Showing papers in "Geothermics in 2017"

TL;DR: In this paper, the effect of high temperature treatments (200, 300, 400, 500, 600, 700 and 800) on the crack damage, strength and deformation failure behavior of a granite was investigated.

TL;DR: In this paper, the effects of operating parameters on energy and exergy efficiencies as well as total annual cost rate are studied for the proposed power plants using geothermal fluid energy as low-grade heat source and cold energy of LNG as thermal sink.

TL;DR: In this paper, the authors investigated the stress-strain behavior under in-situ stress and temperature conditions by conducting a series of high-pressure, high-temperature triaxial experiments on Australian Strathbogie granite under four different confining pressures (10, 30, 60, 90 MPa) and four different temperatures (RT, 100, 200, 300 °C).

TL;DR: In this paper, the effects of temperature on the physical properties and mechanical and permeability behavior of sandstone were analyzed, and a series of empirical relations between the temperatures and physical and mechanical properties were derived, and are expected to aid in geothermal energy extraction from super-critical temperature resources.

TL;DR: In this article, the authors performed coupled Thermo-Hydro-Mechanical (THM) simulations using a robust code called Finite Element for Heat and Mass Transfer (FEHM) for a 3D domain with a single fracture connecting the injection and production wells.

TL;DR: In this article, an extended description of the implementation of the deep geothermal wells GRT-1 andGRT-2 respectively drilled in 2012 and 2014 in the framework of the ECOGI project is given.

TL;DR: In this paper, the authors summarized the achievements at Soultz during the development of three reservoirs by more than 15 major stimulations over a 20-year period between 1988 and 2007, and evaluated the efficiency of different injection schemes used and provided details on the performance history and testing conditions.

TL;DR: In this paper, a revised lithostratigraphic characterization of Los Humeros subsurface together with petrographic, geochemical and 40 Ar/39 Ar-based geochronology data support correlation of rock formations at depth with surface geology.

TL;DR: All the current hot springs are in the extremely high class that was defined by GIS based MCDA method, which has vital advantages such as preperation data that extends over large area, exploration of current and potential geothermal fields, and achieving a more controlled and acurate results by narrowing target area.

TL;DR: In this paper, the authors used Fuzzy TOPSIS as multi-criteria decision making (MCDM) technique to rank cycles based on problem criteria of thermodynamic and economic performance.

TL;DR: In this paper, a two-stage artificial neural network (ANN) was used to optimize the geothermal energy aided absorption refrigeration system using NH3-H2O as the working fluid.

TL;DR: In this article, the geothermal doublet layout with respect to the paleo flow direction in fluvial sedimentary reservoirs could significantly affect pump energy losses in Hot Sedimentary Aquifers.

TL;DR: In this paper, the authors evaluate the impact of reduction of doublet well spacing, below the current West Netherlands Basin standard of 1000 to 1500 m, on the Net Present Value (NPV) and the life time of fluvial Hot Sedimentary Aquifer (HSA) doublets.

TL;DR: In this article, a case of hydraulic stimulation of deep geothermal systems to analyze the mechanisms that may induce or trigger co-and post-injection seismicity was studied. But the authors did not consider the effect of thermal effects due to cooling and stress redistribution due to fault slip.

TL;DR: In this article, the authors incorporate the concept of risk into the GIS-based analysis for generating geothermal prospectivity maps via Ordered Weighted Averaging (OWA) approach.

TL;DR: In this paper, the authors applied a genetic algorithm method to an integrated system composed of an alkaline water electrolysis unit for hydrogen production and a combined flash-binary geothermal power plant for providing power input to the electrolysis units.

TL;DR: In this paper, the results of numerical simulation of an abandoned oil well in the Southern part of Iran, in “Ahwaz oil field”, is used for simulation of multi-effect seawater desalination process which uses oil well as a heat source and can approximately produce 565m 3 /day of fresh water.

TL;DR: In this paper, the authors derived a dynamic heat transfer coefficient between rock walls and flowing fluid, based on an experimental setup with simple geometry and a steady state scenario, and compared their model to experimental data and achieved a good agreement for most temperatures.

TL;DR: In this paper, the authors present an extensive geochemical dataset from the geothermal plant in Kirchstockach in Southern Germany, and evaluate four processes that could promote calcite scaling: decompression of the produced fluid between the reservoir and the wellhead, corrosion of the casing that drives pH increase and subsequent calcite solubility decrease, gas influx from a geothermal reservoir and subsequent stripping of CO2 from the aqueous fluid, and boiling within the well.

TL;DR: In this paper, an analytical solution based on fully coupled linear porothermoelastic model with thermal osmosis and thermal filtration effects in Laplace space domain is proposed.

TL;DR: In this article, an initial screening tool, called Geothermal Risk of Induced seismicity Diagnosis (GRID), is proposed for estimating to what extent induced seismicity is of concern for a specific project.

TL;DR: In this paper, the authors examined the technical and environmental performance of a ground source heat pump system (GSHP) using the method of Life Cycle Assessment (LCA) and found that 73% and 14.54% of the assessment are attributed to the categories of acidification and greenhouse effect respectively.

TL;DR: In this article, a geothermal-powered absorption cooling system is considered for cooling of buildings and an economic analysis of the system is performed to assess cost structure, potential revenues, payback periods and life cycle cost analysis.

TL;DR: In this article, a 3D finite element model of circular borehole cluster connected in series is used as a response model to generate normalized transfer functions of a borehole thermal energy storage system under the influence of ground surface temperature variations and groundwater flow.

TL;DR: In this article, a thermal conductivity map of an area geographically placed in the center of Spain, the province of Avila, is proposed, based on a thermal response test.

TL;DR: In this article, the authors used composite cylindrical heat-source (CCS) models and typical thermal response test procedures to investigate two full-scale borehole heat exchangers (BHE); where one is a U-tube BHE, and the other, a pipe-in-pipe (coaxial) BHE.

TL;DR: In this paper, the statistical data of the effective thermal conductivity (λe) of sandstones, mudstones, and marlstones from Bavaria, Germany were presented.

TL;DR: The GeoLaB as mentioned in this paper, a geothermal laboratory in the crystalline basement, is proposed as an infrastructure to answer scientific challenges and to offer the necessary transparency to interact with the public.

TL;DR: In this paper, the average geothermal gradient of the Western Alpine Molasse Basin (WAMB) is estimated to be around 25-30°C/km, and the authors use this data to build the first well data-driven 3D geostatistical temperature model of the whole basin and generate probabilistic maps of isotherms at 70 and 140°C.

TL;DR: In this article, the authors presented a methodology for estimating the hydraulic conductivity of the Larderello geothermal field by integrating structural geology, fluid inclusions results and numerical analyses.