Solar Chimney Turbine Optimization

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Counter-rotating turbines for solar chimney power plants F. Denantes1, E. Bilgen Ecole Polytechnique, C.P. 6079 Centre Ville Montreal Qc, Canada H3C 3A7 Received 5 May 2005; accepted 13 September 2005 Available online 20 October 2005 doi:10.1016/j.renene.2005.09.018 "The main advantage of this turbine type in the solar chimney systems is its off-design performance. By considering that solar chimney power plants will be operated most of the time at a solar intensity of less than 800 W/m2. One other advantage is the reduced torque on each axis compared to the single-runner turbine. An operational improvement has also been shown."

TTT


Comparison of modelling approaches and layouts for solar chimney turbines T.P. Fluri *,1, T.W. von Backstro ̈m Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Stellenbosch 7602, South Africa Received 18 September 2006; received in revised form 19 July 2007; accepted 20 July 2007 Available online 17 August 2007 doi:10.1016/j.solener.2007.07.006

Summary: four models are considered: single and counter rotating turbines, with and without inlet guide vanes. Single without guide vanes is noticeably worse, while the other three are very similar. Optimal efficiency comes at the price of undesirable high torque.


TTT

A simplified analytical approach for evaluation of the optimal ratio of pressure drop across the turbine in solar chimney power plants S. Nizetic a,*, B. Klarin b aUniversity of Split, Faculty of Electrical and Mechanical Engineering and Naval Architecture, Department of Thermodynamics, Thermotechnics and Heat Engines, R.Boskovica b.b., 21000 Split, Croatia bUniversity of Split, Faculty of Electrical and Mechanical Engineering and Naval Architecture, LAHES – Laboratory for Aero and Hybrid Energy Systems, R.Boskovica b.b., 21000 Split, Croatia doi:10.1016/j.apenergy.2009.05.019

Summary: Turbine pressure drop (0.8-0.9) vs chimney pressure drop is analyzed.


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Performance analysis of the power conversion unit of a solar chimney power plant T.P. Fluri *, T.W. Von Backstro ̈m Department of Mechanical and Mechatronic Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa Received 18 September 2006; received in revised form 14 April 2008; accepted 8 May 2008 doi:10.1016/j.solener.2008.05.001

Summary: 80% Power conversion unit efficiency confirmed.

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Solar chimney turbine characteristics T.W. von Backstrom€ *, A.J. Gannon Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa Received 17 January 2003; received in revised form 5 August 2003; accepted 7 August 2003 doi:10.1016/j.solener.2003.08.009

Summary: peak turbine efficiency of 90% is possible, but only under certain conditions. Other people's estimates range from 40% to 83%.

Up: Solar Chimney