Heat exchange – Regenerator – Heat collector
Patent
1996-01-22
2000-03-21
Atkinson, Christopher
Heat exchange
Regenerator
Heat collector
2989006, 285158, 285417, F28D 1700
Patent
active
060391103
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a heat accumulator, in particular a latent heat accumulator. More particularly, it relates to a heat accumulator which has an interior envelope with an accumulator core and an exterior envelope surrounding the interior envelope at a distance to form an insulating chamber, with lines passing through the insulating chamber.
In a known heat accumulator of this type (DE-OS 40 07 004), the line sections led through the insulation chamber are made of plastic, because its heat conducting capability is less than that of metal lines. For comparison, continuous, one-piece aluminum pipes, for example, can be cited as metal lines. The design of the line section in plastic has many disadvantages. For one, no permanent temperature stability is assured, particularly if the heat-conveying medium is at high temperature during operation. It is furthermore disadvantageous that line sections made of plastic cannot be fastened sealingly, preferably vacuum-sealed, at all or only with great effort and doubtful results on the interior envelope and at the place where these line sections pass through the exterior envelope, fastened on the outer envelope. With vacuum-insulated heat accumulators, the material of the line sections must be sealed against diffusion, i.e. suitable for a vacuum. Plastic cannot lastingly meet such requirements. In addition, plastic can also not withstand the prevailing mechanical stresses, for example oscillation stresses, in the long run.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a heat accumulator, in particular a latent heat accumulator, which avoids the disadvantages of the prior art.
More particularly, it is an object of the present invention to provide a heat accumulator, in particular a latent heat accumulator, wherein the heat losses caused by the inflow and outflow lines can be reduced in as simple as possible a way, as well as the manufacture of the heat accumulator as cost-effectively as possible.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a heat accumulator of the above mentioned general type in which in the lines passing through the insulating chamber and having a line section extending in the insulating chamber and made of a material with reduced heat-conductive capability the respective line section is constituted of a metal having a low heat conducting capability. It is possible in this way to reduce the heat losses in the area of the line sections because of low heat-conducting capability, wherein the metallic material itself is vacuum-tight and at the same time makes possible a welded or soldered connection in a simple way, and thus a cost-effective manufacture of the heat accumulator. It is furthermore advantageous that the respective metallic line sections can also lastingly withstand high temperatures of the heat-conveying medium and great mechanical stresses and make lasting vacuum-tight connections possible.
In accordance with a further features of the present invention, the metal with reduced heat conducting capability can be welded or soldered, and it can be a special steel, for example a rust and acid resistance chromium nickel alloy steel. The respective line area can be provided with a connecting sleeve in the area adjoining the interior envelope or exterior envelope to fasten on the corresponding envelope. The connecting sleeve can be made of aluminum. The envelopes can be also made of aluminum. Particularly in those cases, where the components of the heat accumulator consist of aluminum and the connection sleeves present in each end area of each line section also consist of aluminum, an aluminum/aluminum weld connection or solder connection of the lines is possible in a simple manner, in particular of their connection sleeves at the ends, and of the interior envelope, for example a collecting reservoir, as well as of the outer envelope. A considerable reductio
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Flinn et al., Engineering Materials and their applications, 1975, pp. 158-161.
Atkinson Christopher
Laengerer & Reich GmbH & Co.
Striker Michael J.
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