geothermal energy Articles

  • Geothermal Energy Technologies

    Technology Overview   Nowhere is the raw power of geothermal resources more evident than at the Old Faithful geyser at Yellowstone National Park. (Joel Renner)  Geothermal energy is natural heat from the Earth's interior where temperatures reach greater than 7000°F. The heat is brought to the surface as steam or hot water—created when water flows through heated, permeable ...


  • Geothermal Energy... Power from the Depths

    The Earth's crust is a bountiful source of energy—and fossil fuels are only part of the story. Heat or thermal energy is by far the more abundant resource. To put it in perspective, the thermal energy in the uppermost six miles of the Earth's crust amounts to 50,000 times the energy of all oil and gas resources in the world! The word 'geothermal' literally means 'Earth' plus 'heat.' ...

  • What’s geothermal again?

    Some green energy sources seem to have charisma; others struggle for public attention with little success. Solar energy is an “it” technology, as evidenced once again by the tremendous participation in the annual Solar Power International conference in Anaheim, California this week (Oct. 27-29). Twice as many companies (945) are displaying their wares in the Expo Hall this year, despite the still ...


    By Energy Efficiency Markets

  • Lessons from Indonesia: Mobilizing Investment in Geothermal Energy

    Developing countries will need about $531 billion of additional investments in clean energy technologies every year in order to limit global temperature rise to 2°C above pre-industrial levels, thus preventing climate change’s worst impacts. To attract investments on the scale required, developing country governments, with ...

  • Rational use and management of geothermal energy resources

    This article identifies and explains several attributes of geothermal energy. High exergetic efficiency due to a close temperature tie between geothermal energy and district heating and cooling was noted. Parameters governing the rational use and management of geothermal energy systems with special emphasis on integrated-cascaded district energy systems were formulated and explained with two case ...


    By Inderscience Publishers

  • Utilisation of deep geothermal energy for heating purposes

    The Hot-Dry-Rock-(HDR) technology allows a location-independent utilisation of geothermal heat, because aquifers in deep formations, i.e. layers filled with water, are not necessary. The flow paths for the circulating water in a depth of 4 km are created by hydraulic fracturing of existing gaps. Due to the fact that this new technology is quite cost-intensive, high annual load duration of the ...


    By Inderscience Publishers

  • Design of method and mechanism for geothermal energy extraction

    By drilling using a specially designed hydride carbide (melting point: 1,365°C) drill, we can drill the earth's crust to about 5 to 40 km to reach temperatures of 700 to 1,000°C, with minimum cost of the drill and drilling technology. Further, we can extract energy by pouring in water on an inserted carbide alloy vessel into the drilled well and bringing out as steam to drive the turbines. By ...


    By Inderscience Publishers

  • Identification of high-prospect geothermal energy projects in China

    This project will focus on the identification of highly prospective geothermal energy projects in China with cooperation of Australia. The emphasis will be on geothermal prospects in the non-volcanic regions that comprise the bulk of China. The primary goal of the proposed co-operative project is to produce a portfolio of high prospect geothermal projects that are ranked in terms of ...

  • Impacts of Shallow Geothermal Energy on Groundwater Quality

    The use of shallow geothermal energy (SGE) systems to acclimatize buildings has increased exponentially in the Netherlands and worldwide. In certain areas, SGE systems are constructed in aquifers also used for drinking water supply raising the question of potential groundwater quality impact. Impacts of Shallow Geothermal Energy on Groundwater Quality provides a hydrochemical and geomicrobial ...


    By IWA Publishing

  • Hybrid Geothermal/Solar Energy Technology For Power Generation

    The novel proposed schemes of hybrid Solar Chimney Power Plant (SCPP) offer a number of potential advantages and represents an innovative way to reduce cost and minimizing the environmental impact. They are based on thermal conversion, which allows hybrid operation with both solar radiation and low temperature geothermal to continue generating electricity even when sunlight is not available. This ...


