geothermal power Articles
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Nevada Geothermal, Ormat to develop Oregon resource
Nevada Geothermal Power Inc. (Vancouver, B.C.) and Ormat Nevada Inc., a subsidiary of Ormat Technologies Inc. (Reno, NV), have signed an agreement under which the two companies will jointly develop, construct, own, and operate one or more geothermal power plants at the Crump Geyser Project Area in Lake County, Oregon. The agreement calls for the formation of a limited liability company, Crump ...
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Effect of Non-Condensable Gases on geothermal power plant performance. Case study: Kizildere Geothermal Power Plant-Turkey
Non-Condensable Gases (NCGs) are natural components of geothermal fluids, and they are a source of considerable capital and operating costs for power plants. The NCG content of geothermal steam varies over the world from almost zero to as much as 25% (wt). In this work, the influence of NCGs on the thermodynamic performance of geothermal power plants is analysed for various NCG content and ...
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This small Central American country is a renewable energy powerhouse
When you think of places that rely on geothermal power for energy production, El Salvador probably isn’t the first location that comes to mind. But this tiny Central American country is a geothermal powerhouse. According to the International Energy Agency, a whopping 22 percent of the electricity used in El Salvador comes from geothermal. The vast reserves of geothermal power buried ...
By Ensia
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Exergy analysis and pressure optimisation of geothermal binary power plants
Binary geothermal power plants are used for power production from moderate temperature geothermal reservoirs (85-170°C). In performance analysis of those plants, the second law of thermodynamics is used like in other conventional power plants. In this paper, the exergy analysis and pressure optimisation methods are described for binary power plants. The method described is applied to a ...
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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. ...
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The effect of ambient temperature fluctuation on the performance of geothermal power plants
Seasonal and diurnal temperature fluctuations have significant effects on cooling water temperature and on the condenser temperature. The power produced by plants that utilise a low temperature resources, such as geothermal units, are more susceptible to ambient temperature fluctuations than conventional power plants. An exergy analysis was performed to evaluate the effect of ambient temperature ...
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Performance optimisation of the combined single flash binary geothermal power plant
In this paper, the optimal operating conditions of a hypothetical combined single flash-binary geothermal power plant are investigated and performance analyses are performed based on Aydin-Germencik field in Turkey. The relationship between flashing pressure, turbine inlet pressure of the binary cycle and total heat transfer area of the heat exchanger are determined for maximum power output of ...
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Exergy analysis and performance evaluation of Kizildere Geothermal Power Plant, Turkey
Conventional geothermal power plants (GPP) differ from fossil-fuel power plants (FFPP) in many ways. The most specific ones are that GPPs are not cyclic plants and the working fluid is not pure steam. Geothermal steam contains non-condensable gases (NCG) which degrade power plant efficiency. This discrepancy leads to two considerations in energy and exergy analysis of GPPs. One is that the amount ...
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Heat as a by–product or sub–product of CO2 storage in mafic and ultramafic rocks
Since carbonates are at a lower energy state than free CO2, storage through carbonation of silicate rocks is thermodynamically favoured and proceeds spontaneously by releasing heat. In an in–situ CO2 injection site, the heat released in these exothermic reactions can be exploited in a geothermal power–plant, effectively contributing toward the economic viability of the storage process. Our ...
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Boron pollution due to geothermal wastewater discharge into the Buyuk Menderes river, Turkey
Kizildere, which is the only commercial geothermal power plant in Turkey and located in Buyuk Menderes Graben in south-west Turkey, discharges annually 6 million tonnes of wastewater into the Buyuk Menderes river, creating environmental pollution. Currently, the wastewater, which includes up to 24 mg/l boron, is discharged into the river at a rate of 750–1500 tonnes per hour. The temperature of ...
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Geothermal Power Approaches 12,000 Megawatts Worldwide
In 2013, world geothermal electricity-generating capacity grew 3 percent to top 11,700 megawatts across 24 countries. Although some other renewable energy technologies are seeing much faster growth—wind power has expanded 21 percent per year since 2008, for example, while solar power has grown at a blistering 53 percent annual rate—this was geothermal’s best year since the ...
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Evaluation of utilisation opportunities of geothermal energy in the Kavala region, Greece, using exergy analysis
Greece has a lot of geothermal energy fields. Due to legal inefficiencies, the exploitation of this renewable energy source remains at very low levels. In this work, the operation of a cogeneration (hot water and electricity) geothermal plant that could be built in Eratino, Greece, is analysed. The research on the development of a low enthalpy geothermal field is investigated as a very essential ...
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A necessary condition for optimum Rankine cycle power plants
Consumers pay more for electricity than necessary partly because commercial power plant operating criteria are not universally valid. Although such plants are commonly designed to provide electricity at least cost for given conditions, operating criteria lack a rigorous thermodynamic basis. The current empiricism alone costs US consumers billions of dollars per year. This dilemma exists because ...
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Renewable energy systems: the environmental impact approach
High energy consumption and the world population increase will lead to shrinking reserves of fossil fuels. Concern about carbon dioxide emissions may discourage widespread dependence on fossil fuels and encourage the development and use of renewable energy systems employing a variety of technologies Renewable energy systems have themselves an environmental impact. Land use and material employed ...
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Case Study - 6MW Non-Condensing Power Plant
Lihir Island, Papua New Guinea – 2003 First Geothermal Power Station in PNG: Press Release, April 16, 2003 Lihir Gold Limited “Gold company Lihir Gold Limited is turning its vast geothermal resource into an opportunity. In April, the company started commissioning a 6MW geothermal power station, the first in Papua New Guinea to use natural geothermal energy for the generation of ...
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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 ...
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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 ...
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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 support from developed countries, must undertake ...
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As Global Demand for Electricity Grows, Geothermal Energy Heats Up
January 9, 2017 — At 2:46 p.m. local time on Friday, March 11, 2011, Japan was rocked by the largest earthquake ever to strike its shores. The 9.1 magnitude quake triggered a devastating tsunami that killed more than 15,000 people. It also took out the back-up emergency generators that cooled the reactors at the Fukushima Daiichi nuclear power plant complex, causing a series of catastrophic ...
By Ensia
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Case Study - 2.0 MW Nominal Geothermal Power Plant
Lake Naivasha, Kenya – 2007 Under a contract signed in June 2006 with Oserian, Geothermal Development Associates (GDA) agreed to design, manufacture, inspect, test, pack, and ship a 2 MW nominal geothermal steam turbine generator and related power plant auxiliary components from Reno, Nevada, USA to the Oserian flower-growing facility near Lake Naivasha, Kenya. GDA will provide technical ...
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