Low refrigerant charge detection by monitoring thermal expansion

Details Low refrigerant charge detection by monitoring thermal expansion Low refrigerant charge detection by monitoring thermal expansion

1992-12-02

1994-04-12

Tanner, Harry B.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62129, F25B 4902

Patent

active

053015142

ABSTRACT:
Low refrigerant charge in a refrigeration system is detected by monitoring the oscillation of the thermal expansion valve. This monitoring is accomplished with a sensor which senses the oscillation of the expansion valve and produces a signal indicative of the valve oscillation. The sensor signal is fed to a monitoring controller which produces a low charge signal whenever the amplitude of valve oscillation falls below a predetermined level, thus indicating low charge conditions. The sensor is preferably a temperature sensor situated at either the outlet or the inlet of the evaporator. The system further comprises a validity evaluation controller for determining when valve oscillation is a valid indication of low charge. The validity evaluation controller analyzes a number of system operating characteristics which affect valve oscillation. If the analysis of these characteristics suggests that valve oscillation will produce a valid indication of low charge, then the validity evaluation controller will activate the monitoring controller. Otherwise, the monitoring controller will not be activated.

REFERENCES:
patent: 3698204 (1972-10-01), Schlotterbeck et al.
patent: 4167858 (1979-09-01), Kojima et al.
patent: 4463576 (1984-08-01), Burnett et al.
patent: 4651535 (1987-03-01), Alsenz
patent: 4653288 (1987-03-01), Sayo et al.
patent: 4677830 (1987-07-01), Sumikawa et al.
patent: 4745765 (1988-05-01), Pettitt
patent: 4745767 (1988-05-01), Ohya et al.
patent: 5009074 (1991-04-01), Goubeaux et al.
patent: 5150584 (1992-09-01), Tomasov et al.
patent: 5186014 (1993-02-01), Runk

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