Renewable energy systems have become a global challenge, helping to reduce dependency on fossil fuels, to minimize the effects of climate change and to reduce green house gas emissions. Shallow geothermal energy (SGE) is one of these renewable energies that has become a sustainable alternative for conditioning buildings and infrastructure in many regions of the world. New solutions have recently been developed, including energy geo-structures, where SGE systems are coupled with heat exchangers in the foundations. The efficiency of these systems depends on a number of factors, among which the thermal properties of the soil and the design of the heat exchanger are major influences. The aim of this research work is to quantify and valorize this near-surface energy (shallow geothermal energy) using ground heat exchanger coupled to heat pumps. A transient numerical model based on the finite element method using the “COSMOL Multiphysics” software is established, taking into account the various thermal properties of the soil and the atmosphere-soil-heat exchanger interactions. The aim is to define the actual surface temperature during an annual reference period and the energy transferred to the building for use in heating and cooling in Algeria.

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Numerical Simulation of a Shallow Ground Heat Exchanger Installed in a Geothermal Site in the Region of Algeria

  • Kheira Belhamideche,
  • Nadia Laredj,
  • Mustapha Maliki,
  • Missoum Hanifi,
  • Djihad Bennaceur,
  • Mahi Eddine Brahimi

摘要

Renewable energy systems have become a global challenge, helping to reduce dependency on fossil fuels, to minimize the effects of climate change and to reduce green house gas emissions. Shallow geothermal energy (SGE) is one of these renewable energies that has become a sustainable alternative for conditioning buildings and infrastructure in many regions of the world. New solutions have recently been developed, including energy geo-structures, where SGE systems are coupled with heat exchangers in the foundations. The efficiency of these systems depends on a number of factors, among which the thermal properties of the soil and the design of the heat exchanger are major influences. The aim of this research work is to quantify and valorize this near-surface energy (shallow geothermal energy) using ground heat exchanger coupled to heat pumps. A transient numerical model based on the finite element method using the “COSMOL Multiphysics” software is established, taking into account the various thermal properties of the soil and the atmosphere-soil-heat exchanger interactions. The aim is to define the actual surface temperature during an annual reference period and the energy transferred to the building for use in heating and cooling in Algeria.