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Showing papers in "Geothermics in 2018"


Journal ArticleDOI
TL;DR: In this article, a fully coupled thermal-hydraulic-mechanical (THM) finite element model is presented for fractured geothermal reservoirs, where fractures are modelled as surface discontinuities within a three-dimensional matrix.

139 citations


Journal ArticleDOI
TL;DR: In this article, a mathematical model and an ideal 3D-EGS numerical model incorporating thermal-hydraulic-mechanical (THM) coupling process are established to simulate the heat production process in EGS, and the distribution regularities of pressure, temperature, stress and deformation in geothermal reservoir are analyzed.

136 citations


Journal ArticleDOI
TL;DR: In this paper, the authors present a compilation of related information to examine a more general validity of this hypothesis for the central Upper Rhine Graben (URG) for 15 geothermal wells.

101 citations


Journal ArticleDOI
TL;DR: In this paper, the meso-mechanics of granite specimens containing pre-existing holes with different ligament angles (the angle between the line connecting the centers of two holes and the horizontal direction, and set as β = 0, 45 and 90°) after different temperature treatments (T = 25, 150, 300, 450, 600, 750 and 900 ǫ).

89 citations


Journal ArticleDOI
TL;DR: In this article, a modified organic Rankine cycle (ORC) with a regeneration is used to generate power along with hydrogen, and a comprehensive thermodynamic modelling (energy and exergy analysis) and exergoeconomic analysis are carried out for the proposed cycle, using various working fluids (i.e., R245fa, R114, R600 and R236fa) in order to compare their influences on performance of the integrated system.

80 citations


Journal ArticleDOI
TL;DR: In this paper, the authors optimize the evaporation temperatures to maximize the net power outputs for evaporator pinch point temperature difference (PPTD) and brine inlet temperatures of 100-150°C.

80 citations


Journal ArticleDOI
TL;DR: In this article, a numerical study on the use of nanofluids to replace conventional ethylene glycol/water mixture as heat carrier in a BoreHole Heat Exchanger is presented.

77 citations


Journal ArticleDOI
TL;DR: In this paper, a finite line-source model is proposed for vertical ground heat exchangers (GHEs) that takes into account not only thermal conduction but also advection and dispersion mechanisms, induced by ground water flow, in a multilayer porous medium.

69 citations


Journal ArticleDOI
TL;DR: In this article, the authors conducted hydraulic fracturing experiment under triaxial stress at 20, 100, 200, 300, and 400°C and analyzed the characteristic of water pressure loading curves in the experiment, and found that crack initiation pressure decreased remarkably after 300°C.

69 citations


Journal ArticleDOI
TL;DR: In this paper, a single and double flash systems were designed to utilize the Sabalan geothermal fluid as a heat source and an Exergoeconomic model was applied on plant equipment in order to calculate the thermodynamic and economic performances of the cycles.

62 citations


Journal ArticleDOI
TL;DR: In this paper, an analytical expression was derived to describe the thermal recovery efficiency as a function of the ratio of the thermal radius of the stored volume over ambient groundwater flow velocity (Rth/u).

Journal ArticleDOI
TL;DR: In this article, the authors obtained continuous steady-state temperature logs from three deep boreholes (GR2 and DR3 in the Gonghe basin and ZR1 in the Guide basin) and measured the thermal conductivities and radiogenic heat production rates of the outcrop samples gathered from the two basins.

Journal ArticleDOI
TL;DR: In this paper, a flash-binary geothermal power plant whose binary cycle is an organic Rankine cycle (ORC) which is using various combinations of zeotropic mixtures as working fluid is optimized with particle swarm optimization (PSO) method for maximum total output power.

Journal ArticleDOI
TL;DR: In this article, the authors used a hydromechanical fractured reservoir numerical model to validate the efficacy of the mixed-mechanism stimulation conceptual model, which was consistent with the observations recorded during the Fenton Hill field experiments in three distinct ways: a marked increase in injectivity occurred at a threshold injection pressure, the near wellbore injectivity enhancement following each stimulation treatment was reversible, and seismicity propagated in a direction that was inconsistent with the orientation of the maximum principal stress, despite injection having occurred at pressures significantly above the fracturing pressure.

