Patent ID: 6408635
Filing Date: 2002-06-25
Classification: A47F,F04C,F25B,G05D,Y02B

Abstract:
A refrigeration system comprising,a refrigeration case; an evaporator disposed in said case; a condenser and compressor coupled in fluid communication with said evaporator; said condenser being disposed on said case and having means for transferring heat to ambient; said compressor comprising a pulse width modulated variable capacity compressor; a load sensor disposed in said case; a controller responsive to said load sensor and coupled to said compressor for providing a variable duty cycle control signal to said compressor whereby said compressor is modulated between loaded and unloaded states while operating to thereby adjust the operating capacity of the refrigeration system to its thermal load; and a refrigerant regulator valve in fluid communication with said evaporator and being electrically controlled by said variable duty cycle control signal to further adjust the capacity of said refrigeration system.