Laboratory Measurements of Gravel Thermal Conductivity: An Update Methodological Approach

Santa, Giorgia Dalla; Peron, Fabio; Galgaro, Antonio; Cultrera, Matteo; Bertermann, David; Mueller, Johannes; Bernardi, Adriana

doi:10.1016/j.egypro.2017.08.287

Cited by 41 publications

(22 citation statements)

References 7 publications

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“…Pressure and temperature at the dissociation interface ( Table 1 shows the proposed properties and parameters for the base model according to previous studies [4,62,80,82,[111][112][113][114].…”

Section: Resultsmentioning

confidence: 99%

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

Roostaie

Leonenko

2020

Energy Conversion and Management

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In this study, a radial 2D analytical approach has been developed to couple the wellbore heating process and the associated methane hydrate dissociation in the reservoir. A coaxial wellbore is assumed as the heat source where both conduction and convection heat transfers are considered. It consists of an inner tube and an outer structure of casing, gravel, and cement layers. In the reservoir, a similarity solution employing a moving boundary separating the dissociated and undissociated zones is employed to build the analytical solution. Two different operating schemes for water supply into wellbore heat source have been studied: i) from the inner tube; and ii) from the annulus section of the wellbore. Temperature distribution along the wellbore, temperature and pressure distributions in the reservoir, hydrate dissociation rate, and energy efficiency considering various initial and boundary conditions and reservoir properties are evaluated. The two different operating schemes have almost the same results with slightly higher gas production in the case of hot water entry into annulus, which is in direct contact with the reservoir. Increasing the inlet water temperature or decreasing the wellbore pressure increases gas production. Applying them simultaneously results in a greater gas production and energy efficiency. Some of the reservoir's properties, such as porosity, thermal diffusivity, thermal conductivity, and reservoir thickness, have direct relation with the dissociation rate, but the reservoir's permeability and gas viscosity have almost no impact on the process. The wellbore parameters, such as flow rate of hot water, inlet temperature, and wellbore radius except the inner tube radius, have direct impact on the wellbore mean temperature and the associated results in the dissociation process.

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Section: Resultsmentioning

confidence: 99%

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

Roostaie

Leonenko

2020

Energy Conversion and Management

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“…Another parameter that would be very helpful for predicting heat extraction rates and defining drilling requirements is the hydrogeological information. Groundwater presence has a positive effect on the heat extraction rate of many soils and rocks, as thermal conductivity values increase with higher water content [14,15]. Furthermore, drillers and planners have to be aware of the regional groundwater situation, as confined groundwater could lead to problems during the drilling process, which causes high costs for the client or drilling company.…”

Section: Discussionmentioning

confidence: 99%

Generalized Pan-European Geological Database for Shallow Geothermal Installations

et al. 2018

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The relatively high installation costs for different types of shallow geothermal energy systems are obstacles that have lowered the impact of geothermal solutions in the renewable energy market. In order to reduce planning costs and obtain a lithological overview of geothermal potentials and drilling conditions, a pan-European geological overview map was created using freely accessible JRC (Joint Research Centre) data and ArcGIS software. JRC data were interpreted and merged together in order to collect information about the expenditure of installing geothermal systems in specific geological set-ups, and thereby select the most economic drilling technique. Within the four-year project of the European Union’s Horizon 2020 Research and Innovation Program, which is known as “Cheap-GSHPs” (the Cheap and efficient application of reliable Ground Source Heat exchangers and Pumps), the most diffused lithologies and corresponding drilling costs were analyzed to provide a 1 km × 1 km raster with the required underground information. The final outline map should be valid throughout Europe, and should respect the INSPIRE (INfrastructure for SPatial InfoRmation in Europe) guidelines.

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“…The weather definitions explained above are used to create a climate database for integration in the tool used for sizing the Ground Source Heat Pumps (GSHPs) as well as the Decision Support System (DSS) which are developed in the Cheap-GSHPs project [33][34][35].…”

Section: Discussionmentioning

confidence: 99%

A Database for Climatic Conditions around Europe for Promoting GSHP Solutions

et al. 2018

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Abstract:Weather plays an important role for energy uses in buildings. For this reason, it is required to define the proper boundary conditions in terms of the different parameters affecting energy and comfort in buildings. They are also the basis for determining the ground temperature in different locations, as well as for determining the potential for using geothermal energy. This paper presents a database for climates in Europe that has been used in a freeware tool developed as part of the H2020 research project named "Cheap-GSHPs". The standard Köppen-Geiger climate classification has been matched with the weather data provided by the ENERGYPLUS and METEONORM software database. The Test Reference Years of more than 300 locations have been considered. These locations have been labelled according to the degree-days for heating and cooling, as well as by the Köppen-Geiger scale. A comprehensive data set of weather conditions in Europe has been created and used as input for a GSHP sizing software, helping the user in selecting the weather conditions closest to the location of interest. The proposed method is based on lapse rates and has been tested at two locations in Switzerland and Ireland. It has been demonstrated as quite valid for the project purposes, considering the spatial distribution and density of available data and the lower computing load, in particular for locations where altitude is the main factor controlling on the temperature variations.

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Laboratory Measurements of Gravel Thermal Conductivity: An Update Methodological Approach

Cited by 41 publications

References 7 publications

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

Analytical investigation of gas production from methane hydrates and the associated heat and mass transfer upon thermal stimulation employing a coaxial wellbore

Generalized Pan-European Geological Database for Shallow Geothermal Installations

A Database for Climatic Conditions around Europe for Promoting GSHP Solutions

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