Electric heating device and vehicle air conditioner

Abstract

[Problem to be Solved] An object is to provide an electric heating device that can heat fluid efficiently at a time of intermediate output, and a vehicle air conditioner including the electric heating device. [Solution] To include a plurality of flow paths in which fluid flows and a plurality of heating modules arranged adjacent to the flow path and including heating elements that generate heat by energization. At the time of intermediate output, the heating element in the heating module provided adjacent to a flow path among the plurality of flow paths having a relatively large flow rate of fluid is energized.

1 . An electric heating device comprising:
 a plurality of flow paths in which fluid flows; and   a plurality of heating modules arranged adjacent to the flow paths and including heating elements that generate heat by energization, wherein   at a time of intermediate output, the heating element in the heating module provided adjacent to a flow path among the plurality of flow paths having a relatively large flow rate of fluid is energized.   
     
     
         2 . The electric heating device of  claim 1 , wherein the heating element is a PTC element. 
     
     
         3 . The electric heating device of  claim 1 , comprising:
 a first header that is provided at one end of the flow paths and supplies fluid to the flow paths; and   a second header that is provided at the other end of the flow paths and collects fluid discharged from the flow paths, wherein   the first header includes a fluid supply port for supplying fluid into the first header, and   the second header includes a fluid discharge port for discharging fluid to outside of the second header.   
     
     
         4 . A vehicle air conditioner comprising:
 a blower that takes outside air into an air flow path of an air conditioning unit and circulates air in a vehicle interior;   a cooler that is arranged on a downstream side of the blower and cools outside air; and   a heater that is arranged on a downstream side of the cooler and heats air cooled by the cooler, wherein   an electric heating device for heating fluid supplied to the heater is provided, and   the electric heating device is the electric heating device of any one of  claim 1 , and includes a circulation circuit for circulating the fluid to the electric heating device.   
     
     
         5 . The vehicle air conditioner of claim.  4 , comprising a controller that includes an in-vehicle temperature detector and instructs a predetermined output to the electric heating device according to an in-vehicle temperature detected by the in-vehicle temperature detector.