Cascade refrigeration system
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United States of America Patent
Stats
-
Dec 15, 1992
Grant Date -
N/A
app pub date -
Dec 10, 1991
filing date -
Dec 10, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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