Patent ID: 9032750
Filing Date: 2015-05-19
Classification: F04C,F25B,Y02B

Abstract:
1. A variable efficiency refrigeration system having a variable efficiency screw compressor, comprising: an inlet port to draw a refrigerant into the compressor; a pair of helically grooved rotors in fluid communication with the inlet port to compress the refrigerant from a first low pressure to a second higher pressure; a discharge port in fluid communication with the rotors that receives the refrigerant at the second higher pressure and discharges the refrigerant; a power source powering the compressor; a control panel modulating the power source; a condenser in fluid communication with the compressor that condenses the refrigerant gas at the second higher pressure to a pressurized liquid; an evaporator in fluid communication with the condenser and with the compressor; an expansion valve positioned between the condenser and the evaporator, wherein the expansion valve receives the condensed pressurized refrigerant fluid and expands it to a lower pressure mist of gas and liquid for the evaporator; and a plug positioned within the discharge port and manually movable within the discharge port from the exterior of the compressor from a first position to a second position, the plug providing the discharge port with a variable volume, in which the volume is at a maximum in the first position and in which the volume is at a minimum in the second position, the plug being movable to any intermediate position between the first position and the second position to provide an intermediate volume.