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Soenke Teichel M.S. Graduate Student Mechanical Engineering

Soenke Teichel M.S. Graduate Student Mechanical Engineering. Room: 1335 ERB. Email: teichel@wisc.edu. Home Town: Hannover, Germany. Thesis: Improvements of a Model of a Cavity Receiver in a Solar Tower. Technology Overview – Solar Tower.

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Soenke Teichel M.S. Graduate Student Mechanical Engineering

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  1. Soenke Teichel M.S. Graduate StudentMechanical Engineering Room: 1335 ERB Email: teichel@wisc.edu Home Town: Hannover, Germany Thesis: Improvements of a Model of a Cavity Receiver in a Solar Tower

  2. Technology Overview – Solar Tower Process flow diagram of the PS10 solar tower power plant. [1] • The heliostat field, evenly distributed on the northern hemicycle (PS10) around the tower, tracks the position of the sun and reflects radiation onto the cavity receiver. • Heat transfer fluid (HTF) (e.g. molten salt, steam, air) flows through tubes on the receiver surface and absorbs incident solar radiation. • Thermal energy is stored in large units to compensate for times when there is little or no solar radiation and during peak loads. • The HTF is routed into a heat exchanger to deliver heat for a steam cycle (Rankine, Brayton). • This cycle converts thermal energy into electricity with a nominal output of 11 MW (PS10).

  3. The cavity receiver is formed by welded tubes, which contain the heat transfer fluid. The receiver face approximates a semicircular cylinder shape. Cavity Receiver • Reflected radiation enters the cavity through a north-facing aperture. The heliostat field is built exclusively within the range of possible incidence angles onto the receiver. • The geometry of the cavity-type receiver reduces radiative and convective heat losses, forced convection losses depend significantly on the wind direction. PS10 cavity-type receiver . [2] SOLUCAR PS10 [3]

  4. The model of the cavity receiver is part of the “Solar Advisor Model” (SAM), an analysis software tool developed by the National Renewable Energy Laboratory (NREL). • This tool allows to examine and compare different solar technologies in respect of economical, technological and operational aspects. Project Objectives • A detailed model of a cavity receiver power tower was developed by Feierabend [4] which incorporates radiation, convection and conduction. • The objective of this project is to improve the heat loss model of the cavity receiver, by implementing semi-gray radiation heat transfer and to improve the correlations for natural and forced convection. References: [1] Romero, M., Buck, R. and Pacheco J. E. (2002). An Update on Solar Central Receiver Systems, Projects, and Technologies, Journal of Solar Energy Engineering, Vol. 124, pg. 98-108. [2] SolarPACES Home Page. Available at: http://www.solarpaces-csp.org/Tasks/Task1/ps10.htm [Accessed September 28, 2010]. [3] Alejandro Flores, SOLUCAR PS10, September 27, 2007, http://www.flickr.com/photos/afloresm/1448540190/ [4] Feierabend, L. (2010).Thermal Model Development and Simulation of a Cavity-Type Solar Central Receiver System, M.S. thesis University of Wisconsin - Madison - Solar Energy Laboratory

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