Onboard air conditioning device, air conditioning unit, and vehicle

An in-vehicle air conditioning apparatus mounted in a vehicle having a battery, the in-vehicle air conditioning apparatus comprising:

• an air conditioning unit that sends temperature-controlled air into a vehicle interior;
• and
• an airflow passage that is connected to the air conditioning unit at one end, that has an opening into the vehicle interior at another end, and that sends air taken in from the vehicle interior into the air conditioning unit after the air is heated by exhaust heat of the battery, wherein:
• the air conditioning unit includes a sensible heat exchanger that discharges the air sent from the airflow passage to the outside of the vehicle interior after subjecting the air to heat exchange with air taken in from a channel different from the airflow passage;
• the air conditioning unit sends the air taken in from the different channel and being subjected to heat exchange in the sensible heat exchanger into the vehicle interior;
• the opening of the airflow passage in communication with the vehicle interior is referred to as a first opening;
• the air conditioning unit includes:
• an air inlet that takes in air from the channel different from the airflow passage;
• a second opening into the vehicle interior;
• and an opening into the outside of the vehicle interior, and the air conditioning unit is configured to send, to the vehicle interior through the second opening, the air taken in from the different channel and subjected to heat exchange in the sensible heat exchanger;
• the sensible heat exchanger is configured to perform heat exchange between the air sent from the airflow passage and the air taken in through the air inlet and to discharge the air sent from the airflow passage to the outside of the vehicle interior through the opening into the outside of the vehicle interior;
• the first opening, the battery, the sensible heat exchanger, and the opening into the outside of the vehicle interior are disposed in this order from an upstream side to a downstream side in a first channel that includes the airflow passage and that is used for causing air to flow from the vehicle interior to the outside of the vehicle interior;
• the air inlet, the sensible heat exchanger, and the second opening are disposed in this order from an upstream side to a downstream side in a second channel that includes the different channel and that is used for sending air into the vehicle interior;
• the first channel and the second channel are mutually independent channels in which no air in either one of the channels mixes with air in the other one of the channels throughout the channels;
• and
• the air conditioning unit includes, as the air inlet:
• an outside air intake that introduces outside air from the outside of the vehicle interior;
• and
• an inside air intake that introduces inside air taken in from the channel different from the airflow passage, and the different channel is connected to the outside air intake and the inside air intake and is used for selectively switching between the taken outside air and the taken inside air or for mixing the taken outside air and the taken inside air together, and for sending the selected air or the mixed air to the sensible heat exchanger.