| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicular air conditioner that can improve fuel economy of a vehicle by shortening operating time of an engine for heating.SOLUTION: A vehicular air conditioner 10 includes: a first circulation passage 20 for circulating waste heat of an engine 22 by using a heating medium; and a second circulation passage 30 connected to the first circulation passage 20 in parallel and circulating the heating medium in a heater core 32 and a heat exchanger 34 for heating inside of a cabin. In the vehicular air conditioner 10, when a first temperature of the heating medium in the first circulation passage 20 is less than a heater intermittent permission temperature, the first circulation passage 20 and the second circulation passage 30 are not connected with each other so as to form a circulation passage having two systems. In the vehicular air conditioner 10, when the first temperature is equal to or higher than the heater intermittent permission temperature and equal to or higher than a second temperature of the heating medium in the second circulation passage 30, the first circulation passage 20 and the second circulation passage 30 are connected with each other so as to form a circulation passage having one system.SELECTED DRAWING: Figure 1 |
