HEAT MEDIUM HEATING DEVICE, METHOD OF MANUFACTURING SAME, AND VEHICLE AIR CONDITIONING DEVICE USING SAME

摘要

This heat medium heating device (1) is provided with the following: a plurality of flat heat exchange tubes (14) in which U-turn flow channels are formed; a heat medium inlet and outlet header to which heat medium inlet and outlet pipes (15, 16) are connected, and to which one end of the plurality of flat heat exchange tubes (14) is connected at predetermined intervals and is brazed and joined; and a plurality of sets of PTC heaters (18) stacked between the flat heat exchange tubes (14). A heat exchange element (12) composed of the flat heat exchange tubes (14), the heat medium inlet and outlet header, and the PTC heaters (18) is sandwiched between a bottom surface of a holding plate (40) or housing (2) and a substrate mount (41), and is accommodated and installed inside the housing (2) in a state where the flat heat exchange tubes (14) and the PTC heaters (18) are in close contact.