Partager

Développement d'un système à pompe à chaleur sol-eau avec un échangeur de chaleur au sol utilisant les pieux des fondations d'immeubles en béton moulés sur place.

Development of a ground-source heat pump system with ground heat exchanger utilizing the cast-in-place concrete pile foundations of buildings.

Auteurs : SEKINE K., OOKA R., YOKOI M., et al.

Résumé

Ground-source (geothermal) heat pump (GSHP) systems can achieve a higher COP than conventional air-source heat pump (ASHP) systems. However, GSHP systems are not widespread in Japan because of their expensive boring costs. The authors have developed a GSHP system that uses the cast-in-place concrete pile foundations of a building as heat exchangers to reduce the initial boring cost. In this system, some U-tubes are arranged around the surface of a cast-in-place concrete pile foundation. The heat exchange capability of this system, subterranean temperature changes, and heat pump performance were investigated in a full-scale experiment. As a result, the average values for heat rejection were 186-201 W/m (per pile, 25 W/m per pair of tubes) while cooling. The average COP of this system was 4.89 while cooling, rendering this system about 1.7 times more effective in energy-saving terms than the more typical ASHP systems. The initial cost of construction per unit for heat extraction and rejection is USD 0.79/W for this system, whereas it is USD 3/W for existing standard borehole systems. Therefore, this system is expected to be commercially viable.

Détails

  • Titre original : Development of a ground-source heat pump system with ground heat exchanger utilizing the cast-in-place concrete pile foundations of buildings.
  • Identifiant de la fiche : 2009-0833
  • Langues : Anglais
  • Source : ASHRAE Transactions. 2007 Winter Meeting. Volume 113, part 1 + CD-ROM.
  • Date d'édition : 27/01/2007

Liens


Voir d'autres communications du même compte rendu (17)
Voir le compte rendu de la conférence

Indexation