Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Patent
1987-07-27
1988-08-30
Tanner, Harry B.
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
62199, 62225, 62204, 62212, 165 22, F24F 300
Patent
active
047667354
ABSTRACT:
A single outdoor unit has at least an inverter circuit, a compressor motor, a variable capacity compressor, and an outdoor heat exchanger. A plurality of indoor units each have at least an indoor heat exchanger and an air-conditioning load detector. A distribution unit couples the single outdoor unit to the plurality of indoor units in parallel by liquid-side refrigerant piping and gas-side refrigerant piping, to form a refrigerating cycle of a heat pump type. The liquid-side refrigerant piping includes a motor-operated flow regulating valve and pressure reducer, which are connected in series fashion. A pseudo-refrigerant superheating state detector detects a pseudo-refrigerant overheating state on the basis of the temperature of the refrigerant in the aggregated portion of gas-side refrigerant piping of the distribution unit. A first controller respectively controls the open factors of the motor-operated flow regulating valves. A second controller computes a total amount of the contents of the predetermined frequency data corresponding to a total air conditioning load of the indoor heat exchangers and controls the output frequency of the inverter circuit according to the total amount. A third controller incrementally controls the open factor of the motor-operated flow regulating valves to a value larger than the current value, on the basis of the detection result of the pseudo-refrigerant superheat state detector.
REFERENCES:
patent: 4448038 (1984-05-01), Barbier
patent: 4487031 (1984-12-01), Rogers et al.
patent: 4499739 (1985-02-01), Matsuoka et al.
patent: 4510767 (1985-04-01), Komatsu et al.
patent: 4644756 (1987-02-01), Sugimoto et al.
Kabushiki Kaisha Toshiba
Tanner Harry B.
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