http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 13.77Change: -0.07
R/$ = 11.07Change: -0.11
Au 1167.10 $/ozChange: -24.80
Pt 1202.00 $/ozChange: -17.50
 
 
Note: Search is limited to the most recent 250 articles. Set date range to access earlier articles.
Where? With... When?








Start
 
End
 
 
And must exclude these words...
Close Main Search
Close Main Login
My Profile News Alerts Newsletters Logout Close Main Profile
 
Agriculture   Automotive   Chemicals   Competition Policy   Construction   Defence   Economy   Electricity   Energy   Environment   ICT   Metals   Mining   Science and Technology   Services   Trade   Transport & Logistics   Water  
What's On Press Office Tenders Suppliers Directory Research Jobs Announcements Contact Us
 
 
 
RSS Feed
Article   Comments   Other News   Research   Magazine  
 
 
Jul 25, 2008

Solar tower sheds light on little-used technology

Back
Construction|Concrete|Hahn & Hahn MD Alan Dunlop|PROJECT|Turbines|Water|Germany|Spain|Building|Electricity|Energy|Power Generation|Power-generation|Solar Tower Technology|German Government|Jorg Schlaich|Power|Turbines|Water|Koss R-200 Consumer Headphones|The Namibian|Solar Tower Technology|Thermodynamics
Construction|Concrete|PROJECT|Turbines|Water||Building|Energy|Power Generation|Power-generation|||Power|Turbines|Water|||
construction|concrete|hahn-hahn-md-alan-dunlop|project|turbines-company|water-company|germany|spain|building|electricity|energy|power-generation|power-generation-industry-term|solar-tower-technology|german-government|jorg-schlaich|power|turbines-person|water|koss-r-200-consumer-headphones|the-namibian|solar-tower-technology-technology|thermodynamics
© Reuse this A



new proposal involving the construction of a R1-billion solar tower that will be able to generate 400 MW of electricity has been approved by the Namibian gov- ernment, says intellectual property company Hahn & Hahn MD Alan Dunlop.

The proposal states that the solar tower, aptly named the Greentower, will be 1,5 km high and 280 m in diameter. Dunlop says that the tower can be likened to a chimney that would cause an updraft to the drive turbines, generating 400 MW of electrical power.

Air within the solar tower is heated in a large circular green-houselike structure, and the resulting convection causes the air to rise and escape through the tower. The moving air drives turbines, which then produce electricity.

Solar tower technology has been slow to develop over the last 30 years. Between 1979 and 1989, a German engineer, Professor Jorg Schlaich, designed a solar tower 200 m high, which was built in Spain and financed by a grant from the German government. The tower ran trouble-free for eight years, producing 50 kW of electricity, until it was decommissioned.

Dunlop states that interest in the technology faded in the 1990s, until it was announced that a 1 km-high solar tower, capable of producing 200 MW would be constructed, and would be functional, in Aus-tralia by 2010.

Turbines can be installed in a ring around the base of the tower, with a horizontal axis, as planned for the Australian project, or, as in the prototype in Spain, a single vertical axis turbine can be installed inside the chimney.

He adds that the Australian tower, as well as its Namibian counterpart, will be built out of reinforced concrete, using technology developed for building high-rise buildings.

“Several thermodynamics, civil struc-ture, wind loading and power generation experts have developed an executive summary for a R6-million prefeasibility study, and a R200-million bankable feasibility study for the Namibian project,” he says.
The Namibian government has declared its support for the Greentower, and offered a guarantee of 50% of the prefeasibility funding upon private equity commitment.

In addition, it is proposed that the base of the tower will incorporate a 37-km2 greenhouse, in which cash crops can be grown.

The greenhouse will be used to develop soil humus to transform barren land to fer- tile soil that retains moisture and nutrients to enable rapid plant propagation.

Dunlop says that studies have shown that plant-linked humidity does not reduce the uplift in the tower by which the turbines are driven, and even represents a store of latent energy that can be drawn on after sunset.

Water for the plants in the greenhouse can be supplied by desalinating sea water or purifying groundwater, using known technology and a supply of energy, which is only a small fraction of the energy generated.

He adds that the Namibian project is eligible for carbon credits under the Kyoto Protocol and offers opportunities for countries such as Germany to further develop solar tower technology.

