Air conditioner

An air conditioner, wherein

• to a refrigerant circuit in which a refrigerant is circulated,
• a compressor configured to compress the refrigerant,
• an indoor heat exchanger configured to exchange heat between indoor air and the refrigerant,
• an outdoor heat exchanger configured to exchange heat between outdoor air and the refrigerant,
• a thermal-storage heat exchanger configured to exchange heat between a thermal storage material and the refrigerant,
• a plurality of expansion valves, an opening degree of which is adjustable, and
• a plurality of switching valves to switch a circulation path of the refrigerant in the refrigerant circuit between a thermal-storage heating operation in which the indoor heat exchanger and the thermal-storage heat exchanger function as a condenser and the outdoor heat exchanger functions as an evaporator, and a defrosting heating operation in which the indoor heat exchanger and the outdoor heat exchanger function as the condenser and the thermal-storage heat exchanger functions as the evaporator are connected, and
• one of the expansion valves is arranged upstream to the outdoor heat exchanger when the outdoor heat exchanger functions as a condenser, and a refrigerant that flows into the outdoor heat exchanger is depressurized by the one of the expansion valves.