Patent ID: 7481069
Filing Date: 2009-01-27
Classification: F25B,Y02B

Abstract:
1. A refrigerant system comprising: a compressor delivering a compressed refrigerant downstream to a condenser, refrigerant passing from said condenser to an expansion device, and from said expansion device to an evaporator, refrigerant passing from said evaporator back to said compressor, a fluid-moving device for moving fluid over said condenser, and a fluid-moving device for moving fluid over said evaporator, said fluid-moving devices for said condenser and said evaporator, and said compressor all being provided with an electric motor, and at least one of said electric motors being provided with a variable speed drive; and a control for said refrigerant system, said control being operable to control said variable speed drive, said variable speed drive being operable to change the frequency of operation of said at least one electric motor, and to independently change the voltage supplied to said at least one electric motor, and said control determining optimum values for said frequency and said voltage, and driving said at least one electric motor to said desired frequency and said desired voltage.