Examinando por Materia "ENERGIA GEOTERMICA"
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- Tesis de maestríaFeasibility study for a medium-enthalpy geothermal power plant in Rosario de la Frontera, Salta, Argentina(2018-08-24) Brender, Niklas; Conde Serra, Alejandro; Kuhn, Dietmar"In this study the surrounding of Rosario de la Frontera was investigated for its suitability for geothermal energy production. The area is located in north-western Argentina, in the province of Salta, which is at the foothills of the Andean retro-wedge and in the northern part of the Sierra de la Candelaria anticline. In this region there are 13 hot springs with temperatures between 24.1ºC to 90.5ºC, which have been used for commercial purposes since 1880 and geological investigations were carried out early on, suggesting a large hydrothermal reservoir at a maximum depth of 3000 meters. In 2012 the presence of two aquifers at different depths was detected with the help of audiomagnetotelluric investigations and recent studies indicate these depths to 150 meters and 2400 meters respectively. Samples and calculations show temperatures between 100 C to 130 C and a permeability of 49 - 81.2mD for the deep aquifer. Based on these data, the focus was placed on the performance calculation of an Organic Rankine Cycle (ORC) power plant. Thereby, a power plant adapted to the boundary conditions in Rosario de la Frontera can deliver net outputs between 388.9kW to 893.9kW for well head temperatures ranging from 95 C to 125 C. In contrast, the achievable net outputs of two example turnkey systems are in the range of 137kW- 491kW. Further economic calculations determine the electricity generation costs at a value of 26.3 - 47.9US cents per kWh for a custom made solution and between 35.6 to 118.5UScents/kWh for the two turnkey systems. However, if the thermal water mass flow can be doubled, for example by hydraulic shearing, the levelized costs of energy for all systems and temperature ranges can be reduced by 30 - 40%. Nevertheless, these costs are still higher than those of other technologies, which illustrates the relevance of possible subsidy programs for this kind of geothermal energy."
- Tesis de maestríaFinite element simulation of a highly water-saturated gas reservoir in northwestern Argentina to forecast its geothermal potential(2018) Sosa Massaro, Emiliano; Koch, Thomas; Gabi, Martín"A wide availability of in field Oil & Gas facilities which still have a marginal productive life can be a good opportunity to produce geothermal energy. The challenge is to make good decisions about the company’s assets to include geothermal energy as a candidate in their project portfolio. The self-sustainability of this type of energy production must be ensured by accurate forecasts of the net-energy balance. A geothermal energy production cycle must ensure the best selection of production and injection wells saving energy during their productive lives of the project. A first approach to the simulation of geological faults,lithological heterogeneities of rocks and their interaction with the wells is the basis for the later detailed understanding of the geothermal water cycle. Finite element simulation (FEM) it is a fast tool to understand how the key variables such as ”injection and production flow rates”, ”well-to-well interference” and ”well-to-reservoir heterogeneities interactions” can change the energy consumption needed for geothermal energy production. The role of the key parameters can be easily adjusted to make quick comparisons between different prospects before any detailed engineering is performed. The simulation performed in this thesis has shown a geothermal harvest gain of 58%, when a combination of the more advantageous properties of the geothermal system were used, in comparison with the case represented by the less efficient properties combination.Thanks to the FEM simulation, a detailed interpretation of the peculiarities of production and temperature development shows that not always the more productive case is the most efficient one. The present work presents a method to get a preliminar model of the energy production potential in a water-flooded hydrocarbon reservoir."
- Tesis de maestríaGeothermal energy in Santiago del Estero, Argentina: a flesibility study of power generation from medium enthalpy thermal sources(2018) Farina, Zeno; Conde Serra, Alejandro; Kuhn, Dietmar"The Organic Rankine Cycle technology is a reliable way to convert heat into electricity, especially when free heat is available in form of renewable energy (biomass, geothermal, solar) or as exhaust heat from industries. In the present study the attention has been paid on the application of an ORC unit for the production of electric energy in Termas de Río Hondo, north-west Argentina, making use of an existing medium-temperature geothermal source. Earlier explorations of this area have assured a hot source of about 80-90°C at 900 m of depth, thanks to a fractured saturated sedimentary basin of more than 6000 m of depth. Commercial and economic evaluations have been carried out to analyse the ORC units that are available in the market that can work with such low temperature. Three companies have been selected as potential providers of a unit to be installed in Termas de Río Hondo. The potential energy production from these units is calculated and various economic scenarios are evaluated to function as a reference to potential strategic decisions. The units’ gross power output ranges from 30 to 300 kWe, with a required hot water flow rate between 10 and 57 l/s, and a cold water flow rate between 15 and 155 l/s. The economic analysis is based on the calculation of their payback period, sale price of produced energy and Internal Rate of Return. In general, it is found that larger units are more profitable, in the face of their higher initial cost."
- Proyecto final de GradoProyecto geotérmico Copahue: estudio de prefactibilidad(2018) Marconi, Agustina; Laguinge, María Gracia; Isikawa, Ezequiel; Machicote, Lucía; Domingo, Alejandro; Mele, Fernando"El presente trabajo tiene como objetivo analizar de forma integral las condiciones de licitación de la energía geotérmica por 30 MW a través del programa RenovAR."