Cascade refrigeration system

Details Cascade refrigeration system Cascade refrigeration system

1991-12-10

1992-12-15

Tapolcai, William E.

Refrigeration

Automatic control

Refrigeration producer

62335, F25B 700

Patent

active

051706393

ABSTRACT:
A cascade vapor compression refrigeration system having a high stage and a low stage, each stage having a compressor, evpaorator, condenser and expansion device. The high-stage evaporator is in heat transfer relationship with the low-stage condenser. There is further provided an air-to-refrigerant heat exchange element, including means for moving air over the element. The heat exchange element is connected in the discharge line of the low-stage system and is positioned to be subject to a fluctuating outoor ambient temperature. Control means are provided which are responsive to some characteristic related to outdoor temperature whereby high-stage compressor operation is permitted when the outdoor ambient is below a preset temperature and high-stage compressor operation is prevented when the outdoor ambient is above a preset temperature.

REFERENCES:
patent: 2717765 (1955-09-01), Lawler, Jr.
patent: 2796743 (1957-06-01), McFarlan
patent: 2841962 (1958-07-01), Richards
patent: 3733845 (1973-05-01), Lieberman
patent: 4402189 (1983-09-01), Schaeffer
patent: 4484449 (1984-11-01), Muench
patent: 4777805 (1988-10-01), Hashizume
patent: 4850199 (1989-07-01), DiNovo et al.
patent: 5105633 (1992-04-01), Briggs

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