Refrigeration – Automatic control – Trapping and discharging refrigerant batches
Patent
1989-11-28
1992-02-18
Ford, John K.
Refrigeration
Automatic control
Trapping and discharging refrigerant batches
623244, 62115, 622386, 622387, 237 2B, 165 29, F25B 2900, F25B 4100, F24F 500
Patent
active
050882961
ABSTRACT:
A heat pump refrigeration system has a refrigerant condition detector for detecting the mass of refrigerant in the system and initializing a refrigerant mass recovery operation. The heat pump system comprises three flow paths. When a cooling operation is performed, refrigerant flows in a first flow path through a compressor, outdoor heat exchanger, indoor heat exchanger, and the compressor, respectively. During a heating operation, refrigerant flows in a second flow path through the compressor, indoor heat exchanger, a refrigerant heater and the compressor, respectively. The system has a third flow path used during the refrigerant mass recovery operation. A controller causes the heating operation to continue in response to an appropriate signal from the condition detector. When the condition detector indicates an inappropriate refrigerant condition, the controller causes fluid to flow through the third flow path for a predetermined time period.
REFERENCES:
patent: 4441331 (1984-04-01), Yuyama
patent: 4482008 (1984-11-01), Nomaguchi
patent: 4484452 (1984-11-01), Houser, Jr.
patent: 4506521 (1985-03-01), Asano et al.
patent: 4516408 (1985-05-01), Chiba
patent: 4802529 (1989-02-01), Sumitani et al.
patent: 4905894 (1990-03-01), Noguchi
Ford John K.
Kabushiki Kaisha Toshiba
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