Geothermal Articles
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Sustainable cooling solutions for application in Western Cape Province, South Africa
The energy demand in building sectors for summer air–conditioning is growing exponentially due to global warming, increased living standards and occupant comfort demands throughout the last decades. Concerns over these environmental changes have begun shifting the emphasis from current cooling methods, to 'sustainable strategies' of achieving equally comfortable conditions in building interiors. ...
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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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Performance assessment of an integrated absorption cooling–hydrogen liquefaction system using geothermal energy
An integrated geothermal based triple effect absorption cooling and Linde–Hampson system for hydrogen gas liquefaction is proposed and analysed thermodynamically. The effect of various operating conditions and parameters on the system performance is studied. The results show that the mass of hydrogen gas pre–cooled by the absorption system per unit mass flow rate of geothermal water flowing ...
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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 share his experience. Why I Went I was fortunate enough to have my first experience ...
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Dynamic simulation and 2D multiple scales and multiple sources within basin geothermal field
In order to accurately describe the geothermal field within a basin, it is necessary to divide it into the normal geothermal field and additional geothermal field. For the accuracy by describing of the additional geothermal field, grids need to be increased. Traditional unequal interval difference method can be used to solve this problem, which has to increase grids within the unnecessary area, ...
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Exergetic and sustainability performance assessment of geothermal (ground source) ejector heat pumps
Although ejectors have been used in cooling/refrigeration and Heat Pumps (HP) applications for a long time, utilisation of Geothermal Ejector Heat Pump (GEHP) with Ground–Heat Exchanger (GHE) is a new idea, which has recently appeared in the literature. In this study, we model a GEHP system with a GHE in terms of exergetic aspects and apply our model to this system in the heating mode. The system ...
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Electricity production from geothermal sources by binary system; choosing secondary fluids
Because of the increasing prices of fossil fuels and the demand for cleaner electricity production, many sources of renewable energy have been proposed. Although Turkey has the seventh highest geothermal potential in the world and the second highest in Europe, electricity generation from geothermal energy is quite low. The purpose of this article is to search for the possibility of electrical ...
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Asia-Pacific Analysis: Go green not nuclear
Crispin Maslog says the region should follow the Philippines' lead and focus on renewable, not nuclear power. A year after the Fukushima nuclear disaster, questions remain over the role of nuclear power in the developing world, including South-East Asia and the Pacific. Nuclear power had a renaissance, driven by rapidly growing energy demands, and fading memories of high-profile disasters at ...
By SciDev.Net
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The right mix: the Philippines achieving its renewable energy goals
The global energy system is undergoing a transition from fossil fuels to renewable energy. There are clear signs that the pace of change is accelerating. 2009 was the second year in a row that more money was invested worldwide in renewable electricity generation projects than in fossil fuel-powered plants, according to data published by the United Nations. Developing countries, especially in ...
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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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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, ...
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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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Performance analysis of the different Organic Rankine Cycles (ORCs) using dry fluids
This paper presents the first and second laws of thermodynamics analysis for organic Rankine cycles (ORCs), using dry organic fluids as the working fluids. The dry organic fluids for this study were R227ea, RC318, R236fa, Isobutane, R600a, R245fa, HFE7000, R123 and R113. Effects of the operating parameters such as turbine inlet temperature and pressure on the thermal efficiency, exergy ...
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Federal energy stimulus: The check is in the mail
Energy efficiency companies waiting for federal stimulus money probably feel like they are being told, “The check is in the mail.” It is supposed to arrive, but when?The federal government will channel a large pot of the money through state agencies, so it is wise to keep an eye on announcements by governors and state energy offices. States must apply by May 12 for $3.1 billion in what is known ...
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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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Evaluation of a process simulator for modelling and analysis of Rankine cycle steam power plants
Applicability of the HYSYS process simulation package to thermodynamic modelling and analysis of Rankine cycle steam power plants, using first and second law analyses, has been evaluated. Theoretical Rankine cycles, and more realistic cycles based on power plants modelled in other studies, were simulated. Energy, exergy and efficiency values determined from the simulations were compared to those ...
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Building New Industries and Creating New Jobs in a Plan B Economy
Building a new economy, one that can sustain economic progress, involves phasing out old industries, restructuring existing ones, and creating new ones. This new economy will be powered by renewable sources of energy, will have a more diverse transport system--relying more on rail, buses, and bicycles, and less on cars--and will recycle everything. For example, coal use will be phased out, ...
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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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Peak Oil – Peak Opportunity?
Possibility and public policies can harness renewable energy technologies for a bright future “Alternative” fuels are nothing new. In fact, they were the mainstream power source a century ago. Rudolph Diesel built his engine to run on peanut oil. Henry Ford designed the Model T to run on ethanol. Wind delivered a significant source of power in the last century. Cheap gasoline (and ...
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Cost Effective Desulfurization of Gas Streams
The LO-CAT® II process provides cost effective H2S removal for all types of gas streams in many different industries. The LO-CAT and LO-CAT II processes have achieved H2S removal efficiencies of 99.9+% in many different applications and industries. These applications include natural gas production, oil refining, biogas, landfill gas, coke oven gas, geothermal steam power production, CO2 ...
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