Geothermal gradient ≈ Geothermal gradient
View article: Enhanced geothermal systems (EGS) using CO2 as working fluid - Anovelapproach for generating renewable energy with simultaneoussequestration of carbon
Enhanced geothermal systems (EGS) using CO2 as working fluid - Anovelapproach for generating renewable energy with simultaneoussequestration of carbon Open
Responding to the need to reduce atmospheric emissions of carbon dioxide, Donald Brown (2000) proposed a novel enhanced geothermal systems (EGS) concept that would use CO{sub 2} instead of water as heat transmission fluid, and would achiev…
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Heat pipe based systems - Advances and applications Open
Heat pipes are becoming increasingly popular as passive heat transfer technologies due to their high efficiency. This paper provides a comprehensive review of the state-of-the-art applications, materials and performance of current heat pip…
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The November 2017 <i>M</i> <sub>w</sub> 5.5 Pohang earthquake: A possible case of induced seismicity in South Korea Open
Triggering quakes in a geothermal space Enhanced geothermal systems (EGSs) provide a potentially clean and abundant energy source. However, two magnitude-5 earthquakes recently occurred in South Korea during EGS site development. Grigoli e…
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Fiber‐Optic Network Observations of Earthquake Wavefields Open
Our understanding of subsurface processes suffers from a profound observation bias: seismometers are sparse and clustered on continents. A new seismic recording approach, distributed acoustic sensing (DAS), transforms telecommunication fib…
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Geothermal energy in deep aquifers: A global assessment of the resource base for direct heat utilization Open
In this paper we present results of a global resource assessment for geothermal energy within deep aquifers for direct heat utilization. Greenhouse heating, spatial heating, and spatial cooling are considered in this assessment. We derive …
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A World Overview of the Organic Rankine Cycle Market Open
The Organic Rankine Cycle (ORC) technology is a reliable way to convert heat into electricity, either for renewable energy applications (biomass, geothermal, solar), or industrial energy efficiency. ORC systems range from micro-scale (a fe…
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Controlling fluid-induced seismicity during a 6.1-km-deep geothermal stimulation in Finland Open
Near–real-time seismic monitoring and injection control limits induced earthquakes in urban geothermal reservoir stimulation.
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Heat Flux Distribution of Antarctica Unveiled Open
Antarctica is the largest reservoir of ice on Earth. Understanding its ice sheet dynamics is crucial to unraveling past global climate change and making robust climatic and sea level predictions. Of the basic parameters that shape and cont…
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From Fluid Flow to Coupled Processes in Fractured Rock: Recent Advances and New Frontiers Open
Quantitative predictions of natural and induced phenomena in fractured rock is one of the great challenges in the Earth and Energy Sciences with far‐reaching economic and environmental impacts. Fractures occupy a very small volume of a sub…
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A State-of-the-Art Review on Geothermal Energy Extraction, Utilization, and Improvement Strategies: Conventional, Hybridized, and Enhanced Geothermal Systems Open
The rising population along with a growing reliance on modern technology has increased energy demand. Energy sources must be used with caution as the focus on developing a sustainable environment grows. Renewable energy technology is requi…
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Technology for the Recovery of Lithium from Geothermal Brines Open
Lithium is the principal component of high-energy-density batteries and is a critical material necessary for the economy and security of the United States. Brines from geothermal power production have been identified as a potential domesti…
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A three-dimensional coupled thermo-hydro-mechanical model for deformable fractured geothermal systems Open
A fully coupled thermal-hydraulic-mechanical (THM) finite element model is presented for fractured geothermal reservoirs. Fractures are modelled as surface discontinuities within a three-dimensional matrix. Non-isothermal flow through the …
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Architecture and dynamics of magma reservoirs Open
This introductory article provides a synopsis of our current understanding of the form and dynamics of magma reservoirs in the crust. This knowledge is based on a range of experimental, observational and theoretical approaches, some of whi…
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The seismo-hydromechanical behavior during deep geothermal reservoir stimulations: open questions tackled in a decameter-scale in situ stimulation experiment Open
In this contribution, we present a review of scientific research results that address seismo-hydromechanically coupled processes relevant for the development of a sustainable heat exchanger in low-permeability crystalline rock and introduc…
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Thermal drawdown-induced flow channeling in a single fracture in EGS Open
