Vehicle air-conditioner

A vehicle air-conditioner comprising:

• a compressor;
• a first condenser positioned outside of a vehicle-compartment;
• an expansion valve;
• an evaporator positioned within an air-passage in the vehicle-compartment for introducing inside or outside air;
• and
• a second condenser positioned on downstream side of the evaporator in the air-passage,
• wherein the vehicle air-conditioner has a heating operation mode and a cooling operation mode switchable therebetween,
• wherein the cooling operation mode allows refrigerant to be compressed by compressor, to be condensed by the first for radiating heat to outside air, to be reduced in pressure, to be evaporated by the evaporator, and to return back to the compressor,
• wherein the heating operation mode allows refrigerant to be compressed by the compressor, to bypass the first condenser, to be condensed by the second condenser for radiating heat to airflow through the air-passage, to be reduced in pressure, to be evaporated by the evaporator, and to return back to the compressor,
• wherein the evaporator and the compressor have an accumulator provided therebetween,
• wherein the expansion valve opens, while refrigerant has temperatures at 0° C. or less on outlet side of the evaporator.