Heat exchanger and refrigeration cycle apparatus including the same

A heat exchanger, comprising:

• a plurality of refrigerant flow paths each being a flow path into which refrigerant flows in a gas state and out of which the refrigerant flows in a liquid state, the plurality of refrigerant flow paths including upstream-side flow paths allowing passage of the refrigerant in the gas state and a two-phase gas-liquid state, and at least one downstream-side flow path allowing passage of the refrigerant in the two-phase gas-liquid state and the liquid state;
• an upstream-side heat exchanger including the upstream-side flow paths;
• a downstream-side heat exchanger arranged below the upstream-side heat exchanger and, including the at least one downstream-side flow path;
• and
• at least one merger for merging the refrigerant flowing out of each of the upstream-side flow paths and causing the merged refrigerant to flow into the at least one downstream-side flow path,
• the upstream-side heat exchanger and the downstream-side heat exchanger being configured separately,
• the number of the downstream-side flow paths being smaller than the number of the upstream-side flow paths,
• the upstream-side heat exchanger and the downstream-side heat exchanger each including heat exchange units,
• the heat exchange units each including
• a plurality of radiator fins arranged in parallel with each other at intervals and allowing passage of air through the intervals, and
• a plurality of heat transfer tubes penetrating through the plurality of radiator fins in an arrangement direction of the plurality of radiator fins,
• the upstream-side heat exchanger and the downstream-side heat exchanger each having the heat exchange units arranged in an air passage direction,
• the number of the heat exchange units in the downstream-side heat exchanger being smaller than the number of the heat exchange units in the upstream-side heat exchanger,
• a total width of the heat exchange units in the air passage direction in the upstream-side heat exchanger and a total width of the heat exchange units in the air passage direction in the downstream-side heat exchanger being the same with each other.