Apparatus and method for determining refrigerant charge level

Details Apparatus and method for determining refrigerant charge level Apparatus and method for determining refrigerant charge level

2007-01-18

2009-12-15

Jules, Frantz F (Department: 3744)

Refrigeration

Automatic control

Withdrawing or adding refrigerant from or to normally closed...

C062S126000, C062S127000, C062S129000

Reexamination Certificate

active

07631508

ABSTRACT:
A method and apparatus for non-invasively determining a charge level of a refrigerant in a vapor-compression cycle system. The method and apparatus monitor the system while the system is operated to ascertain that the system is operating at approximately steady-state. The superheat and the subcooling of the system are then determined at the suction line and at the liquid line, respectively, and the refrigerant charge level is calculated based on the determined subcooling, the determined superheat, and rated operating conditions of the system, including rated refrigerant charge level, rated liquid line subcooling, and rated suction line superheat.

REFERENCES:
patent: 5239865 (1993-08-01), Salzer et al.
patent: 6101820 (2000-08-01), Cheballah
patent: 6128910 (2000-10-01), Faircloth
patent: 6308523 (2001-10-01), Scaringe
patent: 6571566 (2003-06-01), Temple et al.
patent: 6658373 (2003-12-01), Rossi et al.
patent: 7114343 (2006-10-01), Kates
patent: 2003/0055603 (2003-03-01), Rossi et al.

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