JP-WO2025158523-A5 -

Dates

Publication Date

20260507

Application Date

20240123

Description

The heat exchanger according to this disclosure comprises a pair of headers arranged vertically spaced apart from each other, through which a refrigerant passes; a plurality of heat exchange sections, each having a flow path for the refrigerant, connected in multiple rows at intervals along the longitudinal direction of the pair of headers; and a refrigerant inlet/outlet pipe connected to the lower header of the pair of headers, through which the refrigerant flows in and out of the external refrigerant piping; a heat exchange section that serves as a main heat exchange section for exchanging heat between air and refrigerant and condensing the refrigerant; and a heat exchange section that serves as a subcooling heat exchange section for exchanging heat between the refrigerant that has passed through the main heat exchange section and air, thereby subcooling the refrigerant that has passed through the main heat exchange section. The subcooling heat exchange section is configured such that a heat exchange section is not connected to one end of the top surface of the lower header. The system has a connection region, and the refrigerant inlet and outlet pipes are connected in the unconnected region. The connection pipes connect the refrigerant inlet and outlet pipe on the refrigerant outlet side of the main heat exchange section to the refrigerant inlet and outlet pipe on the refrigerant inflow side of the subcooled heat exchange section when condensation occurs in the main heat exchange section. At least the lower header on the refrigerant outlet side of the main heat exchange section and the lower header in the subcooled heat exchange section have an outer tube to which multiple heat transfer tubes are connected, an inner tube installed inside the outer tube which acts as a wall dividing the inside of the outer tube into a first space where no heat transfer tubes are connected and a second space where heat transfer tubes are connected, and a partition plate which acts as a wall dividing the inside of the outer tube into a second space where heat transfer tubes are connected and a third space where refrigerant inlet and outlet pipes are connected. The inner tube has multiple orifices that connect the first space and the second space .