Food freezer

Details Food freezer Food freezer

1990-05-08

1991-08-27

Capossela, Ronald C.

Refrigeration

Processes

Treating an article

62332, 62381, 62434, F25D 1702

Patent

active

050422626

ABSTRACT:
A food freezer having a mechanical refrigeration system comprising first and second closed-loop fluid circuits, wherein the first fluid circuit employs carbon dioxide as its refrigerant and transfers heat to the second fluid circuit, which in turn transfers heat to the environment or to another fluid circuit. In the first fluid circuit evaporator, carbon dioxide is maintained at pressures between 60.4 psig and 120 psig. In a preferred embodiment of the invention, the freezer employs at least two separate blowers or fans for circulation of air or other gas in the freezer enclosure. One blower/fan operates continuously to maintain circulation of cold air or gas in the freezer. The other blower/fan operates intermittently or at variable speeds to vary air flow across the evaporator, and thereby increase or decrease heat transfer from the freezer interior to the first fluid circuit evaporator to maintain the freezer interior at a desired temperature or within a desired temperature range.

REFERENCES:
patent: 2402921 (1946-06-01), Sharpe
patent: 3007319 (1961-11-01), Ogden
patent: 3507128 (1970-04-01), Murphy et al.
patent: 4127008 (1978-11-01), Tyree, Jr.

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