Refrigeration – Processes – Fractionally solidifying a constituent and separating the same
Patent
1990-07-31
1991-07-16
Tapolcal, William E .
Refrigeration
Processes
Fractionally solidifying a constituent and separating the same
62124, C02F 122
Patent
active
050321579
ABSTRACT:
A refrigeration system having two alternatively actuable condensers operating at different condensing temperatures and pressures includes a compensatory metering arrangement for preventing significant changes of refrigerant fluid flow rate to the system evaporator when the system switches from one condenser to the other. Compensation is effected by changing the size of the metering orifice as necessary to accommodate the different condenser operating pressures. In one embodiment a thermostatic expansion valve is modified to include a damping factor preventing rapid changes in the valve position. Damping is achieved with a liquid-filled damping chamber having a damping diaphragm as one wall secured to the valve actuator rod. Opening of the valve requires the damping diaphragm to compress the liquid which is permitted to leak from the damping chamber at a controlled rate to slow the valve actuation rate. The system has particular utilization in the formation and collection of purified ice pieces from unpurified water and the formation of purified water by the selective melting of ice pieces using rejection heat from one of the alternatively operative condensers. In an alternative system embodiment, electrical heating of the collection bin is employed to melt ice pieces.
REFERENCES:
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patent: 3398805 (1968-08-01), Waller
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patent: 3885937 (1975-05-01), Norris
patent: 4262489 (1981-04-01), Sakamoto
patent: 4370865 (1983-02-01), Hibrino et al.
Tapolcal William E .
Thermadyne, Inc.
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