Refrigeration apparatus

A refrigeration apparatus in which a refrigerant flows sequentially through a compressor, an outdoor heat exchanger, expansion mechanisms, and an indoor heat exchanger during a cooling operation, and the refrigerant flows sequentially through the compressor, the indoor heat exchanger, the expansion mechanisms, and the outdoor heat exchanger during a heating operation;

• the indoor heat exchanger being a cross-fin heat exchanger and the outdoor heat exchanger being a stacked heat exchanger, and a capacity ratio of the outdoor heat, exchanger to the indoor heat exchanger is 0.3 to 0.9;
• the expansion mechanisms including
• an upstream-side expansion mechanism configured to depressurize the refrigerant from a high pressure in a refrigerant cycle to an intermediate pressure in the refrigerant cycle and
• a downstream-side expansion mechanism configured to depressurize the refrigerant that has been depressurized in the upstream-side expansion mechanism from the intermediate pressure in the refrigerant cycle to a low pressure in the refrigerant cycle;
• the outdoor heat exchanger, the upstream-side expansion mechanism and the downstream-side expansion mechanism being provided in an outdoor unit, the indoor heat exchanger being provided in an indoor unit, and the outdoor unit and the indoor unit being connected via a liquid refrigerant communication tube;
• the refrigerant being R32;
• a refrigerant storage tank configured and arranged to store the refrigerant depressurized to the intermediate pressure in the refrigerant cycle by the upstream-side expansion mechanism being provided between the upstream-side expansion mechanism and the downstream -side expansion mechanism;
• and
• the refrigerant storage tank storing an excess refrigerant produced during the cooling operation due to a capacity of the outdoor heat exchanger being less than a capacity of the indoor heat exchanger.