accumulation de chaleur latente
- Domaine
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- énergie
- Date
Définition :
Méthode d'accumulation de chaleur basée sur le changement d'état de certains composés.
Note :
Parmi les substances que l'on peut utiliser pour stocker la chaleur, on peut citer le thiosulfate de sodium, le carbonate de sodium, le chlorure ferrique et certaines cires.
Terme :
- accumulation de chaleur latente n. f.
Traductions
-
anglais
Date :Définition
A method of heat storage based on the use of the latent heats of fusion or vaporization of selected compounds. Pure compounds melt and boil at well defined temperatures, and this characteristic can be employed in latent heat storage, also termed phase change media (PCM) storage, for temperature stabilization. PCM storage media offer high storage densities but have two major drawbacks. Since the medium must solidify progressively as it gives out heat, a layer of poorly-conducting solid phase tends to form around the heat extraction coils leading to poor system performance. Secondly, thermal contraction of the solid phase on cooling tends to form insulating air pockets around the output coils.
Note :
Several approaches are under development to solve these problems, including the use of mechanical agitation and encapsulation of the material. Substances under investigation for use in latent heat storage systems include sodium thiosulphate, sodium carbonate, ferric chloride and various waxes, all of which have fairly low melting points (between 35° and 50 °C) suitable for applications in connection with solar heating. A major consideration in such systems is the cost of the storage material. Higher temperature PCM systems are under development for industrial use.
Termes :
- phase change media storage
- PCM storage
Terme associé :
- latent heat storage