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Etude des caractéristiques de congélation du sol autour d'échangeurs de chaleur de pompes à chaleur sol-eau, basée sur la méthode de la capacité thermique apparente.

[In Chinese. / En chinois.]

Auteurs : YANG W., SHI M., LIU G., et al.

Type d'article : Article

Résumé

In order to search the effect of soil freezing on heat exchange characteristics of ground heat exchangers in cold zone, develops a heat transfer model of soil around ground heat exchangers taking soil freezing into consideration, and solves the freezing phase change problem by apparent heat capacity method. Based on the numerical solution of the model, discusses the influences of the water content in soil, soil initial temperature, soil thermal diffusivity and Stefan number on soil temperature distribution and freezing velocity. The results indicate that the soil temperature is higher compared with unfreezing conditions and thus the heat transfer resistance is smaller, which contributes to the decrease of design length of the buried coil and system initial cost. It also proves that the increase of water content in soil is favourable to the design and operation of ground-source heat pumps. It also proves that the increase of water content in soil is favourable to the design and operation of ground-source heat pumps. Moreover, the decrease of soil thermal diffusivity and Stefan number can stay effectively the soil freezing velocity.

Documents disponibles

Format PDF

Pages : 6-10

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : [In Chinese. / En chinois.]
  • Identifiant de la fiche : 2008-2289
  • Langues : Chinois
  • Source : HV & AC - vol. 38 - n. 210
  • Date d'édition : 04/2008

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