Refrigeration cycle device
During a normal operation, a refrigeration cycle device is switched to a refrigerant circuit in which heat contained in a high-pressure refrigerant flowing out of an interior radiator is stored in a heat storage member. When frost is formed on an evaporator, the refrigeration cycle device is switched to another refrigerant circuit in which the exterior heat exchanger is heated and defrosted using heat stored in the heat storage member as a heat source. The heat storage member uses a material formed by adding W (tungsten) as an additive to VO 2 (vanadium dioxide) which is a transition metal oxide having a property of a phase transition between a metal and an insulator. The heat storage member effectively stores or dissipates heat depending on a temperature zone of the refrigerant, thereby suppressing an increase in energy consumption of a compressor.
1. A refrigeration cycle device comprising:
a compressor that compresses and discharges a refrigerant;
a radiator that dissipates heat from the refrigerant;
a decompression device that decompresses the refrigerant;
an evaporator that evaporates the refrigerant; and
a heat storage member provided in a refrigerant flow passage through which the refrigerant circulates, the heat storage member being made of a strongly correlated electron-based solid material that stores or dissipates heat by undergoing a phase transition between a metal and an insulator, the heat storage member having a plurality of holes extending from an inlet side to an outlet side of the heat storage member, and the heat storage member being configured to store and dissipate heat by the strongly correlated electron-based material directly contacting the refrigerant circulating through the plurality of holes extending from the inlet side to the outlet side of the heat storage member, wherein
during a normal operation, the heat storage member stores heat contained in high-pressure refrigerant that circulates through the refrigerant flow passage from a discharge side of the compressor, and
during a defrosting operation, the heat storage member dissipates heat into the refrigerant that circulates through the refrigerant flow passage leading to the evaporator and to heat and remove frost formed on the evaporator.
2. The refrigeration cycle device according to claim 1 , wherein
the strongly correlated electron-based material is a transition metal oxide selected from the group consisting of vanadium dioxide and vanadium dioxide plus at least one additive selected from the group consisting of tungsten, chromium, niobium, titanium, aluminum, manganese, iron, cobalt, nickel, copper, yttrium, zirconium, molybdenum, ruthenium, rhodium, palladium, hafnium, tantalum, and rhenium.
3. The refrigeration cycle device according to claim 1 , further comprising:
a heating heat storage member configured to store heat contained in the refrigerant circulating through the radiator during the normal operation, wherein
the radiator is configured to heat a fluid to be heated by dissipating heat of the refrigerant into the fluid to be heated during the normal operation, and
the radiator is configured to heat the fluid to be heated by using the heat stored in the heating heat storage member as a heat source during the defrosting operation.
4. The refrigeration cycle device according to claim 1 , further comprising:
a switching device capable of switching between operation modes, including the normal operation and the defrosting operation; and
a controller configured to control an operation of the switching device.
5. The refrigeration cycle device according to claim 1 , wherein
the strongly correlated electron-based material has a phase transition temperature range of 20 to 40° C.
6. The refrigeration cycle device according to claim 2 , wherein
the transition metal oxide has a transition temperature range of approximately 20 to 40° C.