SUNSOLAR CHIMNEYSCCOLLECTORAREA CA TURBINE GENERATED COUPLE TO GROUND THE TURBINE PCU
So, Why use a pipe or air channelto enclose the turbines? Why nothave a large "wind farm," withturbines mounted on towers in theopen air? ,
Answer: First, the wind turbinesenclosed in a pipe can produce 8times as much power for a givenwind speed than a turbine in the openair. Second, the wind farm conceptwould require a much larger numberof turbines. Also, the wind speed inthe open air around the collector issignificantly less than the air velocitythrough the air channel.
The Energy Storage In the CollectorSince collectors produce hot air bygreen house effect, to produceelectric during the night, tight water-filled tubes are placed under the roof,as seen in fıgure 12. Fig. 12 Principle of heat storage underneath the roof using water-filled black tubes.
•The water heats up during thedaytime and emits its heat at night.• These tubes are filled only once, nofurther water is needed, because thetubes remain closed after fillingprocess.• The volume of water in the tubes isselected to correspond to a waterlayer with a depth of 5 to 20 cmdepending on the desired poweroutput .
Cost“With the support of constructioncompanies, the glass industry andturbine manufacturers a rather exactcost estimate for a 200 MW solarchimney could be compiled. Weasked the utility "Energie BadenWürttemberg" to determine theenergy production costs compared tocoal- and combined cycle powerplants based on equal and commonmethods” .
The Mildura Solar ChimneyThe 1000m SolarChimney in Mildura,Australia, will be thehighest man-madestructure on Earth, andcan produce 500 GWh/year of electricity,providing power to200,000homes.Schematic seenof a construction of a Fig. 14 Construction of achimney is in figure 14. chimney.
•The cost to build the tower isestimated at $395 million. (About 14percent more than an equivalent coal-fired power station, and about 70percent more per installed megawattthan a comparable wind farm).
Details of the solar chimney are as follows:Location: Mildura, AustraliaType: Solar Tower power plant with steel-reinforced concrete tower and steel/glass solar aircollector (alternatively with polymer glazing)Features: The base of the tower will be between170 to 200 metres. The chimney is basically avery simple tube with wall thickness of 25cm,diameter of 150m and a height of 1000m. Thecollector roof will be 5000m in diameter.Power: Up to 500 Gigawatt hours per yearCompany: Enviromission LtdConstruction time: About 18-24 months
AdvantagesSolar chimney power stations areparticularly suitable for generatingelectricity in deserts and sun-richwasteland. It provides electricity 24 hour aday from solar energy alone.No fuel is needed. It needs nocooling water and is suitable inextreme drying regions.
It is particularly reliable and a littletrouble-prone compared with otherpower plants.The materials concrete, glass andsteel necessary for the building ofsolar chimney power stations areeverywhere in sufficient quantities. No ecological harm and noconsumption of resources.
DisadvantagesSome estimates say that the cost ofgenerating electricity from a solarchimney is 5x more than from a gasturbine. Although fuel is not required,solar chimneys have a very highcapital cost. The structure itself is massive andrequires a lot of engineering expertiseand materials to construct.
8.ConclusionSolar chimney power stations couldmake important contributions to theenergy supplies in Africa, Asia andAustralia, because there is plenty ofspace and sunlight available there.It is very important for the future,because our resources are limited,except our sun.