Edited by: Laura Tyrer
© Reuse this Comment Guidelines (150 word limit)
 
 
 
 
 
 
 
 
Other Renewable Energy News
POWER EQUIPMENT The SPX bolting system ensures accurate torque and tension levels on every bolt
Precision and hydraulic special service equipment manufacturer Power Team says its SPX bolting system, which it supplies to contracting companies in the South African wind energy sector, enables these companies to significantly increase windmill erection speed,...
ON THE MOVE The towers for the turbines necessitate their transportation in three or four segments
International heavy-lift and plant relocation specialist engineering firm Vanguard provided the transportation and erection services for nine 3 MW Sinovel wind turbines for the Van Stadens wind farm project, in the Eastern Cape, says Vanguard MD Bryan Hodgkinson. The...
PRODUCTION CAPACITY The new wind-turbine tower production factory is capable of producing 150 wind towers a year
Renewable energy industrial and logistics processes company GRI Renewable Industries in November opened a new R300-million wind-turbine tower production factory in Atlantis, Cape Town. “With South Africa currently in the grip of debilitating rolling black-outs and...
More
 
 
Latest News
Updated 4 hours ago South Africa’s National Treasury on Friday reissued its amended request for proposal (RFP) for the five-year multibillion-rand project to replace the legacy systems currently in use with an enterprise resource planning (ERP) solution for an integrated financial...
Systems Automation and Management Durban manager Weyers van der Merwe, Richards Bay dry bulk terminal manager Mandla Mpungose and Umfolozi TVET college principal Sam Zungu.
Updated 4 hours ago The handover of specialised computer equipment to the Umfolozi Technical and Vocational Education and Training College would address one of the greatest challenges faced by Transnet Port Terminals (TPT) at the Port of Richards Bay – a lack of skills in a highly...
Updated 5 hours ago Through hosting the WorldSkills 2014 competition’s mechatronic pre-national finals, industrial control and automation company Festo would promote and support skills development. Festo said the mechatronic competition would give schoolchildren, trainees and students...
More
 
 
Recent Research Reports
Defence 2014: A review of South Africa's defence industry (PDF Report)
Creamer Media’s Defence 2014 report examines South Africa’s defence industry, with particular focus on the key participants in the sector, the innovations that have come out of the sector, local and export demand, South Africa’s controversial multibillion-rand...
Road and Rail 2014: A review of South Africa's road and rail infrastructure (PDF report)
Creamer Media’s Road and Rail 2014 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail network, the funding and maintenance of these respective networks, and the push to move road...
Real Economy Year Book 2014 (PDF Report)
This edition drills down into the performance and outlook for a variety of sectors, including automotive, construction, electricity, transport, steel, water, coal, gold, iron-ore and platinum.
Real Economy Insight: Automotive 2014 (PDF Report)
This four-page brief covers key developments in the automotive industry over the past 12 months, including an overview of South Africa’s automotive market, trade figures, production and the policies influencing the sector.
Real Economy Insight: Construction 2014 (PDF Report)
This five-page brief covers key developments in the construction industry over the past 12 months. It provides an overview of the sector and includes details of employment in the sector, infrastructure and municipal spending, as well as insight into companies’...
Real Economy Insight: Electricity 2014 (PDF Report)
This five-page brief covers key developments in the electricity industry over the past 12 months, including details of State-owned power utility Eskom’s generation activities, funding and tariffs, independent power producers and prospects for the sector.
 
 
 
 
 
This Week's Magazine
As the City of Ekurhuleni continues its bid to develop the largely industrialised metropole into the continent’s first aerotropolis, executive mayor Mondli Gungubele has committed the city to creating a predictable, stable and enabling business environment in which...
While Ford Motor Company of Southern Africa (FMCSA) did not have “significant issues” with power supply in Gauteng, it was a different story in the Eastern Cape, said FMCSA and American Chamber of Commerce in South Africa president Jeff Nemeth earlier this month....
In 2000, exports into Africa from South Africa represented less than 5% of the turnover of Federal Mogul Motorparts Africa, with sales largely centred around Zimbabwe, Zambia, Malawi and Mozambique. Today, African exports represent 30% of sales, with trade expanded...
The Malawi government has launched a $50-million project to upgrade the Kamuzu barrage, on the Shire river, an outlet of Lake Malawi, which is used to control the flow of water from the lake to the lower Shire area. The project will run from this year to 2017 and...
  Our new Technical and Vocational Education and Training (TVET) Colleges will replace the Further Education and Training (FET) Colleges which have served us for the past twenty years.  The buildings will be the same and most of the staff will be the same but as the...
 
 
 
 
 
 
 
 
 
Alert Close
Embed Code Close
content
Research Reports Close
Research Reports are a product of the
Research Channel Africa. Reports can be bought individually or you can gain full access to all reports as part of a Research Channel Africa subscription.
Find Out More Buy Report
 
 
Close
Engineering News
Completely Re-Engineered
Experience it now. Click here
*website to launch in a few weeks