Refrigeration – Automatic control – Refrigeration producer
Patent
1992-01-28
1993-10-05
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
62201, F25B 4100
Patent
active
052494322
ABSTRACT:
A refrigerant discharged from a compressor is flowed to air heat exchangers, an expansion valve, and a water heat exchanger unit, and the refrigerant passing through the water heat exchanger unit is taken in by the compressor, thus executing a heating operation mode. The expansion valve has a heat-sensitive portion for sensing a temperature of the refrigerant taken in by the compressor. The opening degree of the expansion valve is changed in accordance with a difference between the temperature of the refrigerant flowing therein and a temperature sensed by the heat-sensitive portion. A bypass is provided for supplying part of the refrigerant passing through the air heat exchangers to the suction side of the compressor. The bypass is caused to communicate when a temperature of water supplied to the water heat exchanger unit is increased. By this communication, the low-temperature refrigerant then flows to the suction side of the compressor to cool the heat-sensitive portion of the expansion valve. An unnecessary increase in opening degree of the expansion valve is prevented.
REFERENCES:
patent: 3435627 (1969-04-01), Castillo
patent: 4148436 (1979-04-01), Shaw
patent: 4742689 (1988-05-01), Lowes
Kabushiki Kaisha Toshiba
Wayner William E.
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