Methods of Harnessing Energy What is Geothermal Energy?
Methods to Harness Energy What exactly is Geothermal Energy?
Geothermal is derived of Geothermal is the Greek word geo (meaning earth) and therein (meaning the word heat). Convective circulation plays a crucial part in bringing heat to the surface from heated interior of the Earth.
The Earth’s crust is the product of millions active volcanoes, massive amounts of magma and lots of cooling below the surface. This persistent and widespread volcanic activity has resulted in the creation of many precious natural resources throughout the world.
Geothermal Energy produced by power plants are extracted by groundwater that is heated by hot, large magma bodies. Get energy from Brantley 1994, Volcanoes in the United States. USGS General Interest Publication.
The deep circulation of groundwater in fracture zones can bring heat down to shallower levels. The heat is gathered across a vast area , and then concentrated in close to the surface storage tanks, or released in hot springs. These reservoirs can contain hot water or even a stream.
The hot water in these reservoirs or steam may be pumped directly to the surface. The low-energy waste water is frequently reinjected into storage tanks or used to heat the tank for. This technology can be used to produce electricity as in addition to heat for domestic as well as industrial purposes.
The reliability, economics, sustainability, and renewable nature of geothermal power have been proved (World Bank Group, 2004).
There are two primary types of resources: (1) high temperature resources and (2) moderate/low temperatures resources. Geothermal resources with high temperatures are those that have temperatures of 220 degrees Celsius or higher They are mostly found in volcanic areas and island chains.
Each continent has moderate to low temperature resources. The high temperatures are utilized mostly for power production, while the majority of the low temperature resources are used for direct heating or for agriculture and aquaculture.
How does Harnessing Geothermal Energy work?
Today, there are three kinds of geothermal power plants currently in use.
Steam power plants that use direct geothermal steam. The steam power plant that are dry make use of extreme heated steam (>455 degrees Fahrenheit, or >235 degree Celsius) and only a small amount of reservoir water. The steam moves directly through a pipe , and is sent to a turbine that spins a generator generate electricity. This is the oldest form of geothermal energy station. It was first used around 1904 at Lardarello, Italy. Geysers are found in North California are one example of dry steam production (Green Jobs 2002).
Flash Steam Plants use high pressure hot water to make steam when the temperature is low. Flash steam power plants make use of hot geothermal reservoirs at temperatures of greater than 360degF or more than 182 degrees Celsius. The reservoir’s pressure will be released once the reservoir is transferred into a generator.
A sudden decrease in pressure causes water to evaporate to steam. The steam spins a turbine which generates electricity. Dry steam and flash steam release only a small amount of carbon dioxide, sulfur oxide, and nitric oxide. This is however 50 % less than conventional fossil fuel power stations.
Binary Cycle Plants use water at moderate temperatures (225 to 360deg For 107 to 182degC) from the geothermal reserve. Geothermal fluids that are hot can be heated by going through the other side of the heat exchanger.
For electricity generation, the working fluid is typically an organic compound that has low boiling points such as Isobutane and Isopentane. It is then vaporized and then passed through turbines.
The Kalina Cycle is also a source of ammonia-water fluid as a working fluid. Based on Green Jobs 2002, the Kalina Cycle system increases geothermal plant efficiency as well as reducing construction costs. This, according to the company’s makers.
The geothermal power station which is shown here is located in Casa Diablo’s geothermal field. Idaho National Engineering and Environmental Laboratory.
Geothermal Energy: Applications
- Space/District Heating Schemes – Programs that use geothermal heat to supply more than 80percent of Reykjavik’s central heating requirements are used 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 replace coal-based district heating is being supported by the World Bank (World Bank Group 2004).
- Aquaculture and Agriculture Plants, thermal soils and fish ponds that exhibit geothermal energy can help enhance the growth of plants and fish even in moderate temperatures and more cold climates. A good example of this can be found in Oserian Farm in Kenya. Oserian farm located which is located in Kenya (World Flowers 2005).
- Power Generation Geothermal power generation has a capacity exceeding 8000 MW and is an established technology. It is especially well-known in nations or islands that rely heavily on fossil fuels imported from abroad (World Bank Group 2004).
