Geotermal Energy

8/16/2019 Geotermal Energy

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ANADOLU UNIVERSITY

FACULTY OF ENGINEERING

DEPARTMENT OF CIVIL

ENGINEERING

FALL TERM of 2015-2016

İNŞ469 Geothermal energy

Khalid rida Absiye Aden Ahmed



Introduction

Geothermal energy comes from the heat within the earth. The word"geothermal" comes from the Greek words geo, meaning earth," and

therme, meaning "heat." People around the world use geothermal energyto produce electricity, to heat buildings and greenhouses, and for otherpurposes.

The earth's core lies almost 2500 kilometers beneath the earth's surface.The double-layered core is made up of very hot molten iron surroundinga solid iron center. Estimates of the temperature of the core range from5,000 to 10,000 degrees Celsus (C). Heat is continuously producedwithin the earth by the slow decay of radioactive particles that is natural

in all rocks.

Surrounding the earth's core is the mantle, thought to be partly rock andpartly magma. The mantle is about 1000 kilometers thick. The outermostlayer of the earth, the insulating crust, is not one continuous sheet ofrock, like the shell of an egg, but is broken into pieces called plates.

These slabs of continents and ocean floor drift apart and push againsteach other at the rate of about one inch per year in a process calledcontinental drift.

to producing electric

FLASH STEAM POWER PLANT

Flash Steam Power Plants are the most common form of geothermalpower plant. The hot water is pumped under great pressure to thesurface. When it reaches the surface the pressure is reduced and as aresult some of the water changes to steam. This produces a ‘blast’ ofsteam. The cooled water is returned to the reservoir to be heated by

geothermal rocks again.



Aim

The project we will work on will be small Flash steam power plant.

And we will investigate the energy given and the cost of the plant

İn the flash steam power plant heat become pressure accourding to theideal gas equation

PV=nRT

The pressure become force which will turne the turbine



Modulation

We consider a pipe of 150m length and diameter of 10 m

We conider that the pressure in down is 5000Kpa according to NASA(https://www.grc.nasa.gov/www/k12/WindTunnel/Activities/fluid_pressure.html)

Velocity at the inlet is 20 m/s according to this table

FluidVelocity

(ft/min) (m/s)

Air, 0-30 psi, steel pipe 4000 20

Assumptions

1. The pipe is fricionless and one dimensional .incompressible andirrotational2. Conservation of mass energy and momentum

Calculations

P2 =P 1 -9.81*150= 3528,5Kpa

https://www.grc.nasa.gov/www/k12/WindTunnel/Activities/fluid_pressure.html








Then the energy applied on the turbine will be

3528,5KW

İf we have a turbine with effincy of 0,6

We will get 2117,1 KW

Then we can get an energy of 7,62156 MW/h

Estimated that demand of electricity per person in less devloped countries is0,2 KW and in devloped countries 1,0 KW , thus 7 MW would serve 10,000 to35,000 peopole with electricity

İf the cost range from 0,05 to 0,07 dollar to kwh during 12 years we will earn

20,000,000 dolars so it will be benifating for us after only 8 years.



Conclusion

Geothermal energy is a sustainble energy with long life span which is verybenefictal in rural places which transportation is costy .

Geotermal Energy

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