Automotive air conditioner system

Details Automotive air conditioner system Automotive air conditioner system

1996-04-16

1997-04-01

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62225, 236 92B, F25B 4100, G05D 2700

Patent

active

056155603

ABSTRACT:
An automotive air conditioning system comprises a heat pump type refrigerant circuit charged with a first refrigerant and includes first and second internal heat exchangers disposed within an air conditioning duct and an external heat exchanger located outside the duct. A plurality of electromagnetic valves are selectively operated so that in one operational state the external heat exchanger performs as an evaporator and the second internal heat exchanger performs as a condenser, and such that in another operational state the external heat exchanger and the first internal heat exchanger perform as evaporators and the second internal heat exchanger performs as a condenser. A first pressure equalizing type expansion valve mechanism associated with the external heat exchanger has a P-T characteristic curve wherein a static superheat curve intersects with a saturated first refrigerant vapor curve when the temperature of the first refrigerant immediately upstream of the external heat exchanger is in a low range. A second pressure equalizing type expansion valve mechanism has a P-T characteristic curve wherein a static superheat curve generally extends parallel to a saturated first refrigerant vapor curve.

REFERENCES:
patent: 2511565 (1950-06-01), Carter
patent: 2542802 (1951-02-01), Ehlke
patent: 4979372 (1990-12-01), Tanaka
patent: 5477700 (1995-12-01), Iio

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