Geothermal energy and its application

It is a presentation given to instructor of Heat Transfer on geothermal energy and Its Applications.

1. Geothermal Energy and Its Application By- Aman Jain Priyanka Mittal

2. What is Geo Thermal Energy? Geothermal energy is defined as heat from the Earth. T he difference in temperature between the core of the planet and its surface, drives a continuous conduction of thermal energy in the form of heat from the core to the surface. R enewable Energy.

3. How does a conventional Geothermal reservoir work ? The heat from the Earth's core continuously flows outward . Sometimes the heat reaches the surface as lava, but it usually remains below the Earth's crust, heating nearby rock When water is heated by the earth’s heat, hot water or steam can be trapped in permeable and porous rocks under a layer of impermeable rock and a geothermal reservoir can form. This hot geothermal water can manifest itself on the surface as hot springs or geysers, but most of it stays deep underground, trapped in cracks and porous rock. This natural collection of hot water is called a geothermal reservoir.

4. Geothermal Energy Uses Electricity Production Heating Purpose Home Heating and cooling using geothermal heat pumps

5. Geothermal Power Plant Four Types- F lash power plants D ry steam power plants B inary power plants, F lash/binary combined power plants.

6. Flash power plants Geothermally heated water under pressure is separated in a surface vessel into steam and hot water The steam is delivered to the turbine, and the turbine powers a generator. The liquid is injected back into the reservoir.

7. Dry steam power plant Dry Steam Power Plant: Steam is produced directly from the geothermal reservoir to run the turbines that power the generator, and no separation is necessary because wells only produce steam

8. Binary power plant Binary plants typically use an Organic Rankine Cycle system . The geothermal water heats another liquid, such as isobutane or other organic fluids such as pentafluoropropane , which boils at a lower temperature than water. The two liquids are kept completely separate through the use of a heat exchanger, which transfers the heat energy from the geothermal water to the working fluid. The secondary fluid expands into gaseous vapor . The force of the expanding vapor , like steam, turns the turbines that power the generators.

9. Flash/binary combined power plants. This type of plant, which uses a combination of flash and binary technology, has been used effectively to take advantage of the benefits of both technologies. In this type of plant, the portion of the geothermal water which “flashes” to steam under reduced pressure is first converted to electricity with a backpressure steam turbine and the low-pressure steam exiting the backpressure turbine is condensed in a binary system.

10. References http:// geo-energy.org/Basics.aspx http:// en.wikipedia.org/wiki/Geothermal_energy http:// en.wikipedia.org/wiki/Hot_spring