REVERSE CYCLE AT TWO BOILING POINTS AND REFRIGERATING MACHINE Russian patent published in 1997 - IPC

FIELD: refrigerating engineering. SUBSTANCE: refrigerating machine has two independent closed low-pressure and high-pressure loops of compressor provided with two suction branch pipes of different pressures and two delivery branch pipes. Low-pressure loop is formed by compressor delivery branch pipe, condenser, low-pressure control valve and low-pressure compressor suction branch pipe connected in series. High-pressure loop is formed by delivery branch pipe, condenser, high-pressure control valve, high-pressure evaporator and high-pressure compressor suction branch pipe. Compressor may be of vortex type; additional delivery branch pipe is located in area of splitter of compressor working chamber. EFFECT: enhanced efficiency. 4 cl, 1 dwg