1,720,962 research outputs found
Closed-loop heat-exchanging systems in geothermal anomaly areas: a feasibility analysis in the Euganean Thermal Basin, Italy
No full textFeasibility analysis of a Borehole Heat Exchanger (BHE) array to be installed in high geothermal flux area: The case of the Euganean Thermal Basin, Italy
No full textFeasibility analysis of a Borehole Heat Exchanger (BHE) array to be installed in high geothermal flux area: The case of the Euganean Thermal Basin, Italy
No full textThis work analyses the feasibility and sustainability of closed-loop heat-exchangers, also known as Borehole Heat Exchangers (BHEs), in shallow geothermal areas. By circulating a carrier fluid in a closed-loop of pipes installed vertically in a deep well, there is no fluid exchange between the BHEs and hot thermal groundwater, but only heat transfer. The BHEs absorb heat when in contact with the warmer subsoil, and release it to buildings. It is designed that heating is provided through a free-heating system, avoiding the need to use a Ground Source Heat Pump system or other thermal energy device. An actual application of such technique in a public building located in an important thermal area in north-east Italy is analysed in terms of its thermal impact on underground and groundwater temperature. The test area is part of the so called Euganean Thermal Basin (ETB), which is the most important thermal district in northern Italy. The ETB is located in the eastern Po river plain and is one of the most important thermal and mud-therapeutic spas in the world. More than 250 hotels offer hospitality to more than 3 million tourists every year. Almost every hotel and spa owns a well to extract thermal water at a temperature in the range 60-87°C from the fractured carbonatic bedrock found at a depth of about 50-200m below ground level. To preserve this fundamental resource, the local legislation does not allow extracted thermal water to be used for purposes other than therapeutic ones. Several spas and thermal wells are present in the surroundings of the concerned building and it must be verified that heat extraction by the BHE-array during its operation does not hinder the temperature of thermal wells. The analysis is carried out using a finite elements analysis code (FEFlow 6.1), simulating mass and heat transfer inside porous media. Various array configurations are simulated and it is found that an array of 4 BHEs 240m deep provide enough thermal energy to the building decreasing by less than 2°C the temperature of the closest well's extracted water. A feasibility analysis of a more widespread District Heating scheme in the Euganean Thermal Basin area should therefore be carried out
Master of Science in Energy and Environment - Instituto Tecnológico de Buenos Aires - Karlsruhe Institute of Technology
Full text linkFil: Farina, Zeno. Instituto Tecnológico de Buenos Aires; Argentina.Fil: Conde Serra, Alejandro. Servicio Geológico Minero Argentino. Instituto de Geología y Recursos Minerales; Argentina.Fil: Kuhn, Dietmar. Karlsruher Institut für Technologie; Alemania.Examinadores: Prof. Geol. Silvia Barredo (ITBA) ;
Dra. Ing. Cecilia Smoglie (ITBA)La tecnología de los Ciclos Orgánicos Rankine es una manera confiable de convertir el calor en electricidad, especialmente cuando hay calor disponible en forma de energía renovable (biomasa, geotérmica, solar) o en forma de escape de aplicaciones industriales. En el presente estudio, se ha prestado atención a la aplicación de una unidad ORC para la producción de energía eléctrica en Termas de Río Hondo, noroeste de Argentina, utilizando una fuente geotérmica existente de temperatura media. Las exploraciones anteriores de esta área han asegurado una fuente caliente de aproximadamente 80-90°C a 900 m de profundidad, gracias a una cuenca sedimentaria saturada y fracturada de más de 6000 m de profundidad. Se han llevado a cabo evaluaciones comerciales y económicas para analizar las unidades de ORC que están disponibles en el mercado y que pueden funcionar con temperaturas tan bajas. Tres empresas han sido seleccionadas como posibles proveedores de una unidad para instalar en Termas de Río Hondo. Se ha calculado la producción potencial de energía de estas unidades y se ha evaluado diversos escenarios económicos para que funcionen como una referencia para eventuales decisiones estratégicas. La potencia bruta de las unidades varía entre 30 y 300 kWe, con un caudal de agua caliente requerido entre 10 y 57 l/s, y un caudal de agua fría entre 15 y 155 l/s. El análisis económico se basa en el cálculo de su período de amortización, en el precio de venta de la energía producida y en la Tasa Interna de Retorno. En general, se encuentra que las unidades más grandes son más rentables, a pesar de su mayor costo inicial
Soluzioni geotermiche con pompa di calore in zone alpine - Geothermal solutions with heat pump in alpine areas
No full textRelevance of computing freeze-thaw effects for borehole heat exchanger modelling: A comparative case study
No full textFeasibility analysis of a Borehole Heat Exchanger (BHE) to be installed in high geothermal flux area: the case of Euganean Thermal Basin, Italy
No full textSolar ground energy storage coupled with heat pumps in cold climates
No full textThe use of Ground Source Heat Pump systems for heating and cooling has grown significantly during the last years. All
countries have moved to promote the use of renewable energy for the reduction of primary energy use and CO2 emissions
related to space heating/cooling and domestic hot water production. These systems are a promising technology able to use free
heat sources and to be used also for cooling purposes. In the presented study such system is used for space heating and it uses
the ground for extracting heat and injecting solar thermal energy when in excess. This work looks at the use of vertical
Borehole Heat Exchangers installed in cold climate characterized by low air temperatures. In these locations, the building load
profile is usually heating dominant with absent cooling necessity, especially in residential buildings where internal gains are
low. When Ground Source Heat Pump systems are used for heating only, their performance decrease due to unbalanced heat
transfer with the ground. Solar thermal collectors can help in this matter by allowing a better performance of these systems
installed in cold zones. All the analysis have been carried out with the dynamic simulation tool TRNSYS
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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