Series secondary cooling system
OwnerThomas J. Backman, James Roomburginventors
Life of this patent
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Abstract
A secondary loop refrigeration system includes plural refrigeration zones serially connected in a secondary cooling loop using a liquid refrigerant in increasing order of operating temperatures, the secondary cooling loop being in heat exchange relationship with a primary cooling loop using direct expansion refrigerants. The primary cooling loop may be selectively isolated allowing the latent heat of the units in the zones to increase the circulating temperature of the secondary refrigerant sufficient to defrost the cooling coils.
Claims13
A refrigeration system, comprising:
- a primary refrigeration system operating in a primary loop and carrying a primary refrigerant;
- a secondary refrigeration system operating in a secondary loop and carrying a secondary liquid refrigerant;
- heat transfer means for transferring heat from said secondary loop to said primary loop;
- a plurality of cooling zones having differing temperatures to be maintained therein in serial heat transfer relationship with said secondary loop, said cooling zones being connected to said secondary loop in order of increasing temperatures.
A method of transferring heat from two zones maintain at different temperatures, comprising the steps of:
- providing a first heat sink;
- providing a first heat source;
- transferring heat between said first heat source and said first heat sink using a first heat transfer medium;
- providing a second heat sink thermally connecting said zones in series in order of increasing temperature using a non-chlorinated liquid refrigerant as a second heat transfer medium;
- and transferring heat between said second heat transfer medium and said first heat transfer medium.
Dependencies are inferred from the claim text.