Assessment and mapping of the closed-loop shallow geothermal potential in Cerkno (Slovenia)

Casasso, Alessandro; Pestotnik, Simona; Rajver, Dušan; Jež, Jernej; Prestor, Joerg; Sethi, Rajandrea

doi:10.1016/j.egypro.2017.08.210

Cited by 21 publications

(13 citation statements)

References 16 publications

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“…Energies 2021, 14, 768 2 of 18 All these features are necessary to describe the geothermal (or heat-exchange) potential of an area, defined as the thermal power that can be exchanged with the ground through a GSHE with a certain setup [12,13]. For this purpose, the geothermal potential, which is the indicator of the efficiency and suitability for the implementation of a BHE, has been mapped in a great variety of environments and areal scales, with many different techniques, combining climatic, geological, hydrogeological and thermophysical information, usually in GIS environment-e.g., [1][2][3]9,[12][13][14][15][16][17][18].…”

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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“…The alluvial plains of Aosta (from Sarre to Quart, see Fig. 4), Verres and Pont-Saint-Martin have a lower thermal conductivity (1.90 Wm -1 K -1 ) and hence the geothermal potential is much lower (8 to 9 MWh/year), which may be considered as a medium value compared to other areas where G.POT was applied (Casasso, et al, 2017a, Casasso & Sethi, 2017. On the other hand, the plain of Aosta hosts a thick and conductive shallow unconfined aquifer (Bonomi et al, 2013) and hence it is suitable for the installation of groundwater heat pumps (which have not been analysed in this work).…”

Section: Resultsmentioning

confidence: 99%

“…This method can be applied both to only-heating or only-cooling usage profiles, thus being suitable also for hot climates in which the heating energy consumption is negligible compared to cooling needs. The method has already been applied in another pilot area of the project, the Slovenian mountain municipality of Cerkno (Casasso et al, 2017a).…”

Section: Introductionmentioning

confidence: 99%

Ground Source Heat Pumps in Aosta Valley (NW Italy): assessment of existing systems and planning tools for future installations

Casasso¹,

Valentina²,

Feo³

et al. 2018

ROL

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The economic viability of shallow geothermal systems with Borehole Heat Exchangers (BHEs) strongly depends on the thermal load which can be efficiently and sustainably exchanged with the ground. This quantity is usually defined as geothermal potential and, as reported in literature, it mostly depends on the thermal conductivity and the undisturbed temperatures of the ground. The GRETA Project funded by the EU Interreg Program Alpine Space aims to produce maps of the geothermal potential in pilot areas across the Alpine territory to identify the most suitable areas for shallow geothermal installations. This paper presents the case study of the Aosta Valley, where the recently developed G.POT (Geothermal POTential) method was adopted. It describes the data sources used and the assumptions made to derive input parameters (ground thermal properties, usage profile, etc.). In addition, the results of a survey on existing geothermal installations are presented.

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“…V projektu GRETA smo pri kartiranju v lokalnem merilu potrebovali podatke o temperaturah tal celotne občine Cerkno za določitev potenciala plitve geotermalne energije (Casasso et al, 2017(Casasso et al, , 2018. Ker se naprej opisana metodologija v Sloveniji do sedaj še ni izvajala, smo v letih 2016-2017 za boljše načrtovanje zaprtih sistemov izdelali grafe temperatur na površini trdnih tal po algoritmu iz švicarskega standarda SIA 546 384/6 (Eugster et al, 2010).…”

Section: Metodologijaunclassified

Examples of the assessment of temperatures on the surface of solid ground in the design of the shallow geothermal energy extractions

Rajver¹,

Pestotnik²,

Prestor³

2019

Geologija

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Assessment and mapping of the closed-loop shallow geothermal potential in Cerkno (Slovenia)

Cited by 21 publications

References 16 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)

Ground Source Heat Pumps in Aosta Valley (NW Italy): assessment of existing systems and planning tools for future installations

Examples of the assessment of temperatures on the surface of solid ground in the design of the shallow geothermal energy extractions

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