Refrigeration – Storage of solidified or liquified gas – Liquified gas transferred as liquid
Patent
1996-06-28
1998-05-12
Capossela, Ronald C.
Refrigeration
Storage of solidified or liquified gas
Liquified gas transferred as liquid
62 70, 2221291, 261151, 261DIG7, F17C 902
Patent
active
057492336
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a method and a device according to the respective preambles of claim 1 and claim 6.
A method according to the above is previously known from the applicants own SE-B-464 761, wherein carbon dioxide is introduced below the liquid surface into the tank which holds the liquid. The introduced carbon dioxide thereby expands and provides thus cooling of the liquid. At the same time carbonating of the liquid is obtained. A method according to SE-B-464 761 has proved to function well with respect to providing an economic and efficient solution to the problem of carbonating and cooling liquids. In certain difficult situations, however, as e.g. in connection with large discharges of carbonated liquid from the tank, necessitating cooling of a relatively large amount of liquid fed into the tank, inadequate control of the ice formation within the tank will occur. This may lead to unwanted fluctuation in the output temperature and possibly also tendency of through freezing the liquid in the tank. By the fact that the device according to the known art lacks a buffer in the form of an ice bank which is located at a specific place in the tank, said fluctuations are accentuated.
It is a purpose of this invention to provide a solution to the above problems which solution, however, benefits from the advantages of the system according to SE-B-464 761, namely using one single system for cooling and carbonating.
The above purpose is achieved by the method and the device of the above mentioned kind being characterized by the features of the respective characterizing portions of claims 1 and 6.
By the features of claims 1 and 6 it is thus achieved that a controlled ice bank may be formed in the area where the liquid is thermally connected to the expansion room. By thus using a system where indeed carbon dioxide is used for cooling as well as carbonating, but where the expansion essentially takes place in a room which is separate from the liquid to be cooled, the formation of an uncontrolled slush of ice of microscopic or larger ice crystals is avoided, thus achieving essentially better liquid carbonating control. A complication with uncontrolled ice mass in the liquid is that essentially no carbonating may be obtained in the ice phase of the water. An excellent energy exchange between gas and liquid is also obtained because the gas after expansion being introduced into the liquid. Gas having been expanded in the expansion room will thus possibly comprise an energy deficiency , i.e. be under-cooled when it contacts the liquid, which contributes to the cooling of the liquid. The system according to the invention is thus energy saving and presents therefore an environmentally friendly alternative, as well as in view of the fact that carbon dioxide is used and not commonly used freon as the cooling agent.
By the feature in claim 2 and 14, respectively, particularly effective carbonating is achieved as well as further possibilities of using the remaining energy deficiency of the introduced carbon dioxide.
The features according to claim 4 and 16, respectively, allow in a per see known way a possibility of controlling the carbonating independently of if cooling has been initiated.
According to the feature in claim 5 and 17, respectively it is achieved that cooling may be initiated without all carbon dioxide used for that purpose being introduced into the liquid, whereby an unwanted excess of carbon dioxide in the liquid may be avoided.
The feature according to claim 7 brings about manufacturing of the device being possible in a very simple and economic way.
The feature according to claim 8 allows the use of a "clean" tank, where the ice bank is formed against the outer wall of the tank.
The feature according to claim 11 brings about cost effective use of an easily manufactured element forming the expansion room.
The feature according to claim 12 comprises a preferred construction of the device according to the invention allowing a particularly simplified and thus economic manufacture of the device.
By the feature
REFERENCES:
patent: 2195449 (1940-04-01), Delen
patent: 4011733 (1977-03-01), Kuckens et al.
patent: 5140822 (1992-08-01), Gupta
patent: 5160461 (1992-11-01), Durrows
patent: 5184942 (1993-02-01), Deininger et al.
patent: 5231851 (1993-08-01), Adolfsson
Derwent's abstract, No. 83-831592/48, weeek 8348, Abstract of SU, 992341 (Novch Poly), 5 Feb. 1983.
Capossela Ronald C.
Post-Mix Equipment AB
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