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Improvement of efficiency of a geothermal heat pump installation.

Number: pap. n. 679

Author(s) : AZAR P., MAATOUK C.

Summary

A vertical geothermal heat exchanger is made of a pair or two pairs of a U-shaped tubes in which circulates the coolant. The heat flux flowing from the soil to the coolant is limited by the grout physical properties. The geotechnical works hold the highest cost in geothermal installations, reducing this cost is critical to the economic viability of the system. Market grouting products thermal conductivity limit is 2.08 W.m-1.K-1 leading to high heat exchanger length. Increasing the thermal conductivity of the grout material will result in reducing the heat exchanger length. Laboratory tests were undertaken to determine the thermal conductivity of an aluminum, silica sand and cement mixture. A thermal modeling of the heat exchanger, grout and soil was conducted. The experimental results show that thermal conductivity of 5 W.m-1.K-1 can be achieved. A heat pump, coupled to the vertical geothermal heat exchanger was modeled. The simulations showed that a reduction of 25% of the heat exchanger length can be achieved theoretically for the same heat load absorbed from the soil.

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Pages: 8

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Details

  • Original title: Improvement of efficiency of a geothermal heat pump installation.
  • Record ID : 30026238
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0679

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