Heat exchange – Regenerator – Heat collector
Patent
1997-09-29
1998-12-29
Lazaros, Ira S.
Heat exchange
Regenerator
Heat collector
257 70, F28D 1700
Patent
active
058530452
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a heat and/or cold accumulator-exchanger device intended to receive a storage agent having a high liquid-solid transformation latent heat, in particular water, of the filling-body type.
BACKGROUND OF THE INVENTION
Plants are known which require the means of producing heat or cold in variable amounts during a given period, these plants being designed so as to reduce, to a significant extents the power of the equipment intended to produce the heat and/or cold. An example of such plants is given in French Patent FR-A-2,469,678.
Such plants always include heat and/or cold accumulator-exchangers. Some of these accumulator-exchangers, called filling-body accumulator-exchangers, consist of a storage tank which itself contains filling bodies in which the heat and/or cold is stored in offpeak periods and then redistributed in peak periods using a liquid heat-transfer medium (water, glycol solution, etc.) which carries out exchange by flowing through the tank between the filling bodies. The filling bodies of these accumulator-exchangers generally contain a material having a high liquid-solid transformation latent heat (water, salt hydrates, paraffins, etc.) which is encapsulated in a shell of very generally spherical shape, this shape being preferred because of its symmetry properties, of its ease of implementation in storage tanks, and of the uniform flow of the heat-transfer medium responsible for the heat transfer which it provides. Examples of such plants are given in U.S. Pat. No. 2,525,261, French Patent FR-A-2,244,969 or European Patent EP-A-076,884.
Many filling bodies intended for these accumulator-exchangers of known type which make it possible, in addition to storing a large amount of heat and/or cold in a restricted volume, to absorb without any damage the variations in volume which result from the liquid-solid phase change of the high transformation-latent-heat materials contained in the shells of such bodies, are known. These are: possess a flexible structure, such as those described in U.S. Pat. No. 2,525,261 or European Patent EP-A-0,277,847; possess an elastic structure, such as those described in French Patent FR-A-1,104,400; and deformable structure and a pocket of air or a compressible material introduced into the filling body, such as those described in German Patent DE 30 05 450 A1 or European Patent EP-A-076,884.
The technique used for making the filling bodies introduced into accumulator-exchangers, which consists in manufacturing a plastic shell, in filling it with the storage material in the liquid,state and then in closing it in a sealed manner, is known. All the shells of the filling bodies are made of plastic since other materials (in particular metals) lead to excessive manufacturing costs. Because of the large quantities of filling bodies necessary, these shells are manufactured in high volume using the technique of extrusion-blow moulding since this technique gives lower manufacturing costs than other known techniques, such as injection moulding or injection-blow moulding. The technique of extrusion-blow moulding is a very widely used technique; it consists in projecting, by blowing compressed air, an extruded tube of softened plastic into the cavity of a mould whose geometrical shape has the shape of the body which it is desired to obtain. During cooling of the mould, the plastic deposited on the internal wall of the latter cools and then hardens, and the mould is then opened so as to release the moulded body. However, this technology, which is intrinsically simple, is relatively restrictive and limiting in the choice of the shapes which it allows; this is because, on the one hand, all parts of the mould must necessarily be seen directly from the plastic tube, with the risk that concealed parts do not receive material during blowing, the back-tapers must be minimal so that the components can be unmolded without damaging them.
It is also well-known that the thermodynamic properties of an accumulator-exchanger are determined b
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patent: 4565242 (1986-01-01), Yano et al.
patent: 4681154 (1987-07-01), Yano et al.
patent: 4768579 (1988-09-01), Patry
Patry Jean
Reboul Claude
Atkinson Christopher
Lazaros Ira S.
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