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31-03-2010, 09:53 AM
Post: #1
Solar Tower Technology
hi pls send me the topic
02-04-2010, 01:41 PM
Post: #2
RE: Solar Tower Technology
SOLAR POWER TOWER
System Description:
Solar power towers generate electric power from sunlight by focusing concentrated solar radiation on a tower-mounted
heat exchanger (receiver). Many sun-tracking mirrors called heliostats are used to reflect the incident sunlight onto the receiver. utility-scale applications in the 30 to 400 MWe range can use this kind of towers.

molten-salt solar power tower:
In a molten-salt solar power tower, liquid salt at 290ºC (554ºF) is pumped from a ˜cold™ storage tank through the
receiver where it is heated to 565ºC (1,049ºF) and then on to a ˜hot™ tank for storage. hot salt is pumped to a steam generating system when power i needed. The hot salt produces superheated steam for a conventional Rankinecycle turbine/generator system.

Solar One. solar two:
They are operating power tower plants. Solar One, which operated from 1982 to 1988, was the worldâ„¢s largest power tower plant.It made large scale power production with power towers was feasible. Here, water was converted to steam in the receiver and used
directly to power a conventional Rankine-cycle steam turbine. The Solar One thermal storage system stored heat from solar-produced steam in a tank filled with rocks and sand using
oil as the heat-transfer fluid.
The goals of the redesigned plant, called Solar Two, are to validate nitrate salt technology, to reduce the technical and
economic risk of power towers, and to stimulate the commercialization of power tower technology.


For more details, refer this report:
http://www.solarpaces.org/CSP_Technology..._tower.pdf
http://en.wikipedia.org/wiki/Solar_updraft_tower

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08-10-2010, 09:51 AM
Post: #3
Thumbs Up RE: Solar Tower Technology

.doc  Solar power tower final.doc (Size: 58 KB / Downloads: 221)
SOLAR POWER TOWER


INTRODUCTION
The solar power tower (also known as 'Central Tower' power plants or 'Heliostat' power plants or power towers) is a type of solar furnace using a tower to receive the focused sunlight. It uses an array of flat, moveable mirrors (called heliostats) to focus the sun's rays upon a collector tower (the target). The high energy at this point of concentrated sunlight is transferred to a substance that can store the heat for later use. The more recent heat transfer material that has been successfully demonstrated is liquid sodium. Sodium is a metal with a high heat capacity, allowing that energy to be stored and drawn off throughout the evening. That energy can, in turn, be used to boil water for use in steam turbines. Water had originally been used as a heat transfer medium in earlier power tower versions (where the resultant steam was used to power a turbine). This system did not allow for power generation during the evening.
OVERVIEW
To date, the largest power towers ever built are the 10 MW Solar One and Solar Two plants. Assuming success of the Solar Two project, the next plants could be scaled-up to between 30 and 100 MW in size for utility grid connected applications in the Southwestern United States and/or international power markets. New peaking and intermediate power sources are needed today in many areas of the developing world. India, Egypt, and South Africa are locations that appear to be ideally suited for power tower development. As the technology matures, plants with up to a 400 MW rating appear feasible. As non-polluting energy sources become more favored, molten-salt power towers will have a high value because the thermal energy storage allows the plant to be dispatch able. Consequently, the value of power is worth more because a power tower plant can deliver energy during peak load times when it is more valuable. Energy storage also allows power tower plants to be designed and built with a range of annual capacity factors (20 to 65%). Combining high capacity factors and the fact that energy storage will allow power to be brought onto the grid in a controlled manner (i.e., by reducing electrical transients thus increasing the stability of the overall utility grid); total market penetration should be much higher than an intermittent solar technology without storage. One possible concern with the technology is the relatively high amount of land and water usage. This may become an important issue from a practical and environmental viewpoint since these plants are typically deployed within desert areas that often lack water and have fragile landscapes. Water usage at power towers is comparable to other Rankine cycle power technologies of similar size and annual performance. Land usage, although significant, is typically much less than that required for hydro [3] and is generally less than that required for fossil (e.g., oil, coal, natural gas), when the mining and exploration of land are include

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08-10-2010, 10:21 AM
Post: #4
Thumbs Up RE: Solar Tower Technology
Wink
.docx  SOLAR POWER TOWER123.docx (Size: 50.09 KB / Downloads: 121)
Solar thermal power tower



ABSTRACT
The Solar power station uses the Sun's heat to make steam, and drive a generator to make electricity. The station looks a little like the Odellio solar furnace , except that the mirrors are arranged in -circles around the "power tower".
As the Sun moves across the sky, the mirrors turn to keep the rays focused on the tower, where oil is heated to 3,000 degree Celsius, The heat from the oil is used to generate steam, which then drives a turbine, which in turn drives a generator capable of providing 10kW of electrical power. A large pressure tank, or “steam accumulator”, stores energy as pressurized hot water and allows the plant to continue generation in cloudy conditions for up to an hour.
Solar power tower was very expensive to build, but as fossil fuels run out and become more expensive, solar power stations may become a better option.


