Patent attributes
A refrigeration system both cools and heats frozen dessert mix in at least two hoppers and at least two freezing cylinders. A liquid line solenoid valve at the inlet of each of the hoppers and the freezing cylinders controls the flow of refrigerant from the condenser. A hot gas solenoid valve at the inlet of each of the hoppers and the freezing cylinders controls the flow of hot refrigerant from the compressor. The system further includes a hot gas bypass valve that is opened when only the hoppers are being cooled to provide additional compressor load. An EPR valve proximate to the hopper discharges varies the temperature of the refrigerant exchanging heat with the mix in the hoppers. A CPR valve controls the inlet pressure of the compressor by reducing the amount of hot refrigerant flowing into the compressor suction. A TREV valve injects liquid refrigerant to the compressor suction to control excessive compressor discharge during the cool cycle.
