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Analyse thermique et optimisation d’un système de fonte de glace et de neige utilisant des caloducs géothermiques flexibles ultra longs.

Thermal analysis and optimization of an ice and snow melting system using geothermy by super-long flexible heat pipes

Auteurs : WANG X., ZHU Y., ZHU M., et al.

Type d'article : Article

Résumé

An ice and snow melting system (ISMS) using shallow geothermy by super-long flexible heat pipes (SFHPs) was originally proposed. SFHPs were designed with thermally conductive polymer (TCP) intending to reduce cost and make it more conveniently to be fabricated, transported, and installed. Thermal analysis and optimization were carried out assuming ISMS is built in Nanjing city, a typical area with roasting summer and freezing winter. Results revealed that ammonia is counted as an optimal working fluid for SFHPs and the recommended dimensions of an SFHP are Ø32 × 2 mm in diameter and 70 m in total length. In addition, there is no need to upgrade the conductivity of TCP to a superior degree. High density polyethylene (HDPE) reinforced by 20% conductive filler content is selected as the pipe base material of SFHP, providing a suitable conductivity of 1.0 W/(m °C) and simultaneously maintaining a well mechanical performance. Furthermore, results show that the appropriate filling ratio for SFHPs ranges from 62% to 65%, and the heat throughput of a single SFHP at steady state is in the range of 850–1200 W varying with climatic conditions. This work will provide a comprehensive guidance to the design and application of ISMS using SFHPs heated by shallow geothermal energy.

Détails

  • Titre original : Thermal analysis and optimization of an ice and snow melting system using geothermy by super-long flexible heat pipes
  • Identifiant de la fiche : 30020820
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 112
  • Date d'édition : 05/02/2017
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2016.11.007

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