Geothermal Articles
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Wolselely`s Sustainable Building Centre: Showcasing the now
This European and North American building products wholesaler employs more than 80,000 people in 5,000 distribution centres, including 1,800 branches across the UK. One of the newest additions to the network is in Leamington Spa and is designed to showcase sustainable building technology. Business insight The construction sector has a key role to play in relation to a range of ...
By Article 13
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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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Bio-SNG featured in energy world in February 2011
The use of bio-fuels for heating and lighting pre-dates the use of fossil fuels by thousands of years. However, unlike with fossil fuels, a systematic knowledge of the challenges posed by solid bio-fuels is not as widely understood, a fact attributable to the exponential acceleration of fossil fuel usage as global demand increased during the industrial revolution. In the wake of this, producers ...
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SGBI opinion article: shale gas
Government perceives electric vehicles to be a panacea that will solve problems surrounding air quality and CO2 emissions simultaneously. The EV has two main selling points: reduced CO2 emissions and high efficiency. However, these are only valid at a superficial level and the argument disintegrates under any level of scrutiny. In terms of CO2 emissions, EVs replace ‘average’ cars to ...
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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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Investigation of some renewable energy and exergy parameters for two Geothermal District Heating Systems
In this study, three new exergy parameters, namely total exergy destruction ratio, component exergy destruction ratio and dimensionless exergy destruction are introduced in addition to energetic renewability ratio, exergetic renewability ratio, energetic reinjection ratio and exergetic reinjection ratio, and compared for Edremit and Bigadic Geothermal District Heating Systems (GDHSs) based on ...
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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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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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Renewables account for 11%+ of U.S. electricity production
Renewable energy, including wind, solar, biomass, biofuel, geothermal, and hydroelectric sources, accounted for 11.14% of U.S. electricity production during the first six months of 2010, according to the most recent issue of Monthly Energy Review by the U.S. Energy Information Administration (EIA). The 11.14% figure marks continued growth for U.S. renewable energy, which accounted for 10.71% of ...
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France launches a major renewable energy investment programme
The French government launches a major programme to provide €1.35bn of financial support to the renewable sector over the next four years, reports Envido. The French government has launched a major renewable energy investment programme called: «Démonstrateurs et plates-formes technologiques en énergies renouvelables et décarbonées et chimie verte», ...
By Vital Energi
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What energy efficiency type are you?
By Elisa Wood July 29, 2010 Not so long ago, consumers seemed to like energy efficiency just a little bit more than going to the dentist. Clearly that has changed, as evidenced by the recent run on appliance and home retrofit subsidies in several states. Greens are no longer alone in swooning over front loader washing machines and geothermal heat pumps. But who exactly are these new energy ...
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The UK lags behind EU counterparts to achieve 20% renewable energy target
While some countries have almost hit their targets the UK still has a long way to achieve its 15% renewable energy target by 2020. The EU is more than halfway to reaching its 20% target of generating energy from renewables by 2020, according to new figures published today by Eurostat. The EU's 2009 directive on renewable energy set individual targets for all 27 member states, with a goal for the ...
By Vital Energi
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Second law based performance analysis of seawater source cascade heat pump system: a case study
This paper presents the second law based analysis of a seawater source cascade heat pump system operating with two different refrigerants. The present cascade heat pump system consists of two different heat pumps attached in such a way that the condenser of the first stage heat pump is the evaporator for the second heat pump and the condenser of the second heat pump is attached to the place to be ...
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Coal-fired power on the way out?
The past two years have witnessed the emergence of a powerful movement opposing the construction of new coal-fired power plants in the United States. Initially led by environmental groups, both national and local, it has since been joined by prominent national political leaders and many state governors. The principal reason for opposing coal plants is that they are changing the earth’s climate. ...
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Smarter grids, appliances, and consumers
More and more utilities are beginning to realize that building large power plants just to handle peak daily and seasonal demand is a very costly way of managing an electricity system. Existing electricity grids are typically a patchwork of local grids that are simultaneously inefficient, wasteful, and dysfunctional in that they often are unable, for example, to move electricity surpluses to areas ...
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Permeable (pervious) pavements and geothermal heat pumps: addressing sustainable urban stormwater management and renewable energy
Water and energy are the two most fundamental ingredients of modern civilisation and are also the most precious and essential resources around the globe. They are inseparably coupled and with increasing pressures on these resources as the world's populations grow, the concepts of a combined approach can be applied while addressing the economic, climate, water and energy crises. Sustainable ...
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Closing the last Energy Leak
The heat contained in wastewater is one of the last major untapped resources in the field of renewable energies, despite the fact that it may some day provide some 20% of the heating energy we need. This huge potential has been addressed by a Swiss engineering office, Rabtherm AG, which now supplies patented technology for generating energy from wastewater, used for heating or cooling buildings. ...
By RABTHERM AG
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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 ...
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U.S. headed for massive decline in carbon emissions*
For years now, many members of Congress have insisted that cutting carbon emissions was difficult, if not impossible. It is not. During the two years since 2007, carbon emissions have dropped 9 percent. While part of this drop is from the recession, part of it is also from efficiency gains and from replacing coal with natural gas, wind, solar, and geothermal energy. The United States has ended ...
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Could food shortages bring down civilization?
“In early 2008, Saudi Arabia announced that, after being self-sufficient in wheat for over 20 years, the non-replenishable aquifer it had been pumping for irrigation was largely depleted,” writes Lester R. Brown in his new book, Plan B 4.0: Mobilizing to Save Civilization (W.W. Norton & Company). “In response, officials said they would reduce their wheat harvest by one eighth each year ...
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