Search results for " Geothermal"

showing 10 items of 20 documents

Long-term performance and life cycle assessment of energy piles in three different climatic conditions

2020

Abstract The main purpose behind the use of energy piles is to enable the exploitation of geothermal energy for meeting the heating/cooling demands of buildings in an efficient and environment-friendly manner. However, the long-term performance of energy piles in different climatic conditions, along with their actual environmental impacts, has not been fully assessed. In this paper, the results of a finite element model taking into consideration the heating and cooling demands of a reference building, and the intermittent operation of a ground source heat pump, are revealed to examine the long-term performance of energy piles. Furthermore, a life cycle assessment model is implemented to com…

020209 energy02 engineering and technology7. Clean energyCivil engineeringlaw.inventionspace heating–coolinglife cycle assessmentlawheat transfer0202 electrical engineering electronic engineering information engineeringWater cooling0601 history and archaeologyGeothermal gradientLife-cycle assessmentEnergy pile Geothermal energy Heat transfer Life cycle assessment Space heating–coolingSettore ICAR/07 - Geotecnica060102 archaeologyRenewable Energy Sustainability and the Environmentbusiness.industryGeothermal energy06 humanities and the arts13. Climate actiongeothermal energyHeat transferEnvironmental scienceenergy pilePilebusinessEnergy (signal processing)Heat pumpRenewable Energy
researchProduct

Thermomineral waters of Greece: geochemical characterization

2020

75 °C). In terms of pH most results vary from 5.5 to 823 °C) ii) warm (23 40 °C) iii) thermal (40 75 °C) and iv) hyperthermal (&gtfew springs show either very low pH (&lt10) proposing serpentinization processes. Regarding TDS concentrations collected waters can be subdivided into low salinity (up to 1.5 g/L) brackish (up to 20 g/L) and saline (up to 43 g/L). The medium high salinities can be justified by mixing with sea water and/or strong waterrock interaction processes. Isotope composition of O and H ranges from 12.7 to +2.7 ‰ SMOW and from 91 to +12 ‰ SMOW respectively and is generally comprised between the Global Meteoric Water Line and the East Mediterranean Meteoric Water Line. Only few water samples show a positive shift for δ18O possibly related to high temperature waterrock interaction processes. Carbon dioxide (18 997000 μmol/mol) or N2 (1100 989000 μmol/mol) or CH4 (&ltMany geothermal areas of Greece are located in regions affected by Miocene or Quaternary volcanism and in continental basins characterised by elevated heat flow. Moreover the majority of them is found along the coast as well as in islands of the Aegean Sea and thus thermal water is often brackish to saline due to marine intrusion into costal aquifer. In the present study almost 300 thermal and cold mineral water samples were collected along the Hellenic territory with their physicochemical parameters (temperature pH electrical conductivity and Eh) and the amount of bicarbonates (titration with 0.1N HCl) being determined in situ. Additionally gases found either in free or dissolved phase were sampled. Both water and gas samples were analysed at the INGVPa laboratories for major ions (Ion Chromatography) silica (Inductively Coupled Plasma Optical Emission Spectrometry) chemical composition of free and dissolved gases (Gas Chromatography) water isotopes (O and H) and carbon and helium isotopes of free and dissolved gases (Mass Spectrometry). The temperature of the investigated waters ranges from 6.5 to 98°C pH from 1.96 to 11.98 whilst Total Dissolved Solids (TDS) from 0.06 to 43 g/L. Based on the temperature parameter waters can be divided into four groups: i) cold (&lt0.5 913000 μmol/mol) are the prevailing gas species found in the studied sites. The δ13CCO2 values ranged from 20.1 to +8.5 ‰ whilst the isotope ratio of He from 0.21 to 6.71 R/RA.4) suggesting interaction with H2Srich gases or very high pH values (&gtSettore GEO/08 - Geochimica E Vulcanologia
researchProduct

Fluid geochemistry in a low-enthalpy geothermal field along a sector of southern Apennines chain (Italy)

2020

Abstract The chemical and isotopic features of the fluids (water and gases) in the Lucane thermal area (southern Italy) have been investigated in order to verify their origin, water temperature in the geothermal reservoir, and to recognize the main natural processes concerning the water composition during ascent towards the surface. The Lucane geothermal system is placed in the southern sector of the Apennines chains, a seismically active area, close to the southern base of the Mt. Alpi carbonate massif. Along the study area, two main sets of high-angle faults form an almost orthogonal fault system that, as suggested by local structural geology, acts as a preferential pathway for uprising d…

