HEAT MEDIUM HEATING DEVICE AND VEHICLE AIR CONDITIONER PROVIDED WITH SAME

摘要

An object of the present invention is to provide a small, lightweight, and inexpensive heat medium heating apparatus in which a flat tube heat exchanger and a PTC heater are laminated in a multi-layered manner to reduce a thermal contact resistance thereamong, heat transfer performance is improved, and also in which assembling of the flat tube heat exchanger and the PTC heater is made easier. The heat medium heating apparatus is provided with: a plurality of flat tube heat exchangers (17); PTC heaters (18) that are incorporated between flat tube sections of the plurality of flat tube heat exchangers (17); and a heat exchanger pressing member (16) that presses the laminated flat tube heat exchangers (17) and PTC heaters (18) from a one surface side of the flat tube heat exchangers (17) to bring them into close contact with each other, wherein each flat tube heat exchanger (17) is made as the tube in which an inlet header section (21) and an outlet header section (22) are located side by side at one end, a U-turn section is formed at the other end, and also in which the flat tube section forms a U-turn flow path leading from the inlet header section (21) to the outlet header section (22) through the U-turn section, and wherein the flat tube heat exchanger (17) and the PTC heater (18) are alternately laminatedly disposed in the multi-layered manner.