Heat pump type air conditioner for automotive vehicle

Details Heat pump type air conditioner for automotive vehicle Heat pump type air conditioner for automotive vehicle

1993-05-25

1994-10-18

Wayner, William E.

Refrigeration

Automatic control

Selective heating or cooling

62180, 621964, F25B 2900, F25B 4100

Patent

active

053556895

ABSTRACT:
A heat pump type air conditioner for an automotive vehicle has a compressor whose outlet is connected to a condenser and a heat-radiating inner heat exchanger through a three-way valve. The heat-radiating inner heat exchanger is connected to an evaporator through an expansion valve. The evaporator is connected to an inlet of the compressor. During a cooling operation, the three-way valve is set to lead the refrigerant from the compressor to the condenser. During a heating operation, the three-way valve is set to lead the refrigerant from the compressor to the heat-radiating inner heat exchanger while bypassing the condenser. A control unit controls such that a cooling efficiency of the condenser is lowered for a predetermined time when the compressor is started. Therefore, the heating operation is securely implemented, and a start-up period in starting is shortened. Furthermore, the freezing of the condenser is avoided.

REFERENCES:
patent: 3738117 (1973-06-01), Engel
patent: 3798920 (1974-03-01), Morgan
patent: 3914952 (1975-10-01), Barbier

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