An updated ground thermal properties database for GSHP applications

Santa, Giorgia Dalla; Galgaro, Antonio; Sassi, Raffaele; Cultrera, Matteo; Scotton, Paolo; Mueller, Johannes; Bertermann, David; Mendrinos, Dimitrios; Pasquali, Riccardo; Perego, Rodolfo; Pera, Sebastián; Sipio, Eloisa Di; Cassiani, Giorgio; Carli, Michele De; Bernardi, Adriana

doi:10.1016/j.geothermics.2019.101758

Cited by 94 publications

(39 citation statements)

References 39 publications

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“…GSHE can be associated with a (i) vertical closed-loop system (borehole heat exchanger, BHE), or an (ii) open-loop system (groundwater heat exchanger, GWHE). Differently from the GWHE whose installation is strictly related to the hydrogeological framework of the area [3,8], the BHE can be developed virtually anywhere [9,10], although a careful monitoring is needed to balance the exploitation of the heat reservoir during winter and summer seasons to ensure the longevity of the system and avoid long-term depletion of the ground thermal reservoir [11]. Despite this versatility, the installation of BHE requires a detailed knowledge of the geological, hydrogeological and thermophysical properties of the ground for its exploitation.…”

Section: Introductionmentioning

confidence: 99%

Defining the Shallow Geothermal Heat-Exchange Potential for a Lower Fluvial Plain of the Central Apennines: The Metauro Valley (Marche Region, Italy)

Taussi

Borghi²,

Gliaschera³

et al. 2021

Energies

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In this work we assessed the shallow geothermal heat-exchange potential of a fluvial plain of the Central Apennines, the lower Metauro Valley, where about 90,000 people live. Publicly available geognostic drilling data from the Italian Seismic Microzonation studies have been exploited together with hydrogeological and thermophysical properties of the main geological formations of the area. These data have been averaged over the firsts 100 m of subsoil to define the thermal conductivity, the specific heat extraction rates of the ground and to establish the geothermal potential of the area (expressed in MWh y−1). The investigation revealed that the heat-exchange potential is mainly controlled by the bedrock lithotypes and the saturated conditions of the sedimentary infill. A general increase in thermal conductivity, specific heat extraction and geothermal potential have been mapped moving from the coast, where higher sedimentary infill thicknesses have been found, towards the inland where the carbonate bedrock approaches the surface. The geothermal potential of the investigated lower Metauro Valley is mostly between ~9.0 and ~10 MWh y−1 and the average depth to be drilled to supply a standard domestic power demand of 4.0 kW is ~96 m (ranging from 82 to 125 m all over the valley). This investigation emphasizes that the Seismic Microzonation studies represent a huge database to be exploited for the best assessment of the shallow geothermal potential throughout the Italian regions, which can be addressed by the implementation of heating and cooling through vertical closed-loop borehole heat exchanger systems coupled with geothermal heat pumps.

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Section: Introductionmentioning

confidence: 99%

Defining the Shallow Geothermal Heat-Exchange Potential for a Lower Fluvial Plain of the Central Apennines: The Metauro Valley (Marche Region, Italy)

Taussi

Borghi²,

Gliaschera³

et al. 2021

Energies

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“…They use the natural thermal energy of the subsurface stored at shallow depths for space heating/cooling and snow-melting, among other uses [5][6][7]. It is reported that the efficiency of thermal exchange of the closed loop system depends on thermal conductivity, heat capacity, and subsurface temperature profile [8]. Sensitivity analysis also showed the results that both the design parameters and operational parameters have a major influence on the GSHP performance [9].…”

Section: Introductionmentioning

confidence: 99%

Proposal for a Method Predicting Suitable Areas for Installation of Ground-Source Heat Pump Systems Based on Response Surface Methodology

Kaneko¹,

Tomigashi²,

Ishihara³

et al. 2020

Energies

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The installation potential of ground-source heat pump (GSHP) systems has been studied based on the spatial interpolation of numerical simulation results using ground heat exchanger (GHE) models. This study is the first to create an estimation formula for the heat exchange rate (HER) to obtain a solution equivalent to the numerical analysis results considering the average method when supplying three-dimensional (3D) hydrogeological information that affects the HER to a two-dimensional (2D) map. It was found that the main factors affecting the HER were groundwater flow velocity, subsurface temperature, and thermal conductivity. The response surface methodology was utilized to approximate the HER using the above-mentioned three parameters. The estimated HER showed very strong agreement with that calculated by the GHE models. The application of the estimation formula to the simulation of the 3D groundwater flow and heat transport model of the Sendai Plain (Japan) better reflects the hydrogeological information of the regional model than conventional maps. The proposed method improves the spatial resolution of maps and allows for the easy creation of the HER estimation formula.

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Section: Discussionmentioning

confidence: 99%

“…As mentioned before, it is important for reliability of the data to always consult local geological conditions. Creating regional thermal properties databases that integrate data from the whole country/region should be one of the future concerns [35]. Figure 8 presents the shallow geothermal potential of Poland and the result of processing, analysis and interpretation of subsurface data from the thematic databases, atlases and serial maps gathered in the archives of the Polish Geological Institute National Research Institute.…”

Section: Discussionmentioning

confidence: 99%

Serial Laboratory Effective Thermal Conductivity Measurements of Cohesive and Non-cohesive Soils for the Purpose of Shallow Geothermal Potential Mapping and Databases—Methodology and Testing Procedure Recommendations

2020

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The article presents the methodology of conducting serial laboratory measurements of thermal conductivity of recompacted samples of cohesive and non-cohesive soils. The presented research procedure has been developed for the purpose of supplementing the Engineering–Geology Database and its part–Physical and Mechanical Properties of Soils and Rocks (abbr. BDGI-WFM) with a new component regarding thermal properties of soils. The data contained in BDGI-WFM are the basis for the development of maps and plans for the assessment of geothermal potential and support for the sustainable development of low enthalpy geothermal energy. Effective thermal conductivity of soils was studied at various levels of water saturation and various degrees of compaction. Cohesive soils were tested in initial moisture content and after drying to a constant mass. Non-cohesive soils were tested in initial moisture, fully saturated with water and after drying to a constant mass. Effective thermal conductivity of non-cohesive soils was determined on samples mechanically compacted to the literature values of bulk density. Basic physical parameters were determined for each of the samples. In total, 120 measurements of thermal conductivity were carried out, for the purposes of developing the guidelines which allowed statistical analysis of the results. The results were cross-checked with different measuring equipment and with the literature data.

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An updated ground thermal properties database for GSHP applications

Cited by 94 publications

References 39 publications

Defining the Shallow Geothermal Heat-Exchange Potential for a Lower Fluvial Plain of the Central Apennines: The Metauro Valley (Marche Region, Italy)

Defining the Shallow Geothermal Heat-Exchange Potential for a Lower Fluvial Plain of the Central Apennines: The Metauro Valley (Marche Region, Italy)

Proposal for a Method Predicting Suitable Areas for Installation of Ground-Source Heat Pump Systems Based on Response Surface Methodology

Serial Laboratory Effective Thermal Conductivity Measurements of Cohesive and Non-cohesive Soils for the Purpose of Shallow Geothermal Potential Mapping and Databases—Methodology and Testing Procedure Recommendations

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