Methods of Harnessing Energy What exactly is Geothermal Energy?
Methods to Harness Energy What exactly is Geothermal Energy?
Geothermal is derived of geothermal, which is derived from the Greek words geo (meaning earth) and (meaning warmth). Convective circulation plays a significant role in bringing heat to the surface from heated interior of the Earth.
The Earth’s crust is the result of millions of active volcanoes, massive amounts of magma and lots of cooling beneath the surface. The constant and extensive volcanism has produced many valuable natural resources throughout the world.
Geothermal Energy produced by power plants can be extracted from groundwater that has been heated by large, hot magma bodies. Get the energy of Brantley 1994 Volcanoes in the United States. USGS General Interest Publication.
The deep circulation of groundwater around fracture zones can bring heat down to shallower levels. This heat can be gathered across a vast region and then concentrated near the surface storage tanks, or discharged into hot springs. The reservoirs could contain hot water or even a stream.
The reservoirs’ hot water or steam may be pumped directly to the surface. The waste water that is low in energy is usually reinjected into the storage tank , or utilized for heating purposes. This technique can be utilized to generate electricity as in addition to heat for domestic as well as industrial purposes.
The reliability, economy sustainable, the renewable energy of geothermal energy have been demonstrated (World Bank Group 2004).
There are two primary types of resources: (1) high temperature resources and (2) moderate or low temperatures resources. Geothermal resources that are high temperature that can attain temperature of 220° Celsius or more typically, are found in volcanic areas as well as island chains.
All continents have moderate-low temperature resources. The high temperatures are utilized nearly exclusively for power generation however, the majority of low temperature resources are used for direct heating or for aquaculture and agriculture.
What is the process behind Harnessing Geothermal Energy function?
There are currently three types of geothermal power stations in operation.
Steam plants that directly utilize geothermal steam. These power stations that are dry use very hot steam (>455 degrees Fahrenheit, or >235 degrees Celsius) and very little reservoir water. The steam is pumped straight through a tube and is then sent to a turbine which spins a generator in order to produce electricity. It is the earliest type of geothermal power station. It first was used in 1904 in Lardarello, Italy. Geysers in North California are one example of dry steam production (Green Jobs 2002).
Flash Steam Plants use high pressure hot water to produce steam when the pressure is lower. The flash steam plants use hot geothermal reservoirs at temperatures of greater than 360degF or 182 degrees Celsius. The deep reservoir pressure can be released after the reservoir is delivered into a generator.
A sudden drop in pressure causes some water to evaporate into steam. The steam spins a motor which generates electricity. Dry steam and flash steam produce only a small amount of carbon dioxide, sulfur oxideand oxygen. But, this is 50 % less than conventional fossil fuel power plants.
Binary Cycle Plants use water at moderate temperatures (225 to 360degFor 107 up to 182degC) from the geothermal reserve. Hot geothermal fluids are heated in binary systems through moving through one end that of the exchanger.
In order to generate electricity, the working fluid is usually an organic compound that has low boiling points such as Isobutane and Isopentane. It is then vaporized and passed through turbines.
The Kalina Cycle is also a source of ammonia-water liquid as a working fluid. As per Green Jobs 2002, the Kalina Cycle system increases geothermal plant efficiency and reduces the cost of construction. This, according to the makers.
The station for geothermal energy which is shown here is located in the Casa Diablo geothermal field. Idaho National Engineering and Environmental Laboratory.
Geothermal Energy: Applications
- Space/District Heating - Schemes which use geothermal energy to supply more than 80percent of Reykjavik’s central heating needs are in use in many other cities across the USA, Poland, and Hungary. A plan to make use of hot water from{ failed|| a failed} oil fields in Poland to substitute district heating using coal is being backed by the World Bank (World Bank Group 2004).
- Aquaculture and Agriculture Plants, thermal soils and fish ponds that have geothermal activity can increase the growth of fish and plants in both moderate temperatures and colder climates. A good example of this is Oserian Farm in Kenya. Oserian farm located situated in Kenya (World Flowers 2005).
- Power Generation - Geothermal power generation can produce a power output exceeding 8000 MW and is an established technology. It is especially well-known in islands or countries which heavily rely on imported fossil fuels (World Bank Group 2004,).
