C-Therm Blog

Geothermal Exchange Mapping

Researchers from C.N.R. (National Research Council) Institute of Geosciences and Earth Resources  in Italy recently published work on C-Therm’s TCi Thermal Conductivity Analyzer’s application in testing rocks and sediment for the purpose of mapping the optimal placement of geothermal exchange systems.

Geophysical data is powerful for determining underground conditions and providing useful information for planning geothermal exploitation. Ground source heat pump systems (GSHPs) coupled with the ground by means of borehole heat exchangers (BHEs) have gained increasing populariy in Europe as they are both efficient and  an environmentally friendly technology for heating and cooling purposes.

The geo-exchange map below was calculated using a specific algorithm, implemented in the frame of VIGOR Project, able to combine ground and GSHP (Groud Source Heat Pump) parameters in order to obtain the energy exchanged ability in a closed-loop geothermal system. In order to define the thermal conductivity of rocks and sediments that were representative of the main lithological units, several samples were collected and analysed in the laboratory, both in dry and wet conditions, using a thermal analyser system (C-Therm TCi) following the Modified Transient Plane Source method (Di Sipio et al. 2013). This non-invasive, highly accurate and rapid technique provides a detailed overview of the thermal nature of the sample material from the thermal conductivity and effusivity measured from the slope of the voltage drop plot (Cha et al. 2012).Geothermal Exchange Mapping with Thermal Conductivity Testing Results

The geo-exchange map provides a clear picture of the areas where heat exchange is favoured by geological conditions.

For a full copy of the report please visit here.

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