INTRODUCTION
The Solar thermal power tower (also knows as 'Central Tower' power plants or 'Heliostat' power plants or power towers) is a type of solar furnace using a tower to receive the focused sunlight. It uses an array of flat, moveable mirrors (called heliostats) to focus the sun's rays upon a collector tower (the target). The high energy at this point of concentrated sunlight is transferred to a substance that can store the heat for later use. The more recent heat transfer material that has been successfully demonstrated is liquid sodium. Sodium is a metal with a high heat capacity, allowing that energy to be stored and drawn off throughout the evening. That energy can, in turn, be used to boil water for use in steam turbines. Water had originally been used as a heat transfer medium in earlier power tower versions (where the resultant steam was used to power a turbine). This system did not allow for power generation during the evening. Their obvious advantages include that they w the sun for fuel and they do not pollute. Current studies predict commercial plants sized between 100 and 200 megawatts could supply power at a cost competitive with other sources. A 200- megawatt plant generates enough power for a city of about 200,000 people. The availability of efficient, low cost storage is a key advantage of power towers.

OVERVIEW
To date, the largest power towers ever built are the 10 MW Solar One and Solar Two plants. Assuming success of the Solar Two project, the next plants could be scaled-up to between 30 and 100 MW in size for utility grid connected applications in the Southwestern United States and/or international power markets. New peaking and intermediate power sources are needed today in many areas of the developing world. India, Egypt, and South Africa are locations that appear to be ideally suited for power tower development. As the technology matures, plants with up to a 400 MW rating appear feasible. As non-polluting energy sources become more favored, molten-salt power towers will have a high value because the thermal energy storage allows the plant to be dispatch able. Consequently, the value of power is worth more because a power tower plant can deliver energy during peak load times when it is more valuable. Energy storage also allows power tower plants to be designed and built with a range of annual capacity factors (20 to 65%). Combining high capacity factors and the fact that energy storage will allow power to be brought onto the grid in a controlled manner (i.e., by reducing electrical transients thus increasing the stability of the overall utility grid); total market penetration should be much higher than an intermittent solar technology without storage. One possible concern with the technology is the relatively high amount of land and water usage. This may become an important issue from a practical and environmental viewpoint since these plants are typically deployed within desert areas that often lack water and have fragile landscapes. Water usage at power towers is comparable to other Rankine cycle power technologies of similar size and annual performance. Land usage, although significant, is typically much less than that required for hydro [3] and is generally less than that required for fossil (e.g., oil, coal, natural gas), when the mining and exploration of land are include

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16-03-2011, 02:52 PM
Post: #5
RE: Solar Tower Technology

.doc  Copy of SOLAR TOWER papers.doc (Size: 339.5 KB / Downloads: 96)
SOLAR TOWER
INTRODUCTION:-

The sun's rays, or solar energy, have been used since the beginning of time and is vital to all living things. In addition to solar energy being a constant resource, heat and electricity are other forms of energy that can be made from solar energy. The largest advantage of solar energy is that it is a free and unlimited source of energy. Solar energy is also the cleanest energy source that does not compromise or add to global warming.
The solar tower is a concept invented with an intention to generate efficient green energy. Resembling an inverted funnel in shape, the solar tower is a huge source for generating renewable energy. The technology is based on the concept developed by renowned German structural engineer Professor Jorge Schlaich. The most fantastic thing about this new technology is the simplicity of its design, and its ingenious use of basic principles of physics to create energy.
HISTORY:-
 In 1903, Spanish Colonel of the Isadora Cabanyes first proposed a solar chimney power plant in the magazine La energía eléctrica.
 One of the earliest descriptions of a solar chimney power plant was written in 1931 by a German author, Hanns Günther.
Beginning in 1975, Robert E. Lucier applied for patents on a solar chimney electric power generator; between 1978 and 1981 these patents (since expired) were granted in Australia, Canada, Israel, and the USA. For many years Professor Jorge Schlaich and his team at Schlaich Bergermann and Partner (SBP) of Stuttgart, Germany, have been vitally interested in large scale solar energy applications. In the late 1970’s and early 1980’s the team developed a detailed proposal for a Solar Tower. An experimental 50kW capacity pilot plant was then built to SBP’s design in Manzanares, Spain, some 50km south of Madrid, which collapsed in a sand storm after six years.
PRINCIPLE:-
The solar updraft tower is a proposed type of renewable-energy power plant. It combines three old and proven technologies: the chimney effect, the greenhouse effect, and the wind turbine. Air is heated by sunshine and contained in a very large greenhouse-like structure known as collector, around the base of a tall chimney, and the resulting convection causes rising airflow to rise through the updraft tower. The air current from the greenhouse up the chimney drives turbines, which produce electricity. The generating ability of a solar updraft power plant depends primarily on two factors: the size of the collector area and chimney height. With a larger collector area, a greater volume of air is warmed to flow up the chimney; with a larger chimney height, the pressure difference increases the stack effect.
The tower works on centuries-old tried-and-true principles of updraft. This is the same principles used for chimneys in open fire places. The reason our house doesn't fill up with smoke when we light a fire in our fireplace, is due to the suction created by the hot air rising up through the chimney. This pulls the smoke up through the chimney as well. But in the case of the solar tower, we are not using a fire to create hot air. We are simply allowing the sun to heat stuff up. In this case, the sun heats the air up, and the air rises through the solar chimney as a result.
The ground under the collector absorbs some of the radiated energy during the day and releases it into the collector at night. This enables solar towers to produce a significant amount of electricity throughout the night.
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