotropic refrigerant mixture,
in the second state, the second heat exchange portion is disposed on an upstream side of the first heat exchange portion in a flow of the zeotropic refrigerant mixture, and
the switch switches into the first state when the utilization heat exchanger functions as an evaporator of the zeotropic refrigerant mixture and is controlled such that an evaporation temperature of the zeotropic refrigerant mixture in the first heat exchange portion is lower than an evaporation temperature of the zeotropic refrigerant mixture in the second heat exchange portion.
 
8. A refrigeration cycle device for a vehicle comprising:
a refrigerant circuit, in which a zeotropic refrigerant mixture is circulated, comprising a utilization heat exchanger including:
a first heat exchange portion;
a second heat exchange portion; and
a switch that switches the refrigerant circuit between a first state and a second state, wherein
in the first state, the first heat exchange portion is disposed on an upstream side of the second heat exchange portion in a flow of the zeotropic refrigerant mixture,
in the second state, the second heat exchange portion is disposed on an upstream side of the first heat exchange portion in a flow of the zeotropic refrigerant mixture, and
the switch switches into the first state when the utilization heat exchanger functions as a condenser of the zeotropic refrigerant mixture and is controlled such that a condensation temperature of the zeotropic refrigerant mixture in the first heat exchange portion is higher than a condensation temperature of the zeotropic refrigerant mixture in the second heat exchange portion.
 
11. A refrigeration cycle device for a vehicle, comprising:
a refrigerant circuit, in which a zeotropic refrigerant mixture is circulated, comprising a utilization heat exchanger including:
a first heat exchange portion; and
a second heat exchange portion disposed in series with the first heat exchange portion in a direction in which the zeotropic refrigerant mixture flows in the refrigerant circuit, wherein
the first heat exchange portion is disposed on an upstream side of the second heat exchange portion in a direction in which the zeotropic refrigerant mixture flows when the utilization heat exchanger functions as an evaporator of the zeotropic refrigerant mixture, and
the zeotropic refrigerant mixture includes HFO (hydrofluoroolefin) 1132.