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Analyse du transfert de chaleur de l’échangeur de chaleur souterrain à double tube en U d'un système de pompe à chaleur géothermique en boucle fermée utilisé à des fins de refroidissement des locaux dans des conditions climatiques indiennes.

Heat transfer analysis of double U-tube ground heat exchanger of closed loop ground source heat pump system during space cooling application for Indian climatic conditions.

Numéro : pap. n. 622

Auteurs : KUMAR S., PANDIT J., MURUGESAN K.

Résumé

Use of ground source heat pump system (GSHP) for spce cooling application results in significant reduction in electricity consumption as the temperature of heat rejection (ground) is lower than the ambient.The main focus of the present research is to investigate the heat transfer and temperature variation of heat transfer fluid in a double U-tube ground heat exchanger (GHE) of a 5-ton GSHP system installed in IIT Roorkee, Roorkee in the northern region of India. Thermal properties of the ground formation were obtained using thermal response test (TRT). An analytical model has been developed using thermal resistance concept for the computation of temperature and heat transer variation along the four legs of the GHE during space cooling operation. Results indicate 77% of heat is exchanged in the first U-tube and 23% in the second U-tube. Results are reported by assuming constant borehole temperature of 26°C. Comparison between theoretical prediction and experimental results obtained for heat transfer through GHX indicates that the theoretical model could predict the heat transfer rate through the GHX with 2 to 27% error depending on the inlet temperature of heat transfer fluid in the borehole.

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Pages : 8

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Détails

  • Titre original : Heat transfer analysis of double U-tube ground heat exchanger of closed loop ground source heat pump system during space cooling application for Indian climatic conditions.
  • Identifiant de la fiche : 30026232
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0622

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