| 摘要 |
PROBLEM TO BE SOLVED: To maintain a heating feeling in a car room by a method wherein even during frosting or even when frost is about to form on an outdoor heat- exchanger, heating operation is continued and a current heating continuance time is lengthened as much as possible. SOLUTION: During execution of heating operation wherein an indoor heat- exchanger 12 for heating is functioned as a condenser and an outdoor heat- exchanger 22 as a vaporizer, when a given amount of frost is formed on the outdoor heat-exchanger 22, provided a current mode is an outside air introduction mode, an indoor airflow by a fan 9 is reduced. In which case, a heating load is reduced and through reduction of a heat absorbing amount of the outdoor heat-exchanger 22 through reduction of the heating load, a frosting speed is decreased and a frosting limit amount is also increased. This constitution lengthens a heating continuance time. |
