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Geothermal energy case study: Tuscany and Hungary
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Geothermal energy case study: Tuscany and Hungary






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Geothermal energy case study: Tuscany and Hungary Geothermal energy case study: Tuscany and Hungary Presentation Transcript

  • Geothermalenergy
    Short Presentation on Geothermal Energy Potential in the twoEuropeanregions: Tuscany and Hungary
    Luca Madiai
    Università degli Studi di Firenze
    Dipartimento di Filologia Moderna – Area Ugro-finnica
  • Geothermalenergy
  • Introduction
    No air pollution
    No CO2emissions
    Extractionisrelatively cheap
  • Geothermalenergybasis
    The 99% of the volume of earth is warmer than 1000 °C, and only 0.1% is lower than 100 °C
    Geothermal gradient: towards the interior of the earth the temperature rises
    Earth gradient has an average of 3°C/100 m (in Hungary it reaches 6°C/100 m)
  • History
    First use of the thermal waters were mainly for medical, household and recreational purposes. In ancient time the geothermal water could be directly used with a pipe systems. The Roman hot springs were used for eyes and skin treatment, while in Pompei were used also to heat buildings.
    Thermalbath in Pompei
    Roman thermalbath (Naples)
  • history
    In 19th century, the development of technology has allowed the discovery and exploration of groundwater resources. Tuscany geothermal energy was used initially for the production of boron and ammonium compounds. The heat production was of secondary importance. The electricity production began in 1904 thanks to the work of Prince PieroGinori Conti and in 1913 the first plant in Larderello had 250 kW installed. Today the complex of Larderello has a power of more than 600 MW and development programs expected to increase the power to 880 MW
    In France from 1960 more than 200.000 apartments are heated by geothermal water
  • History
    VilmosZsigmondy (miningengineer) wanted tofindthermal water in Városliget (Pest)
    His work wasvery risky, expensive and full of difficulties.
    At the time no one believed it was possible tofindthermal water in Pest.
    In 1878 Zsigmondycompleted the well (970 m – the deepest in the world)
    Thatwell can produce 1200 m3of 73.8 °C thermal water everyday
    Thankstohis work Széchenyi bathwasbuilt in 1913
    VilmosZsigmondy (1821-1888) –Mining engineer
  • Geotermikus Energia Magyarországon
    In Hungary the average geothermal gradient ranges between 5-7 °C/100 m, while the world's average value is 1.5-2 °C/100 m
    At depth of 1000 meters the temperature can reach or even exceed 60 °C.
    Currently, geothermal power is 0.28 percent of total energy in our country.
    In Hungary there is no electricity production from geothermal resources, while the largest producers - the U.S. and the Philippines - produce in a year from 2 to 2000 MW
  • Geothermalenergy in tuscany
    Two main areas of geothermal exploitation:
    Larderello (632 MW – dry steam) pressure (4-7 MPa) and temperature (300-350°C)
    Monte Amiata (79 MW –water dominated)
  • Geothermalenergyusage
    Today, geothermal energy is used in several areas:
    In agriculture: heating of greenhouses
    Direct district heating
    Thermal baths
    Heating and cooling with geothermal heat pump
    Power generation
    In my work I dealtwith 3 differentprojects:
    Dry steampowerplant
  • Geothermalheatpumpsystems
    Geothermalheatpump (GHP) consists in a inverse cyclethatuses the groundas low temperature source (insteadofexternal air)
    The groundhasanaverage temperature around 10°C, and itdoesnotvarysignificantlywith the seasons
    With GHP systemsispossibletoheat(max 50 °C) and coolbuildingsonlyusingelectricity
    There are two kind of GSHP: open loop and closed loop (in this case antifreeze must be used)
  • Electricity production with dry steam
    Dry steamisextractedfrom a production well
    Dry steamdirectlyexpands in turbine and a generatorproduceselectricalenergy
    The turbine outlet steamhastobecooled in a water condenser or in a coolingtower
    The cooledsteam can bere-injected in the subsoil
  • Electricity production with hot water
    The geothermal water heats up a secondaryfluid in the heatexchager
    Geothermal water temperature can be in the range 80-150 °C
    The secondaryfluidexpands in turbine and follow a normalrankinecycle (ORC)
    The secondaryfluidhas a lowerboling temperature than water
    Secondaryfluid can beeitherrefrigerant or hydrocarbon
  • Project 1 : Geothermalheatpump
    A simulation model has been created in order to study the behavior of the system in the long term
    The model includes a building, a storage tank, a heat pump, and a borehole heat exchanger
    The model can simulate weather conditions and can be used to compare different configurations and external parameters
    The software used was TRNSYS
  • Project 2: Dry steampowerplant
    A dry steampowerplantforLarderellohasbeenstudied
    A complete energy and exergy analysisof the system hasbeenperformedusing EES software
    The system works in steady state and severalsemplificationsweremade
    Constantexternalconditionshasbeenassumed (averageambient temperature and humidity)
  • Project 3: binarycyclepowerplant
    A smallbinarycycleplantforHungaryhasbeenstudiedusing EES software
    The resoultshasbeencomparedtopreviousstudies
    Severalconfigurations are possible and fewofthemhavebeenconsidered
  • Thanksforyourattention !
    Furthermore information can be found in my thesis
    Luca Madiai