Geothermal Energy Costs
The price of geothermal power generated can be as low as 4.5-7 cents/hour. Although this is similar to some fossil fuel facilities it must be remembered that geothermal power generation results in significant reductions in the amount of pollution.
The project’s size and its quality, as well as the cost of financing, as well as ownership will all affect the delivered costs.
Geothermal power plants require a significant amount of capital, but have relatively low variable costs and low energy costs.
The financing structure is usually so that the capital costs of the project are paid back within 15 years. It provides power at 5-10C/kWh.
The cost of running the facility for in the coming 15-30 years are covered by maintenance and operations.
Geothermal Energy has other benefits
- Air pollution can be reduced Geothermal fields currently emit around one-sixth the amount of CO2 as an electricity-generating gas power station, and produce no nitrogen (NOx) or sulfur (SOx).
The new state-of-the art combination cycle as well as geothermal binary plants emit almost no air pollution. Each 1,000 MW of geothermal power will help offset around 1.9 millions of pounds harmful as well as harmful pollution in Western skies.
It also will offset around 8 billion pounds of climate changing CO2 emissions from gas power plants that are fired and much more from coal-fired power plants.
- Energy sources that are renewable: all types of geothermal energy are renewable in the event that the heat exchangers that are extracted from the earth do not greater than the heat that is absorbed into the thermo reservoir. Once it has been depleted the geothermal reservoir that is that is used to generate electricity can be a long time to replenish.
Recovering the reservoir of a district heating system can take between 100 and 200 years. Recovering the geothermal heat pump reservoir can take as long as 30 years.
- Reduce the dependence on imported electricity: Geothermal energy is produced locally, which helps reduce trade deficits. Trade deficits can be cut to keep wealth in the country and promote healthier economies. If imported oil were substituted by domestic resources, almost 50% of the annual U.S. trade deficit could be reduced (Green Jobs 2004).
Geothermal energy is a well-established source of energy from waves that has been used for over 100 years. But, it’s only now that we realize it has geothermal energy potential to replace and/or augment our current renewable energy sources.
The United States has the majority of geothermal resources within the western region, including [region] and [region]. Geothermal energy is efficient cheap, clean, and safe, but this limited use seems to be its greatest weakness. Geothermal energy only accounts for a fraction of the solar power dispersed over the Earth’s surface in comparison to other options like solar. It has the potential to be improved.
Although geothermal energy units are capable of being developed, their techniques and technologies have remained virtually static. We must also think about the potential benefits for alternative sources of energy as we seek them out.
Five methods to tap into the{ original|| first} source of energy renewable Human power
Wind-up phone charger
Users of mobile phones who have a habit of staying connected should not get too far from their power source or fear their battery going out. Its “Reactor” iPhone case is embedded with an ultra-thin generator. It lets you manually charge your battery by turning the handle that’s plugged into its back. While this method of power generation might not be new, it sheds light on the possibility that human-power could be used to provide an emergency power source and is available when needed.
Gravity-powered light
Making a product that is powered by humans isn’t an easy task because it requires less effort to generate energy. Gravity Light solves this problem by using the potential of gravity. To lift the weight of the sandbag only requires one burst of power. The weight gradually drops to rotate a spur gear system that powers the LED light for twenty minutes.
Human harvesting
Parasitic harvesting refers to the process of producing wind power through regular activities such as walking. The NPowerPEG is a tube-shaped hand-held device that you can clip to your belt or backpack. It generates electricity from movement using a magnet, spring or an inductive coil. While it’s not enough energy to run high-wattage electronics such as laptops and tablets The concept is high performance in terms of energy and batteries.
Flywheel kitchen appliances
Modern technology powered by humans does not rely solely on the generation of electricity. Christoph Thetard’s flywheel drive RB2B power various kitchen appliances. The flywheel spins at 10,000 RPM through an geared transmission that has a mechanical power that is 350 W. The wave power can be used to power multiple attachments, including a knife, slicing disk and whisk. Although it’s not clear how practical this device is however, the creator deserves praise for introducing a concept that challenges the notion that devices powered by humans have to be portable and battery-powered.
