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Hybrid Energy Systems: Introduction And Definitions

Hybrid Energy Systems
The term hybrid energy system refers to those applications in which multiple energy unit conversion devices are used together to supply an energy requirement. These systems are often used in isolated applications and normally include at least one renewable energy source in the configuration. Hybrid energy systems are used an alternative to more conventional systems, which typically are based on a single fossil fuel source. Hybrid energy systems may also be used as part of distributed generation application in conventional electricity grid. (more…)

7.07.2011

Energy Technology and Modern Urbanization

The age of industrialization came into full force through the modern exploration and use of fossil fuels. As one of its most striking phenomena, the rapid expansion of cities throughout the late 19th and the 20th centuries was a direct outcome of the fossil fuel energy economy as well. (more…)

15.09.2010

The Role Of Nuclear Energy In Reducing Security Of Supply Risk

nuclear energy supply
Nuclear energy has some distinct advantages in strengthening the external dimension of energy supply security. These include:

Nuclear power plants produce electricity domestically. Their capital and labor inputs are also provided domestically. With more than 90% of its inputs in terms of value sourced domestically, it can be considered a largely domestic source of energy and electricity.

• Of course, a majority of OECD countries import part or all of their requirements of uranium plutonium. (more…)

28.08.2010

Energy Import Dependence, Resource Exhaustion and Carbon Policy

energy import dependence
Geopolitical risk refers almost always to primary energy carriers (oil, gas, coal, uranium or renewable energy) since their location depends on the vagaries of geology and climate. Production and energy consumption are thus often physically far apart and take place in countries and regions with different histories, cultures and values. Apart from oil & gas exploration and production, all other steps of the energy chain such as refinement or enrichment, energy conversion and distribution can be moved physically closer to the final customer or are, like consumption, directly under the latter’s control. (more…)

29.07.2010

Carbon Dynamics in Forest Ecosystems

The accumulation of carbon within a forest growth cycle can be considered in four stages. The initial establishment stage involves low global carbon cycle accumulation and may even experience net carbon loss (particularly from soil) as a result of site preparation and low biomass and bioenergy inputs. A rapid uptake of carbon is then experienced during the second phase, known as the full vigor stage, which subsequently levels off as the stand reaches the mature stage. Finally, the forest reaches old growth and the carbon is in steady state with accumulation associated with new growth balanced by mortality and disturbances. (more…)

12.07.2010

Hydrogen: The Fuel of the Future

hydrogen fuel
Most production systems try to become first full-scale production begins as small toys and devices of concept. The Horizon hydrogen car is an example.

Many people are aware of the need to reduce carbon dioxide emissions. One of the main culprits, of course, are emissions from automotive. (more…)

19.06.2010

Choosing Alternative Energy Investment – Funds and Stocks Market

With popularity of clean energy, the reduction of carbon and the movement toward earth friendliness, it seems that investment in alternative energy fund would be virtually no risk. But like any new industry, there is no guarantee that all sectors of the market will be successful. Since the technology bubble, which began in the early and mid 90s the market for alternative energy will soon separate winners from losers. If you are lucky or wise enough to choose an achiever, you soon will be getting great gain in your investment. On the other hand, losses are for those who have taken up the approximation that was not well received by the substantial market. (more…)

18.04.2010

Bioenergy as Carbon Neutral Energy Source

Bioenergy produced from biomass is sometimes called a carbon-neutral energy source, because the same quantity of carbon released when the biomass is burned is sequestered again when the crop or forest is re-grown. Referring to bioenergy as carbon neutral or having zero net emissions may be misleading; there are emissions associated with producing biomass, such as from fossil fuel used in cultivation, harvest, processing and transport, and in manufacture and construction of fuel conversion technology. (more…)

13.04.2010

Bioenergy Life Cycles Assessment | Green House Gases Emissions

bioenergy greenhouse
The quantification of the actual reduction in green house gases sourcess emissions resulting from the substitution of fossil fuels with energy from waste biomass requires a complete lifecycle assessment (LCA). A systematic framework for estimating the net Green House Gases emissions from bioenergy systems and comparing them against the fossil fuel reference system that it would replace has been developed. The major considerations of the life cycle assessment approach to quantifying the greenhouse impacts of bioenergy are as follows: (more…)

28.02.2010

Greenhouse Gases Sources and Climate Change

climate change greenhouse gases
It is of interest to examine potential sources of greenhouse gases sources or atmospheric CO2 by analysis of the global distribution of carbon in all its forms. Atmospheric carbon, which can be assumed to be essentially all in the form of CO2 (i.e., 700 Gt carbon equals 2570 Gt of CO2) comprises only about 1.6% of total global carbon, excluding lithospheric carbon. Obvious greenhouse gases sources of direct or indirect additions of CO2 to the atmosphere are therefore fossil fuel deposits, since portions of them are combusted each year as fuels, and terrestrial biomass. (more…)

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