  • Exergoeconomic evaluation of a geothermal power plant

    In this study, exergy and exergoeconomic analyses of the Dora II geothermal power plant (DGPP) with 9.5 MW net power output are carried out by using real thermodynamic and cost data. The exergetic efficiency of this plant is calculated to be 29.6%. The highest exergy destruction rate among the DGPP components occurs in the cooling towers followed by the turbines, vaporisers, preheaters and pumps. ...


    By Inderscience Publishers

  • Personal Account: Stanford Geothermal Workshop

    AltaRock Energy’s Matt Uddenberg accompanied a group of staff to this year’s Stanford Geothermal Conference, where AltaRock’s Susan Petty and Trenton Cladouhos gave a presentation on the Newberry EGS Demonstration. This was Matt’s first experience with the workshop, so we asked him to ...


    By AltaRock Energy, Inc.

  • H2S Emissions Control at Geothermal Plants

    The LO-CAT® II process is used to control H2S emissions and reduce odors at geothermal power plants. Geothermal steam, considered to be a clean and environmentally friendly source of energy, is produced when water seeps into high temperature, high pressure formations below the earth's surface. The steam is brought to the surface through production wells and then expanded through a turbine to ...


    By Merichem Company

  • Artificial geothermal energy potential of steam-flooded heavy oil reservoirs

    This paper explores the concept of harnessing geothermal energy from heavy oil fields that have undergone steam flooding and so accumulated substantial heat from steam injection. Once the steam flooding process reaches economic cut-off resulting from high water cut and/or high steam-to-oil ratio, the reservoir would be abandoned, leaving behind stored energy in the form of heat. From this point, ...


    By Inderscience Publishers

  • Kenya’s first carbon credits from geothermal energy pay for schools

    Last month, I drove through dust on bumpy dirt roads from Nairobi to visit the Oloirowua Primary School in Suswa, 140 kilometers northeast of the Kenya capital. The school sits on the vast savannah near Hell’s Gate National Park, an area with substantial geothermal potential. Here, KenGen, Kenya’s electric generating company, has built the ...


    By The World Bank

  • Geothermal Heat Pump (GHP) - Case Studies

    Case Study: “GHP schools used approximately 26% less source energy per square foot of floor area,” according to an evaluation of Lincoln, Nebraska schools by the Department of Energy. The report concludes that the schools using GHP technology “outperform others in the school district.” Case Study: Annual electrical consumption in Fort Polk ...

  • World geothermal power generation nearing eruption

    With fossil fuel prices escalating and countries searching for ways to reduce oil dependence and greenhouse gas emissions, capturing the earth’s heat for power generation is garnering new attention. First begun in Larderello, Italy, in 1904, electricity generation using geothermal energy is now taking place in 24 countries, 5 of which use it to produce 15 percent or more of their total ...


    By Earth Policy Institute

  • World geothermal power generation nearing eruption

    With fossil fuel prices escalating and countries searching for ways to reduce oil dependence and greenhouse gas emissions, capturing the earth’s heat for power generation is garnering new attention. First begun in Larderello, Italy, in 1904, electricity generation using geothermal energy is now taking place in 24 countries, 5 of which use it to produce 15 percent or more of their total ...


    By Earth Policy Institute

  • Regional geological recognition for the implementation of a urban geothermal concept

    A reflection seismic survey was performed in the city of Lausanne (CH) to map geological layers relevant to geothermal energy production. By using a wireless seismic system and a powerful seismic vibrator source we were able to high quality results despite the presence of elevated urban noise levels. The new subsurface maps allow the estimation of the geothermal potential for the city of ...


    By Geo2X

  • Exergy analysis of geothermal electricity using the Kalina cycle

    The geothermal energy that is stored in the earth is so vast that could supply all the energy needed by humanity. The difficulty in tapping this energy lies in its diffusivity. The geothermal energy in regions near volcanoes is close to the surface and easy to use economically. In this paper a vapour dominated system will be examined. The electricity that is produced from such a system is ...


    By Inderscience Publishers

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