Patent ID: 7752854

Claim:
A method comprising: receiving a condenser signal including at least one of a condenser current signal corresponding to an electrical current of a condenser fan of a condenser of a refrigeration system, a condenser fan power signal corresponding to an electrical power of said condenser fan, and a condenser fan control signal for controlling said condenser fan; receiving a compressor signal including at least one of a compressor current signal corresponding to an electrical current of a compressor of said refrigeration system, a compressor power signal corresponding to an electrical power of said compressor, and a compressor control signal for controlling said compressor; receiving a discharge signal corresponding to at least one of a discharge pressure of said compressor and a discharge temperature of said compressor; calculating a saturation temperature based on said discharge signal; calculating a thermal efficiency of said condenser of said refrigeration system based on said condenser signal, said compressor signal, and said saturation temperature; comparing said thermal efficiency to an efficiency threshold; and generating a notification based on said comparison.