http://www.engineeringnews.co.za
  SEARCH
Login
R/€ = 14.06Change: 0.01
R/$ = 10.67Change: 0.01
Au 1292.35 $/ozChange: 9.55
Pt 1429.50 $/ozChange: 10.00
 
 
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|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||Energy|Power Generation|Power-generation|||Power|Turbines|Water|||
construction|concrete|hahn-hahn-md-alan-dunlop|project|turbines-company|water-company|germany|spain|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 Electricity News
Article contains comments
Deputy President Cyril Ramaphosa
Government has received more than 180 nominations for the yet-to-be-established Ministerial Advisory Council on Energy, Deputy President Cyril Ramaphosa said on Wednesday. "I have been informed by the department of energy that the proposed ministerial advisory...
The national power system was expected to be tight over the evening peaks this week, despite mild temperatures being forecast, State-owned power utility Eskom said on Monday, calling on consumers to pull together to help beat the peak. In its latest biweekly system...
The City of Cape Town has taken public transport to the next level with the launch of its first green transport facility. The Wallacedene taxi rank is the first public transport facility in the country to be regarded as a green building -- from its foundation to the...
Article contains comments
More
 
 
Latest News
Rory Schulz
Updated 2 hours 22 minutes ago The board of UD Trucks Southern Africa (UDTSA) on Thursday announced the resignation of MD Jacques Carelse.   Long-time UD employee, corporate planning and marketing GM, Rory Schulz, was appointed as acting MD while the process started to appoint a new MD. The...
Updated 2 hours 38 minutes ago The fuel levy is not an effective means of funding improvements to Gauteng's freeways, Consulting Engineers South Africa (Cesa) said on Thursday. "The fuel levy just spreads the burden among the entire population... roads have not really benefited from the fuel...
Updated 3 hours ago Construction, mining, development and engineering group Basil Read late on Wednesday posted heavy losses for the six months to June, as lossmaking contracts, a “difficult” contractual environment, labour unrest and slow infrastructure spend weighed on the...
More
 
 
Recent Research Reports
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...
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.
Real Economy Insight: Road and Rail 2014 (PDF Report)
This six-page brief covers key developments in the road and rail industries over the past 12 months, including details of South Africa’s road and rail network and prospects for both sectors.
 
 
 
 
 
This Week's Magazine
MODDERFONTEIN NEW CITY Modderfontein New City will aim to exemplify an integrated city node and improve infrastructure utilisation through mixed-use spaces
The multibillion-rand development of the Zendai Modderfontein New City, east of Johannesburg, will aim to exemplify an integrated city node, says property group Zendai South Africa COO Wenhui Du. The development will focus on the Modderfontein Gautrain station to be...
The South African Civil Aviation Authority (CAA) hopes to have finalised regulations for the flying of Unmanned Air Vehicles (UAVs) – also designated Remotely Piloted Air Systems (RPAS) and popularly called drones – in the country’s civilian airspace by the end...
Various stakeholders have expressed optimism that the Small Business Development Ministry, created after the national elections in May, will add much needed impetus to enterprise development in South Africa, where a strengthening of the entrepreneurial culture is...
BOB SCHOLES To ensure that emissions plateau by 2020 and then decline until a net negative emission level is achieved by the end of the century, CO2 capture and storage in addition to major emission reduction efforts will be needed
Capturing and storing carbon dioxide (CO2) is the only way through which the world will achieve the lowest of the United Nations Framework Convention on Climate Change’s (UNFCCC) global warming predictions, called the representative concentration pathway (RCP) 2.6....
PARKS TAU Ongoing investigations had identified at least 30 large power users in Johannesburg as having defrauded the city
The City of Johannesburg has recovered R107-million following the arrest of 22 people allegedly involved in corruption, collusion, fraud and tampering with the city’s electricity systems, which had ultimately cost the city R200-million in lost revenue.
 
 
 
 
 
 
 
 
 
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