Method of determining refrigerant charge

Details Method of determining refrigerant charge Method of determining refrigerant charge

1992-02-10

1992-10-06

Tanner, Harry B.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62129, F25B 4900

Patent

active

051521520

ABSTRACT:
A method of determining if the refrigerant charge in a refrigeration system is within an acceptable range, including the step of developing a model evaporator temperature-versus-time signature for a system known to have a recommended refrigerant charge level. The model developing step includes the steps of isolating an evaporator from a space to be conditioned by the system, operating the system in a cooling mode to cool the evaporator, trapping refrigerant in the cooled evaporator to introduce an instability into the cooling cycle, and continuing the cooling mode for a time sufficient for a system having an acceptable charge level to recover from the trapping step. A test signature is then provided for a system to be checked, using steps similar to those used to develop the model signature, and the test signature is compared with the model signature to determine if the refrigerant charge is within an acceptable range.

REFERENCES:
patent: 4402191 (1983-09-01), King
patent: 4409797 (1983-10-01), King et al.
patent: 4463576 (1984-08-01), Burnett et al.
patent: 4663725 (1987-05-01), Truckenbrod et al.
patent: 4790143 (1988-12-01), Hanson
patent: 4918932 (1990-04-01), Gustafson et al.
patent: 5009074 (1991-04-01), Goubeaux et al.
patent: 5009076 (1991-04-01), Winslow
patent: 5044168 (1991-09-01), Wycoff

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