PURPOSE: To reduce necessary cooling capacity and to realize saving of a power.
CONSTITUTION: A vaporizer 78 serving as a heat-exchanger is arranged in an air guide duct 70 and on the wake flow side of a blower fan 74 and a subcooler 3 serving as an auxiliary heat-exchanger is arranged on the wake flow side of a fan 14 for suction in a suction duct 62. Both the vaporizer 78 and the subcooler 3 are arranged in the same freezing cycle and since the same refrigerant flows therein, a refrigerant cooled in the subcooler 3 by means of suction cold air flows in the vaporizer 78 in the air guide duct and is used for heat-exchanger. Air-conditioned air discharged through a discharge port 72 toward a peripheral space is sucked through a suction port 60 disposed in an opposite position, whereby only the periphery of seated passenger is centralizedly air-conditioned by means of the air-conditioned air. Further, energy used for cooling is reduced to a freezing cycle. In the increase of temperature to a desired value, a relatively lower flow rate of a refrigerant suffices for a value necessary to a freezing cycle, and saving of a power can be achieved.
INOUE YOSHIMITSU
TAKANO YOSHIAKI
OSUGA MASAHIKO
