Patent ID: 8528354

Claim:
A vehicle air-conditioning system comprising: a first condenser wherein a refrigerant circulates and exchanges heat with an outside air; a single decompressing means for decompressing the refrigerant in cooling and heating operations; a first evaporator wherein the refrigerant passing through the single decompressing means exchanges heat with an air for air-conditioning; a compressor disposed downstream of the first evaporator; a second condenser wherein the refrigerant exhausted from the compressor exchanges heat with the air for air-conditioning with which the first evaporator exchanges heat; a second condenser air bypass means to supply the air for air-conditioning with which the first evaporator exchanges heat to a vehicle interior without exchanging heat at the second condenser; a bypass means control unit to control the second condenser air bypass means such that the supplied air for air-conditioning bypasses the second condenser in a cooling operation and the supplied air for air conditioning passes through the second condenser in a heating operation, the first evaporator and the second condenser are disposed in series with a flow path of the air for air-conditioning, an air-conditioning operation is changed between cooling operation and heating operation by controlling with the bypass means control unit; a second evaporator disposed in a flow path of the refrigerant between the single decompressing means and the first evaporator where a heat exchange is performed in the second evaporator between a fluid other than the air supplied to the vehicle interior for air conditioning and the refrigerant so as to heat the refrigerant, the fluid having a temperature higher than the refrigerant passing through the second evaporator, the refrigerant heated in the second evaporator supplied to the first evaporator in a heating operation, the heated refrigerant preventing dew condensation in the first evaporator when air from outside the vehicle is introduced to the first evaporator; and a second evaporator bypass path through which the refrigerant decompressed by the single decompressing means bypasses the second evaporator and flows into the first evaporator in the cooling operation, wherein the refrigerant is diverted while flowing through an actuating change means to the second evaporator bypass path, the actuating change means located downstream of the single decompressing means and located between the first and second condensers, and the first condenser is disposed between the second condenser and the single decompressing means, and wherein in the heating operation the refrigerant flows from the single decompressing means to the second evaporator through the actuating change means.