Techniques for Harnessing Energy What is Geothermal Energy?
Techniques for Harnessing Energy What is Geothermal Energy?
Geothermal comes of the Greek word geo (meaning earth) and therein (meaning heat). Convective circulation plays a significant part in bringing heat to the surface from the Earth’s hot interior.
The Earth’s crust is the product of millions active volcanoes, massive amounts of magma and a lot of cooling below the surface. This persistent and widespread volcanism has created a wealth of natural resources throughout the world.
Geothermal Energy from power plants are extracted by groundwater that has been heated by large, hot magma bodies. Get energy from Brantley 1994, Volcanoes located in the United States. USGS General Interest Publication.
Deep circulation of groundwater around fracture zones can reduce heat to lower levels. This heat can be gathered from a wide area , and then concentrated in close to the storage tanks on the surface, or it can be discharged into hot springs. These reservoirs may hold hot water or even a stream.
The reservoirs’ hot water or steam can be directly pumped into the surface. The low-energy waste water is usually reinjected into storage tanks or used for heating purposes. This technology is able to produce electricity , as well as heat for domestic and industrial use.
The reliability, economics sustainable, green nature of geothermal energy has been proved (World Bank Group, 2004).
There are typically two main kinds of minerals: (1) high temperature resources and (2) moderate/low temperatures resources. High temperature geothermal resources are those that have temperatures as high as 220 degrees Celsius or higher typically, are located in volcanic regions and islands chains.
Every continent has moderate-low temperature resources. High temperatures are used almost exclusively for power production however, the majority of low temperature resources are used for direct heating or for aquaculture and agriculture.
How does Harnessing Geothermal Energy work?
Today, there are three types of geothermal power plants currently in use.
Steam plants that directly utilize geothermal steam. The steam power plant that use dry steam use extreme hot steam (>455 degrees Fahrenheit or more than 235 degrees Celsius) and very little reservoir water. The steam is pumped directly through a pipe , and is sent to a turbine that spins a generator to generate electricity. It is the earliest type of geothermal energy facility. It was first utilized by 1904 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 create steam even when tension is less. The flash steam plants use hot geothermal reservoirs at a temperature of >360degF or more than 182 degrees Celsius. The pressure in the reservoir can be released after the water is delivered into the generator.
A sudden drop in pressure can cause some water to evaporate to steam. This steam spins a turbine which generates electricity. Steam power plant flash and dry release very little carbon dioxide, sulfur oxideand Ox. This is however 50 times less than traditional fossil fuel power stations.
Binary Cycle Plants use water at moderate temperatures (225 to 360degFor 107 up to 182degC) from the geothermal reserve. Hot geothermal fluids can be heated by passing through one side of the exchanger.
In order to generate electricity the fluid used is usually an organic compound that has low boiling points, such as Isobutane or 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. According to Green Jobs 2002, the Kalina Cycle system increases geothermal plant efficiency and lowers construction costs. According to the makers.
The station for geothermal energy which is shown here is located in Casa Diablo’s geothermal field. Idaho National Engineering and Environmental Laboratory.
Geothermal Energy Applications
- Space/District Heating - Plans which use geothermal energy to provide more than 80% of Reykjavik’s central heating requirements are used in other cities in the USA, Poland, and Hungary. A plan to make use of hot water from{ failed|| a failed} oil fields in Poland to replace district heating based on coal is being supported through the World Bank (World Bank Group 2004).
- Aquaculture and Agriculture - Plants, soils and fish ponds that exhibit geothermal activity can increase the growth of fish and plants in both moderate temperatures and cooler climates. A good example of this is Oserian Farm in Kenya. Oserian Farm situated in Kenya (World Flowers 2005).
- Power Generation - Geothermal power generation has a capability of more than 8000 megawatts and is an established technology. It is particularly popular in nations or islands which heavily rely on fossil fuels imported from abroad (World Bank Group 2004).
Geothermal Energy Costs
The cost of geothermal energy generated can be as low as 4.5-7 cents per hour. While this is comparable to certain fossil fuel facilities, it must be remembered that geothermal power generation results in significant reductions in pollution.
