Process for the manufacture of a unit containing a solid active

Details Process for the manufacture of a unit containing a solid active Process for the manufacture of a unit containing a solid active

1998-01-07

1999-03-02

Doerrler, William

Refrigeration

Refrigeration producer

Sorbent type

220589, 156172, 156180, F25B 3504, B01J 304, F16J 1200

Patent

active

058756485

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process for the manufacture of a unit containing a solid active material which can be used for the production of cold, the unit thus obtained and a refrigerating device comprising at least one such unit.
There are many known systems for producing cold which are based on the reaction of a solid active material such as a metal salt with a gas such as ammonia, or else on the desorption of a gas, such as carbon dioxide or ammonia, previously adsorbed and/or absorbed in a solid material such as active carbon, active carbon fibers, zeolites, expanded graphite and the like.
In practical embodiments of these systems the solid active material is generally placed in the more or less packed state in a metal container or vessel connected by a conduit to the other components of the system. In operation the negative calories generated in the active material are transmitted first to the container and then, from there, to the fluid (for example air) to be cooled by heat exchange components such as metal fins mounted on the container. This kind of structure is relatively inefficient thermally because the transfer of the negative calories from the active material toward the container takes place badly as a result of a mediocre physical contact between the internal surface of the container and the active material which it contains. There is therefore a need for a unit containing an active solid material which can be used for the production of cold, exhibiting improved performance.
The invention is aimed especially at providing a process for the manufacture of such an improved unit.
The invention is based on the concept consisting in forming the container directly around the active material rather than first forming the container and subsequently filling it with the active material.
More precisely, the invention relates to a process for the manufacture of a unit including a pressure-resistant container provided with at least one connecting orifice, and an active solid material contained in said container, in which the container is formed directly on a preformed body of active material, the said container being made of a material which has a thermal conductivity higher than 18 W/m.K.
The container can be made by various techniques, such as encapsulation, but is preferably formed by filament winding techniques.
The technique of filament winding is well known and was developed more than 20 years ago by NASA. This technique is commonly employed for producing various articles such as compressed-air cylinders for divers, or tubes. This technique consists in winding around a former forming a mandrel a continuous filament or band, for example made of glass fiber, carbon fiber, aramid fiber, ceramic fiber or metal fiber, usually preimpregnated with an appropriate binder such as a resin in the curable B state, for example a polyester resin, an epoxy resin, a polyamide resin, a silicone resin or a phenolic resin and then, once the winding is finished, in curing the resin to form the desired article. Alternatively, the filament may be coated with a curable resin just before it is wound onto the mandrel, or else a filament can be wound "dry" and the resulting article can be impregnated under pressure with binder resin, and the resin can be finally cured. Another alternative form consists in employing a thermoplastic resin, in which case the consolidation of the article requires the application of heat and pressure. The winding may be of the circumferential, polar or helical type or may combine two or more of these types.
Numerous articles and patents dealing with filament winding are available in the published literature, and various machines and materials for implementing it are available commercially. It therefore does not appear necessary to describe this technique in greater detail here.
For the purpose of the invention, however, it is appropriate to choose a filament/binder pair which forms a composite material which has good thermal conductivity, namely higher than 18 W/m.K, this value corresponding approx

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