Refrigeration – Automatic control – Diverse – cascade or compound refrigeration-producing system
Reexamination Certificate
2005-10-04
2005-10-04
Norman, Marc (Department: 3744)
Refrigeration
Automatic control
Diverse, cascade or compound refrigeration-producing system
C062S225000, C062S228500, C236S0010EA
Reexamination Certificate
active
06951116
ABSTRACT:
Disclosed are an air conditioner in which one or more compressors are operated so that the refrigerant compression capacity of the operating compressor(s) is variably changed in accordance with a cooling or heating load for cooling or heating air in a room, and a method for controlling an electronic expansion valve of the air conditioner. The air conditioner comprises a plurality of compressors for compressing a refrigerant; a condenser for condensing the refrigerant; an electronic expansion valve for expanding the refrigerant; an evaporator for evaporating the refrigerant; a direction change valve for changing the flow direction of the refrigerant; a refrigerant pipe for connecting the compressors, the condenser, the electronic expansion valve, the evaporator and the direction change valve; and a microcomputer for controlling the operation of the air conditioner, wherein an opening degree of the electronic expansion valve is controlled so that a current degree of superheat coincides with a target degree of superheat set in consideration of the refrigerant compression capacity of operating compressor(s) and an outdoor temperature. The air conditioner prevents the refrigerant in a liquid state from being introduced into the compressor(s) and the compressor(s) from overheating, and rapidly eliminates the cooling or heating load.
REFERENCES:
patent: 5628201 (1997-05-01), Bahel et al.
patent: 6276148 (2001-08-01), Shaw
patent: 6321549 (2001-11-01), Reason et al.
patent: 6564565 (2003-05-01), Hwang
patent: 10318612 (1998-12-01), None
Hwang Yoon Jei
Kim Cheol Min
Lee Won Hee
Greenblum & Bernstein P.L.C.
LG Electronics Inc.
Norman Marc
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