Calcitegeographygeography.geographical_feature_categoryδ18ODolomiteGeochemistryDeep-sourced volatiles Geochemical model Geothermometry and heat discharge Low enthalpy geothermal system Water-rock interaction Mt. Alpi massifMassif010501 environmental sciences010502 geochemistry & geophysics01 natural sciencesSettore GEO/08 - Geochimica E Vulcanologiachemistry.chemical_compoundIsotopic signaturechemistryGeochemistry and PetrologyCarbonateCarbonate rockEconomic GeologyGeothermal gradientGeology0105 earth and related environmental sciences
researchProduct

A novel hybrid polygeneration system supplying energy and desalinated water by renewable sources in Pantelleria Island

2017

Abstract In this paper a thermoeconomic analysis of a novel hybrid Renewable Polygeneration System connected to a district heating and cooling network is presented. The plant is powered simultaneously by solar and geothermal sources, producing electricity, desalinated water, heat and cooling energy. System layout includes Parabolic Through Collector (PTC) field, geothermal wells, Organic Rankine Cycle (ORC) unit and a Multi-Effect Desalination (MED) system. Cooling and thermal demands are calculated by suitable building dynamic simulation models, calibrated for Pantelleria Island. Electrical demand is obtained by measured data. A detailed control strategy has been implemented in order to pr…

EngineeringGeothermal020209 energy02 engineering and technologySolarGeothermal desalinationOrganic Rankine cycleDesalinationIndustrial and Manufacturing Engineering020401 chemical engineeringOperating temperatureDistrict heating and coolingSettore ING-IND/10 - Fisica Tecnica Industriale0202 electrical engineering electronic engineering information engineeringMulti-effect desalination0204 chemical engineeringElectrical and Electronic EngineeringGeothermal gradientCivil and Structural EngineeringOrganic Rankine cyclebusiness.industryMechanical EngineeringEnvironmental engineeringBuilding and ConstructionPollutionRenewable energyDistrict heating and cooling Geothermal Multi-effect desalination Organic Rankine cycle Parabolic through collector SolarDynamic simulationGeneral EnergyElectricityParabolic through collectorbusinessEnergy
researchProduct

A novel solar-geothermal trigeneration system integrating water desalination: Design, dynamic simulation and economic assessment

2016

Abstract In this paper, an innovative solar-geothermal polygeneration system is investigated. The system supplies a small community with electricity, desalinated water and space heating and cooling through a district network. The hybrid multi-purpose plant, based on an Organic Rankine Cycle (ORC) supplied by medium-enthalpy geothermal energy and by solar energy; this latter is provided by Parabolic Trough Collectors (PTC). The geothermal brine is first used to drive the ORC loop, then to provide space heating at around 85÷90 °C (in the winter), or cooling (in the summer, by means of a single-effect absorption chiller). Finally, the geothermal brine drives a Multi-Effect Distillation (MED) s…

EngineeringPayback period020209 energySolar energy Geothermy Polygeneration Desalination02 engineering and technologyTRNSYSDesalinationIndustrial and Manufacturing Engineering020401 chemical engineering0202 electrical engineering electronic engineering information engineeringParabolic troughSettore ING-IND/10 - Fisica Tecnica Industriale0204 chemical engineeringElectrical and Electronic EngineeringSolar energy Geothermal energy Polygeneration Desalination ThermoeconomicProcess engineeringGeothermal gradientCivil and Structural EngineeringOrganic Rankine cycleWaste managementbusiness.industryMechanical EngineeringGeothermal energyBuilding and ConstructionSolar energyPollutionGeneral Energybusiness
researchProduct

Gaseous Elemental Mercury (GEM) from mining areas and volcanic and geothermal systems in some Mediterranean areas: a preliminary study

2013

Gaseous Elemental Mercury volcanic and geothermal systems
researchProduct

Gaseous emissions from geothermal and volcanic areas: focus on methane and methanotrophs

