评估由二级集中器的中央接收器系统中的多个孔径引起的潜在改进Assessment of the potential improvement due to multiple apertures in central receiver systems with secondary concentrators.pdfVIP

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评估由二级集中器的中央接收器系统中的多个孔径引起的潜在改进Assessment of the potential improvement due to multiple apertures in central receiver systems with secondary concentrators.pdf

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Solar Energy 80 (2006) 111–120 /locate/solener Assessment of the potential improvement due to multiple apertures in central receiver systems with secondary concentrators Mark Schmitz a,*, Peter Schwarzbozl a, Reiner Buck b, Robert Pitz-Paal a ¨ a Deutsches Zentrum fur Luft- und Raumfahrt e.V. (DLR), Solar Research, Linder Hohe, 51147 Cologne, Germany ¨ ¨ b Deutsches Zentrum fur Luft- und Raumfahrt e.V. (DLR), Solar Research, Pfaﬀenwaldring 38-40, 70569 Stuttgart, Germany ¨ Received 9 August 2004; received in revised form 21 January 2005; accepted 11 February 2005 Available online 25 March 2005 Communicated by: Associate Editor Lorin Vant-Hull Abstract When striving for maximum eﬃciencies in solar thermal central receiver systems (CRS) the use of gas turbines with bottoming cycles is inevitable. Pressurized volumetric receivers have proven their feasibility and good performance, and their integration into gas turbine cycles has been demonstrated. One disadvantage of this system is the necessity to use secondary concentrators. The sunlight has to be concentrated into the relatively small glass windows of the receiver, which leads to a limited view cone. This means that of all the possible heliostat positions around the tower, only those within the ellipse, resulting from the section boundary of the view cone with the ground plane, are usable. For small systems, for which tower co