Refrigeration cycle apparatus

A refrigeration cycle apparatus comprising a refrigerant circuit through which refrigerant circulates in a forward direction or an opposite direction to the forward direction sequentially through a compressor, a four-way valve, an indoor heat exchanger, a first expansion valve, a heat storage body, a second expansion valve, and an outdoor heat exchanger, and the four-way valve, and back to the compressor,

• the refrigerant circuit comprising
• a first refrigerant pipe extending from the indoor heat exchanger through the first expansion valve, the heat storage body and the second expansion valve to the outdoor heat exchanger,
• a second refrigerant pipe connecting the four-way valve and the indoor heat exchanger,
• a third refrigerant pipe connecting the four-way valve and the outdoor heat exchanger,
• a fourth refrigerant pipe connecting a suction port of the compressor and the four-way valve,
• a bypass path branching off from a first portion in the first refrigerant pipe and leading to the fourth refrigerant pipe, the first portion connecting the indoor heat exchanger and the first expansion valve,
• a first on-off valve provided in the bypass path,
• a second on-off valve provided in the second refrigerant pipe;
• and
• a third on-off valve provided in the first portion of the first refrigerant pipe so as to be located close to the indoor heat exchanger with respect to a branch point to the bypass path, wherein
• each of the second on-off valve and the third on-off valve is opened during the heating operation and closed during the defrosting operation.