2014

Ogni anno, 22 Tg di CH4 vengono rilasciati in atmosfera da numerose sorgenti sia naturali che antropiche. Il metano riveste un ruolo molto importante nella chimica dell’atmosfera terrestre e nel bilancio dell’energia radiante assorbita, essendo il secondo gas serra più potente dopo la CO2. Le aree vulcaniche e geotermali contribuiscono al flusso di metano in atmosfera, essendo vaste aree di degassamento. Studi preliminari hanno stimato che le emissioni globali di metano dai sistemi geotermali e vulcanici europei sono nel range di 4-16 kt a-1. Questa stima è stata ottenuta indirettamente dai dati delle emissioni di CO2 o H2O e dal rapporto del flusso CO2/CH4 oppure H2O/CH4 misurati nelle pri…

Geothermal areamethanotrophsvolcanic areaMethane; Geothermal areas; volcanic areas; methanotrophsMethaneSettore GEO/08 - Geochimica E Vulcanologia
researchProduct

The Domuyo volcanic system: An enormous geothermal resource in Argentine Patagonia

2014

Fil: Chiodini, Giovanni. Istituto Nazionale Di Geofisica E Vulcanologia. Italia. Fil: Liccioli, Caterina. Universidad Nacional de Rio Negro. Instituto de Investigaciones en Paleobiologia y Geologia; Argentina. Río Negro, Argentina Fil: Vaselli, Orlando. Universita Degli Studi Di Firenze; Italia Fil: Calabrese, Sergio. Università di Palermo; Italia Fil: Tassi, Franco. Universita Degli Studi Di Firenze; Italia Fil: Caliro, Stefano. Istituto Nazionale Di Geofisica E Vulcanologia; Italia Fil: Caselli, Alberto Tomás Universidad Nacional de Rio Negro. Instituto de Investigaciones en Paleobiologia y Geologia; Argentina. Río Negro, Argentina Fil: Agusto, Mariano R. Universidad de Buenos Aires. Facu…

Geothermal potentialGeochemistryHydrothermal circulationArgentine PatagoniaWater geochemistryCiencias de la Tierra y relacionadas con el Medio AmbienteVulcanologíaGeochemistry and PetrologyBoilingGeothermal gradientHydrologygeographyDomuyo volcanogeography.geographical_feature_categorywater geochemistrygeothermal potentialAdvectionbusiness.industrySettore GEO/08 - Geochimica E VulcanologiaDomuyo volcano Argentine Patagonia Geothermal potential Water geochemistryGeophysicsVolcanoHeat fluxbusinessCIENCIAS NATURALES Y EXACTASThermal energyGeologyThermal fluidsJournal of Volcanology and Geothermal Research
researchProduct

A tool for evaluating geothermal power exploitability and its application to Ischia, Southern Italy

2015

Abstract The paper proposes a method to evaluate the potential for electric power production at any site of possible geothermal interest. Accounting for geological data of the reservoirs, the method allows the computation of the available electrical power of the investigated site. Electrical energy production from geothermal sources is realized through different techniques, such as single flash and double flash, dry steam, and binary ORC plants. The technique chosen to be the most productive is determined by analyzing a specific range of geofluid properties, mainly temperature and pressure. Moreover, each plant typology has a global efficiency that may be correlated to geofluid enthalpy by …

Geothermal power plants Geothermal exergy Ischia volcanic islandGeothermal powerPetroleum engineeringbusiness.industryMechanical EngineeringSuperheated steamElectric potential energyGeothermal energyEnvironmental engineeringBuilding and ConstructionManagement Monitoring Policy and LawPower (physics)Settore GEO/08 - Geochimica E VulcanologiaGeneral EnergyRange (statistics)Environmental scienceElectric powerbusinessGeothermal gradient
researchProduct

A geochemical traverse along the “Sperchios Basin e Evoikos Gulf” graben (Central Greece): Origin and evolution of the emitted fluids

2014

The studied area is a 130 km long fast spreading graben in Central Greece. Its complex geodynamical setting includes both the presence of a subduction slab at depth responsible for the recent (Quaternary) volcanic activity in the area and the western termination of a tectonic lineament of regional importance (the North-Anatolian fault). A high geothermal gradient is made evident by the presence of many thermal springs with temperatures from 19 to 82 C, that discharge along the normal faults bordering the graben. In the period 2004e2012, 58 gas and 69 water samples were collected and their chemical and isotopic analysis revealed a wide range of compositions. Two main groups of thermal waters…

Greece Rift zone Geothermal activity Helium isotopes Carbon isotopesSettore GEO/08 - Geochimica E Vulcanologia
researchProduct