AIR CONDITIONER FOR VEHICLE AND AIR CONDITIONING METHOD FOR VEHICLE

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of performing air conditioning operation also when stopping in an idle stop mode by improving a rapid heating effect without complicating a device constitution. SOLUTION: In this air conditioner 23, a first coolant bypass pipe 25 branched from a coolant pipe 18 for connecting a discharge port of a coolant compressor 12 and a water-coolant heat exchanger 13 to be conducted to the mid-way of the coolant pipe 18 for connecting a first chamber internal heat exchanger 16 and an accumulator 17 is disposed. In the mid-way of the first coolant bypass pipe 25, a first solenoid valve (first circulating/interrupting means) 26 to circulate/interrupt coolant is provided. In the mid-way of a cooling water pipe 22 for connecting a traveling motor (hot water heat source) 24 and the water-coolant heat exchanger 13, a second solenoid valve (second circulating/interrupting means) 27 to circulate/interrupt cooling water is provided. In the mid-way of the coolant pipe 18 for connecting the water-coolant heat exchanger 13 and an outdoor heat exchanger 14, a third solenoid valve 28 to circulate/interrupt the coolant is provided. COPYRIGHT: (C)2004,JPO&NCIPI