Geothermal Energy Costs
The price of geothermal power generation can be as low as 4.5-7 cents per hour. While this is comparable to certain fossil fuel facilities, however, it should be noted that geothermal electricity generation is significant reductions in the amount of pollution.
The scope of the project along with its quality, the costs of financing and ownership will all affect the delivered costs.
Geothermal plants require a lot of capital investment, yet they have low variable costs and minimal energy costs.
The structure of financing is typically designed so that the capital expenses of the project will be to be paid back in 15 years. The project provides power at 5-10C/kWh.
The operating costs for the facility for fifteen to thirty years will be paid for by maintenance and operations.
Geothermal Energy has other advantages
- Air pollution can be reduced The current geothermal fields emit approximately one-sixth of the amount of CO2 that is produced by an electricity-generating gas power station, and they emit no nitrogen (NOx) or sulphur (SOx).
The latest state-of-the-art integrated cycle plants produce virtually no air pollutants. Each 1,000 MW of geothermal power will help offset around 1.9 million pounds of noxious as well as harmful pollution in Western skies.
It will also offset about 8 billion pounds of climate changing CO2 emissions per year from fired gas power plants and a lot more from the coal-fired power plants.
- Energy sources that are renewable: all types of geothermal heat are sustainable as long as the heat exchangers that are extracted from the earth are not greater than the heat absorbed from the reservoir. Once it has been depleted the geothermal reservoir that is utilized for power generation could take hundreds of years to replenish.
Recovering the reservoir of a district heating system could take anywhere between 100 and 200 years. The recovery of the reservoir of a geothermal heat pump could take up to 30 years.
- Reduce the dependence on imported electricity Geothermal energy is produced locally, which reduces trade deficits. Trade deficits can be cut to keep wealth in the country and promote healthy economies. If oil imported from abroad was replaced with domestic resources, more than half of the annual U.S. trade deficit could be removed (Green Jobs 2004).
Geothermal energy has been proven to be a source of energy from waves that has been in use for more than 100 years. But, it’s only recently that we are able to see the potential of geothermal energy to supplement or replace our current renewable energy sources.
It is believed that the United States has the majority of the geothermal resources located throughout the West, including [region] and. Geothermal energy is reliable cost-effective, safe, and clean however, its limited usage appears to be its main flaw. Geothermal energy is only one-third of solar power that is dispersed on the earth’s surface, in comparison to other options like solar. There is the potential to be improved.
Although geothermal energy units are capable of being extended, their processes and techniques have remained unchanged. We must also think about the potential benefits of alternative energy sources when we search for them.
Five ways to tap the{ original|| first} source of renewable energy Human power
Wind-up phone charger
Mobile phone users who are dedicated should not get too far from a power source or feel the fear of their battery running out. This “Reactor” iPhone case is fitted with a super-thin generator. It lets you charge your battery manually through the control that’s plugged into its back. While this method of energy generation may not be revolutionary, it sheds light on the possibility that human power could be used to provide emergency power and is readily available in times of need.
Light powered by gravity
Designing a human-powered product can be difficult because it requires less effort to generate energy. Gravity Light solves this problem by making use of the power of gravity. To lift the sandbag weight all it takes is one blast of energy. The weight gradually drops to turn a spur gear system that power the LED for 20 minutes.
Human harvesting
Parasitic harvesting refers to the process that generates wind power through regular activities such as walking. The NPowerPEG is a tube-shaped hand-held device that can be clipped to your backpack or belt. It generates power from motion with a spring, magnet, or inductive coil. While it’s not sufficient power for powerful electronics such as laptops and tablets, the concept has excellent performance in terms of energy and batteries.
Flywheel kitchen appliances
Modern technology powered by humans does not solely rely on the production of electricity. Christoph Thetard’s flywheel drive RB2B powers a range of kitchen appliances. The flywheel can spin at 10,000 RPM through an engineered transmission and a mechanical power of 350 W. The wave power can be used to run several attachments such as cutting disks, knives and whisk. Although it’s not clear what the practicality of this gadget is, the designer deserves credit for introducing a concept that challenges the notion that all devices that are powered by humans must be portable and powered by batteries.