Journal ArticleDOI
TL;DR: In this article, the authors provide a comprehensive description of the effect of geothermal development on the air, water and soil and investigate potential disturbance from noise, subsidence, and seismicity, as well as the visual impact on the local area.

Journal ArticleDOI
Hang Li1, Yi Yang1, Ziyang Cheng1, Yiqian Sang1, Yiping Dai1 
TL;DR: In this paper, the optimal power cycle parameters can be determined by the non-dominated sorting genetic algorithm-II (NSGA-II) in the design stage with the aim of obtaining better thermodynamic and economic performance.


Journal ArticleDOI
TL;DR: In this article, the greenhouse gas (GHG) emissions of the Rittershoffen geothermal plant in France, an operating EGS (Enhanced Geothermal System) project developed in the Upper Rhine Valley are analyzed and quantified.

Journal ArticleDOI
TL;DR: In this paper, the hourly required heat load of a 200m2 office in Istanbul during the heating season is calculated by using HAP software, and the transient soil temperature profile is obtained numerically for longer periods of time with realistic boundary conditions using meteorological data.

Journal ArticleDOI
TL;DR: In this paper, the 3D resistivity model from the surface to the depth of ∼50 km through a 3D MT inversion of magnetotelluric (MT) data at the 272 sites with relatively higher quality.

Journal ArticleDOI
TL;DR: In this paper, the geothermal system in Eastern Himalayan syntax is found to exhibit the strongest surface manifestations in the western Sichuan plateau, with numerous boiling springs, fumeroles and geysers.

Journal ArticleDOI
TL;DR: In this article, the effects of coupled Thermal-Hydrological-Mechanical-Chemical (THMC) processes on fracture aperture and permeability were examined by conducting a series of flow-through experiments on artificially-fractured granite specimens at effective stresses of 5MPa to 36MPa, rock temperatures of 25°C and 130°C, and injected fluid temperature of 25 ÂC, 75 Âc, and 130 Â C.

Journal ArticleDOI
TL;DR: In this paper, the role of fractures on the permeability of a 400m-thick unit of Permo-Triassic sandstone from the EPS-1 exploration borehole in the Upper Rhine Graben near Soultz-sous-Forets (France) was investigated experimentally.

Journal ArticleDOI
TL;DR: The Los Humeros volcanic complex, a 21 × 15 km edifice nesting volcanic domes and a complex faulting structure, is located at the eastern edge of the Trans-mexican volcanic belt (TMVB) as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this article, the rate of penetration (ROP) of a 4.2km-deep well at a pilot EGS project in South Korea was smoothed using a fast Fourier transform filter.

Journal ArticleDOI
TL;DR: In this paper, an unsteady-state heat transfer model considering heat conduction and heat convection of reservoir is presented, and the finite difference method is employed to solve the mathematical model.

Journal ArticleDOI
TL;DR: In this article, the authors used Synthetic Aperture Radar (SAR) data to characterize a regional fracture system, where the backscattering intensities of SAR images can enhance small topographical reliefs relevant to fractures by using oblique microwave irradiation.

Journal ArticleDOI
TL;DR: In this paper, a set of experiments were conducted to investigate the characteristics of thermal cracks in hot dry rock (HDR) reservoirs, where granite specimens with temperatures ranging from 200 to 300 degrees were impacted by a low-pressure liquid nitrogen jet.

Journal ArticleDOI
TL;DR: In this article, a conical coil tube geothermal heat exchanger is simulated according to the environmental conditions of Tehran, the capital city of Iran, and the potential of using such system is examined by changing the geometric parameters and operational requirements.

Journal ArticleDOI
TL;DR: In this paper, an operator-based linearization approach for non-isothermal flow and transport was proposed for lowenthalpy and high-enthalpy geothermal doublet models with hydrocarbon co-production.