Here, the evolution of flow pattern along a single fracture and its effects on heat production is a fundamental problem in the assessments of engineered geothermal systems (EGS). The channelized flow pattern associated with ubiquitous hete…
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Overview of naturally permeable fractured reservoirs in the central and southern Upper Rhine Graben: Insights from geothermal wells Open
International audience
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Thermally induced group effects among energy piles Open
The behaviour of conventional pile groups (e.g. closely spaced) that are subjected to mechanical loads has been shown to be different from the behaviour of single isolated piles. The so-called ‘group effects’ are responsible for this behav…
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Features of CO<sub>2</sub> fracturing deduced from acoustic emission and microscopy in laboratory experiments Open
We conducted hydraulic fracturing (HF) experiments on 170 mm cubic granite specimens with a 20 mm diameter central hole to investigate how fluid viscosity affects HF process and crack properties. In experiments using supercritical carbon d…
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Renewable and Sustainable Energy Reviews: Environmental impact networks of renewable energy power plants Open
The intensification of the use of different renewable energy sources is essential for the fulfillment of the Paris Agreement or for achieving the goals of sustainable development. The environmental impacts of various renewable energy sourc…
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Thermal Cracking in Westerly Granite Monitored Using Direct Wave Velocity, Coda Wave Interferometry, and Acoustic Emissions Open
To monitor both the permanent (thermal microcracking) and the nonpermanent (thermo‐elastic) effects of temperature on Westerly Granite, we combine acoustic emission monitoring and ultrasonic velocity measurements at ambient pressure during…
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Arsenic in Latin America: New findings on source, mobilization and mobility in human environments in 20 countries based on decadal research 2010-2020 Open
Today (year 2020), the globally recognized problem of arsenic (As) contamination of water resources and other environments at toxic levels has been reported in all of the 20 Latin American countries. The present review indicates that As is…
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Role of sustainable heat sources in transition towards fourth generation district heating – A review Open
As an integrated part of future sustainable energy systems, district heating has been widely established as a convenient solution to provide energy-efficient space heating and sanitary hot water. In the pathway towards decarbonization of d…
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Geothermal energy at different depths for district heating and cooling of existing and future building stock Open
Recent developments in the building sector, district heating and cooling (DHC) field, and geothermal technology are reported here, which indicate the trends and efforts to more sustainable and climate-friendly heating and cooling supply sy…
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5th generation district heating and cooling systems as a solution for renewable urban thermal energy supply Open
In order to reduce greenhouse gas emissions and decrease dependency on depleting fossil fuel resources the shift to a renewable energy system is necessary. District heating and cooling systems are a viable solution to provide heat and cold…
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First field application of cyclic soft stimulation at the Pohang Enhanced Geothermal System site in Korea Open
Large-magnitude fluid-injection induced seismic events are a potential risk for geothermal energy developments worldwide. One potential risk mitigation measure is the application of cyclic injection schemes. After validation at small (labo…
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Low Temperature District Heating for Future Energy Systems Open
S.26-38
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Geothermal Heat Flux Reveals the Iceland Hotspot Track Underneath Greenland Open
Curie depths beneath Greenland are revealed by spectral analysis of data from the World Digital Magnetic Anomaly Map 2. A thermal model of the lithosphere then provides a corresponding geothermal heat flux map. This new map exhibits signif…
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A Geophysical Perspective on the Bulk Composition of Mars Open
We invert the Martian tidal response and mean mass and moment of inertia for chemical composition, thermal state, and interior structure. The inversion combines phase equilibrium computations with a laboratory‐based viscoelastic dissipatio…
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25 years of DECOVALEX - Scientific advances and lessons learned from an international research collaboration in coupled subsurface processes Open
This paper provides an overview of an international research collaboration for advancing the understanding and modeling of coupled thermo-hydro-mechanical-chemical (THMC) processes in geological systems. The creation of the international D…
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An updated ground thermal properties database for GSHP applications Open
When a new ground source heat exchanger field is planned, underground thermal properties input data are necessary for the correct sizing of the geo-exchange system. To support the design, the EU founded Cheap-GSHPs project developed a Deci…