Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 69 for “"Geothermal Systems"”.
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Geothermal Systems Performance and Environmental Impacts
The use of fossil fuels for heating and cooling purposes is plagued by problems including environmental impacts, unsustainable production, and increased greenhouse gas production. This had led to a worldwide interest in developing sustainable sources of energy. One such energy is ground source heat …
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Fracturing and sealing in geothermal systems.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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Numerical Model Studies of Enhanced Geothermal Systems
Enhanced Geothermal Systems (EGS) are being developed around the world as a method of extraction of thermal energy. A good EGS reservoir should maintain a small thermal drawdown and low water loss. All factors must be considered for optimal levels of energy production and assuring a long life span …
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The Geochemistry of Silica in Icelandic Geothermal Systems
The geochemistry of silica in Icelandic geothermal fluids was studied. The data considered span over 60 years of a sample collection of both sub-boiling liquid water and two-phase well discharges, in total ~1650 samples from >30 geothermal areas. The measured concentration of silica in the samples …
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Nitrous oxide as working fluid in enhanced geothermal systems (EGS)
La energía geotérmica es una fuente de energía renovable que se puede encontrar en abundancia en nuestro planeta. Solo una pequeña fracción de esta se convierte actualmente en energía eléctrica, aunque en los últimos años la capacidad geotérmica instalada ha aumentado considerablemente en todo el …
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Feasibility study of sedimentary enhanced geothermal systems using reservoir simulation
… the preliminary feasibility of commercial geothermal projects, from a sedimentary reservoir with low permeability that requires productivity enhancement, using numerical reservoir simulation. The performance of a sedimentary geothermal reservoir is investigated in terms of reservoir …
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Thermomechanical analysis of rock asperity in fractures of enhanced geothermal systems
<p>"Enhanced Geothermal Systems (EGS) offer great potential for dramatically expanding the use of geothermal energy and become a promising supplement for fossil energy. The EGS is to extract heat by creating a subsurface system to which cold water can be added through injection wells. Injected …
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Quartz dissolution and silica deposition in Hot Dry Rock geothermal systems
Thesis: M.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1982
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Coupled thermo-hydro-mechanical behavior of glacial tills in shallow geothermal systems
… subjected to thermal gradients, such as shallow geothermal systems, motivated this study. The soil response under representative field conditions upon heating can affect the performance and overall operation of shallow applications, demanding adequate input parameters for an efficient design. …
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Hydrothermal spallation drilling and advanced energy conversion technologies for Engineered Geothermal Systems
… economic and technical feasibility of Engineered Geothermal Systems, with a special emphasis on advanced drilling technologies. The first part of the thesis was devoted to modeling and analysis of the technologies used to develop EGS projects. Since the cost of completing wells is a major factor …
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Deep hydrology of the geothermal systems in the Taupo Volcanic Zone, New Zealand
… flows of water and heat which give rise to the geothermal fields in the Taupo Volcanic Zone (TVZ), New Zealand. To carry out this study, a super-critical equation of state module has been developed for the geothermal simulator TOUGH2, which can describe the flow of water at the conditions …
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Application of the 3-D Hydro-Mechanical Model GEOFRAC in enhanced geothermal systems
… stochastic model of natural rock fracture systems. The main characteristic of GEOFRAC is that it is based on statistical input representing fracture patterns in the field in form of the fracture intensity P₃₂ (fracture area per volume) and the best estimate fracture size E[A]. Recent …
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Assessing Social Acceptance of Geothermal Systems in Western Canada: Evidence from Alberta and British Columbia
Energy systems globally face growing pressure to decarbonize while maintaining affordability, reliability, and security. In Canada, these challenges are especially evident in Western Canada, notably Alberta and British Columbia, which have contrasting energy landscapes. Although geothermal systems …
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A Comparative Case Study of Enhanced Geothermal Systems: Interacting Imaginaries of Place and Energy in Renewable Energy Transitions
… and cultural forces that shape both our energy systems and responses to efforts to change those systems. Public responses to new clean energy technologies, including negotiations of the risk and acceptability of local projects, can be critical to the success or failure of such technologies. …
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Understanding the Relationship between Hydraulic Properties of Rocks and Induced Seismicity in the Stimulation of Enhanced Geothermal Systems
… of numerical models to gain insight on Enhanced Geothermal System (EGS) stimulation operations. These operations consist of high pressure injection of cold water in low permeability formations at depth of 2-4 kilometres, promoting the opening of existing fractures and creating an artificial …
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Using MT3DMS for simulation of field-scale heat transport with groundwater advection for applications to borehole geothermal systems
Made available in DSpace on 2021-03-05T21:38:22Z (GMT). No. of bitstreams: 3 ZONG-THESIS-2020.pdf: 3973446 bytes, checksum: 93c7e44ec5fee74eee8e03ac7dc5614e (MD5) coupled iterative code.rar: 1616113 bytes, checksum: b3a99832c493aae0621043cf8bf2469d (MD5) LICENSE.txt: 4207 bytes, checksum: …
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Interplay of porous media and fracture stimulation in sedimentary enhanced geothermal systems : Red River Formation, Williston Basin, North Dakota
Fracture stimulated enhanced geothermal systems (EGS) can be installed in both crystalline rocks and sedimentary basins. The Red River Formation (Ordovician), which lies between 3.6 and 4.2 km depth in the Williston Basin, is a viable site for installation of sedimentary EGS (SEGS). SEGS is …
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Implications of geothermal energy production via geopressured gas wells in Texas : merging conceptual understanding of hydrocarbon production and geothermal systems
This thesis evaluates the overall geothermal energy development potential of the state of Texas by combining resource assessment studies from both the hydrocarbon and conventional geothermal sectors. Cooperation between these industries is often shown to result in a symbiotic relationship that will …
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Geothermal systems in the Chalk of the south east of England: methods of predicting thermal transport in a fractured aquifer
… aquifer beneath London to supply "open loop" geothermal systems (Environment Agency, 2007). However, there has been little research conducted on how the water re-injected by these systems, which often differs in temperature by as much as 10°C, will interact with the fractured Chalk aquifer in …
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High Temperature Seismic Monitoring for Enhanced Geothermal Systems - Implementing a Control Feedback Loop to a Prototype Tool by Sandia National Laboratories
Geothermal energy can make an important contribution to the U.S. energy portfolio. Production areas require seismic monitoring tools to develop and monitor production capability. This paper describes modifications made to a prototypical seismic tool to implement improvements that were identified …
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