Refrigeration cycle device
A refrigeration cycle device includes a refrigeration cycle, an outdoor heat exchanger, a cooling necessity determination unit, a determination reference setting unit, and a cooling control unit. The cooling necessity determination unit determines whether or not to cool a battery depending on whether or not a physical quantity that correlates with a temperature of the battery is equal to or more than a predetermined reference physical quantity. The determination reference setting unit sets the reference physical quantity for the cooling necessity determination unit according to the outdoor heat exchanger functioning as a heat absorber or radiator. When the outdoor heat exchanger functions as heat absorber, the determination reference setting unit sets a second reference physical quantity smaller than a first reference physical quantity set when the outdoor heat exchanger functions as radiator.
1. A refrigeration cycle device for an air conditioner comprising:
a refrigeration cycle including a compressor that compresses and discharges a refrigerant, a heating unit that heats air blown to an air-conditioned space using the refrigerant discharged from the compressor as a heat source, and a cooler unit that evaporates the refrigerant to cool a battery;
an outdoor heat exchanger configured to exchange heat between the refrigerant or a heat medium that exchanges heat with the refrigerant and an outside air;
a cooling necessity determination unit configured to determine whether or not to cool the battery based on whether or not a physical quantity having a correlation with a temperature of the battery is equal to or more than a predetermined reference physical quantity;
a determination reference setting unit configured to set the reference physical quantity for the cooling necessity determination unit depending on the outdoor heat exchanger functioning as heat absorber or radiator; and
a cooling control unit configured to cool of the battery using the cooler unit when the cooling necessity determination unit determines that the battery is to be cooled, wherein
the determination reference setting unit sets a second reference physical quantity when the outdoor heat exchanger functions as heat absorber, the second reference physical quantity being smaller than a first reference physical quantity which is set when the outdoor heat exchanger functions as radiator.
2. The refrigeration cycle device according to claim 1 , further comprising:
a circuit switching unit configured to switch a refrigerant circuit of the refrigeration cycle for the outdoor heat exchanger to function as radiator or heat absorber, wherein
the determination reference setting unit sets the first reference physical quantity when the circuit switching unit switches the refrigerant circuit of the refrigeration cycle for the outdoor heat exchanger to function as radiator, and
the determination reference setting unit sets the second reference physical quantity when the circuit switching unit switches the refrigerant circuit of the refrigeration cycle for the outdoor heat exchanger to function as heat absorber.
3. The refrigeration cycle device according to claim 1 , wherein
the heating unit has a first outdoor heat exchanger configured to exchange heat between a heat medium heated by heat of refrigerant discharged from the compressor and the outside air, as the outdoor heat exchanger,
the cooler unit has a second outdoor heat exchanger configured to exchange heat between a heat medium cooled by evaporation of the refrigerant and the outside air, as the outdoor heat exchanger,
the determination reference setting unit sets the first reference physical quantity when the first outdoor heat exchanger functions as radiator, and
the determination reference setting unit sets the second reference physical quantity when the second outdoor heat exchanger functions as heat absorber.
4. The refrigeration cycle device according to claim 1 , wherein
the second reference physical quantity is set to satisfy both a condition based on input/output characteristics of the battery with respect to the temperature of the battery and a condition based on deterioration tendency of the battery with respect to the temperature of the battery.
5. The refrigeration cycle device according to claim 4 , wherein the second reference physical quantity has a correlation with a temperature higher than a lower limit temperature of a temperature range of the battery determined by an input/output condition of the battery, and is lower than the first reference physical quantity.
6. The refrigeration cycle device according to claim 1 , wherein the first reference physical quantity is determined according to a condition based on input/output characteristics of the battery with respect to the temperature of the battery.
7. The refrigeration cycle device according to claim 6 , wherein the first reference physical quantity has a correlation with a temperature lower than an upper limit temperature of a temperature range of the battery determined by an input/output condition of the battery, and is higher than the second reference physical quantity.