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Document IIF

A propos d'une variante exergétique pas réellement utilisable dans l'analyse thermodynamique des systèmes à basse température.

On not really usable exergy variant at thermodynamical analysis of low-temperature systems.

Numéro : pap. ID: 161

Auteurs : ARKHAROV A.

Résumé

Historically, two approaches to analyzing high and low temperature systems have been formed in practical application: entropic and exergetic. They are of course different. Entropy is function of state, but exergy is not. It is clear that all notions should be adequate in a united thermodynamic temperature space for all temperatures both low and high ones. From this point of view the notion of working efficiency of heat (exergy) should be defined also in the low temperature field for “decreased” heat, i.e. for heat passing from the body at higher temperature to the body at lower one. If we adopt this initial position then so called well known exergetic curve is not correct as it is relative to heat that may be taken by the flow. In the field of low temperatures the notion of exergy should be related to heat source, for example medium, that may accomplish the work when a cold receptor is available. In that case the curve of exergy is a straight line in the field of low temperatures. The author was satisfied that an entropic-statistical method is more rational to analyzing low temperature systems.

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Pages : 5 p.

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Détails

  • Titre original : On not really usable exergy variant at thermodynamical analysis of low-temperature systems.
  • Identifiant de la fiche : 30001585
  • Langues : Anglais
  • Source : Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Date d'édition : 21/08/2011

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