The scope of the project, its quality, cost of financing, as well as ownership all influence the costs of the project.
Geothermal energy plants need a lot of capital investment, yet they have low variable costs and minimal energy costs.
The financing structure is usually designed so that the capital expenses of the project are paid back within 15 years. The project provides power at 5-10C/kWh.
The cost of running the facility over fifteen to thirty years is covered by maintenance and operations.
Geothermal Energy has other benefits
- Air pollution can be reduced Geothermal fields currently emit approximately one-sixth of the amount of carbon dioxide as power generated by a gas-powered electricity station, and they emit neither nitrogen (NOx) or sulfur (SOx).
The new state-of-the art combined cycle and geothermal binary plant emit virtually no air pollutants. Every 1,000 MW of geothermal energy will offset approximately 1.9 millions of pounds noxious pollutant air pollutants from Western skies.
It will also offset about eight billion pounds climate change Emissions of co2 per year generated by gas-fired power plants and many more fired coal power plants.
- Energy sources that are renewable: all kinds of geothermal heat are sustainable in the event that the heat exchangers extracted from the earth are not greater than the heat that is absorbed from the reservoir. When it’s depleted completely, a geothermal reservoir that is used to generate electricity can take hundreds of years to replenish.
Recovering a district heating system reservoir could take anywhere from 100 to 200 years. The recovery of the reservoir of a geothermal heat pump can take as long as 30 years.
- Reduce the dependence on imported electricity: Geothermal energy is produced locally, which decreases trade deficits. It is possible to have trade deficits reduced to preserve wealth within the country and help promote healthier economies. If imported oil were substituted by domestic resources, more than half of each year’s U.S. trade deficit could be reduced (Green Jobs 2004).
Geothermal energy is a proven source of energy from waves that has been used for over 100 years. It is only now that we realize it has geothermal energy potential to supplement or replace our existing renewable energy generated resources.
The United States has the majority of geothermal energy resources in the west, including [region] and [region]. Geothermal energy is efficient cheap, clean, and safe however, its limited usage is its biggest weakness. Geothermal energy only accounts for one-third of solar power dispersed over the Earth’s surface in comparison to other options like solar. It has potential for improvement.
Although geothermal energy units are capable of being expanded, their methods and technology have remained static. We should also consider the benefits for alternative sources of energy as we search for them.
Five ways to tap the{ original|| first} source of renewable energy - human power
Wind-up phone charger
Users of mobile phones who are persistent must not wander too far from a power source or fear their battery going out. This “Reactor” iPhone case is fitted with a super-thin generator. It allows you to charge your battery manually through the control that’s plugged into its back. While this method of energy generation might not be new but it provides the possibility that human-power could be used to provide an emergency power source and is available when needed.
Gravity-powered light
Designing a human-powered product isn’t an easy task because it requires less work to generate energy. Gravity Light solves this problem by making use of the potential of gravity. To lift the weight of the sandbag, all it takes is one burst of power. The weight will gradually drop to spin a spur gear mechanism, which powers the LED for 20 minutes.
Human harvesting
Parasitic harvesting is the method of producing wind power through normal activities such as walking. The nPowerPEG is a hand-held tube-shaped device that can be clipped to your belt or backpack. It generates power from motion using a magnet, spring or an inductive coil. While it’s not sufficient power for large-watt electronics such as laptops and tablets it does have excellent performance in terms of energy and batteries.
Flywheel kitchen appliances
Modern human-powered devices do not rely only on the production of electricity. Christoph Thetard’s mechanical flywheel drive RB2B power the kitchen with a variety of appliances. The flywheel spins at 10,000 RPM with an engineered transmission and a mechanical power supply of 350 W. The power of the wave can be used to power various attachments like a knife, slicing disk and whisk. Although it’s not clear what the practicality of this gadget is, the designer deserves credit for introducing a concept that challenges conventional notions that gadgets powered by humans need to be lightweight and battery-powered.
