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Maria S. Gudjonsdottir
Reykjavík University
Geothermal gradientGeologyWaste heatGeotechnical engineeringWaste management
6Publications
2H-index
11Citations
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Publications 8
Newest
#1Vijay Chauhan (RU: Reykjavík University)
#2Maria S. Gudjonsdottir (RU: Reykjavík University)H-Index: 2
Last. Gudrun Saevarsdottir (RU: Reykjavík University)H-Index: 6
view all 3 authors...
Abstract The work presents computational modeling and an experimental investigation of silica deposition occurring in geothermal systems with superheated steam flows. An advection diffusion model was implemented for predicting silica particle transport and deposition in turbulent flows. The model includes the effect of Brownian diffusion, turbulent diffusion, turbophoresis, Saffman lift force, and drag force on particle motion. Simulation results for deposition of silica particles in superheated...
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#1Vijay Chauhan (RU: Reykjavík University)
#2Maria S. Gudjonsdottir (RU: Reykjavík University)H-Index: 2
Last. Gudrun Saevarsdottir (RU: Reykjavík University)H-Index: 6
view all 3 authors...
The paper describes a computational study and an experimental investigation of aqueous potassium carbonate droplets in superheated steam flow for potential applications in mitigation of superheated geothermal steam. The computational model included the boiling point elevation due to the droplet salt concentration as well as other concentration-dependent physical properties of the salt solution. Various phenomena involved in the process, such as breakup, transport, heat transfer, boiling and coup...
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#1Samuel Scott (RU: Reykjavík University)H-Index: 5
#1Samuel W. Scott (RU: Reykjavík University)H-Index: 1
Last. Maria S. Gudjonsdottir (RU: Reykjavík University)H-Index: 2
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The quantitative connections between subsurface geologic structure and measured geophysical data allow 3D geologic models to be tested against measurements and geophysical anomalies to be interpreted in terms of geologic structure. Using a Bayesian framework, geophysical inversions are constrained by prior information in the form of a reference geologic model and probability density functions (pdfs) describing petrophysical properties of the different lithologic units. However, it is challenging...
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#1Vijay Chauhan (RU: Reykjavík University)
#2Maria S. Gudjonsdottir (RU: Reykjavík University)H-Index: 2
Last. Gudrun Saevarsdottir (RU: Reykjavík University)H-Index: 6
view all 3 authors...
Abstract A study on scrubbing of superheated steam containing silica impurities is performed using an aqueous potassium carbonate solution as a potential application in mitigation of superheated geothermal steam. An experimental setup aimed at testing a silica particle scrubbing technique was built. The setup consists of a superheated steam generating system, a silica particle feeding and an injection system, a salt solution injection and separation system, and a sampling unit. Silica particle c...
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#1Leo Blaer Haraldsson (RU: Reykjavík University)
#2Gudrun Saevarsdottir (RU: Reykjavík University)H-Index: 6
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The Alcoa Fjarðaal smelter in Iceland consumes 4600 GWh annually to produce aluminum. About 50% of the total energy absorbed by the cells is reduced to waste heat of which roughly 40% is currently lost through exhaust gases. The exhaust gases leave the cells at about 110 °C before entering the gas treatment center (GTC). The feasibility of operating heat exchangers upstream of GTCs has been demonstrated at other smelters. Reyðarfjordur, which is 5.5 km from Fjarðaal currently uses electricity fo...
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#1Miao Yu (RU: Reykjavík University)H-Index: 1
#2Maria S. Gudjonsdottir (RU: Reykjavík University)H-Index: 2
Last. Gudrun Saevarsdottir (RU: Reykjavík University)H-Index: 6
view all 4 authors...
Around half of the energy consumed in aluminum production is lost as waste heat. Approximately 30–45% of the total waste heat is carried away by the exhaust gas from the smelter and is the most easily accessible waste heat stream. Alcoa Fjarðaal in east Iceland produces 350 000 tons annually, emitting the 110 °C exhaust gas with 88.1 MW of heat, which contains 13.39 MW exergy. In this study, three scenarios, including organic Rankine cycle (ORC) system, heat supply system and combined heat and p...
2 CitationsSource
#1Maria S. Gudjonsdottir (RU: Reykjavík University)H-Index: 2
#2Halldór PálssonH-Index: 12
Last. Gudrun SaevarsdottirH-Index: 6
view all 4 authors...
Laboratory experiments were made where two phase mixture of flashed geothermal brine was injected into a tube filled with porous material. Direct measurements of pressure gradient and mass flow were made and used for calculating the relative permeabilities of the two phases. The results were compared with relative permeabilities calculated from field data using the Shinohara method. The resulting relative permeabilities comply with known relative permeability curves to some extent, where the int...
#1Carlos Atli Córdova Geirdal (RU: Reykjavík University)H-Index: 1
#2Maria S. Gudjonsdottir (RU: Reykjavík University)H-Index: 2
Last. Pall Jensson (RU: Reykjavík University)H-Index: 3
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Abstract The objective of this paper was to do an economic comparison between the traditional approach to geothermal projects and a well-head method, where smaller power plants were installed on each well to considerably reduce the time until energy production begins. The two methods were compared in a hypothetical steamfield, based on their NPV and net power production. The comparison showed that wellhead power plants benefit geothermal projects by increasing the power output and NPV by as much...
9 CitationsSource
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