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Keywords

  • Central receiver power plant (2)
  • Central receiver system (2)
  • Concentrated solar collector (2)
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  • Solar concentration (2)
  • Concentrating solar power (1)
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Institute

  • Solar-Institut Jülich (40)
  • Fachbereich Energietechnik (15)

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Computational fluid flow of porous resic ceramic filtering modules and optimization of the channel edge form geometry (2008)
Spiros Alexopoulos ; Gerd Breitbach ; Bernhard Hoffschmidt ; P. Stobbe
Optimization of the geometry of porous SiC ceramic filtering modules using numerical methods (2008)
Spiros Alexopoulos ; Gerd Breitbach ; Bernhard Hoffschmidt ; P. Stobbe
Solar tower power plant in Germany and future perspectives of the development of the technology in Greece and Cyprus (2010)
Spiros Alexopoulos ; Bernhard Hoffschmidt
First Simulation Results for the Hybridization of Small Solar Power Tower Plants (2008)
Joachim Göttsche ; Bernhard Hoffschmidt ; Spiros Alexopoulos ; J. Funke ; P. Schwarzbözl
Solarthermische Kraftwerke mit thermischen Speichern (2010)
Spiros Alexopoulos ; Bernhard Hoffschmidt
Biogas systems: basics, biogas multifunction, principle of fermentation and hybrid application with a solar tower for the treatment of waste animal manure (2012)
Spiros Alexopoulos
Two of the main environmental problems of today’s society are the continuously increasing production of organic wastes as well as the increase of carbon dioxide in the atmosphere and the related green house effect. A way to solve these problems is the production of biogas. Biogas is a combustible gas consisting of methane, carbon dioxide and small amounts of other gases and trace elements. Production of biogas through anaerobic digestion of animal manure and slurries as well as of a wide range of digestible organic wastes and agricultural residues, converts these substrates into electricity and heat and offers a natural fertiliser for agriculture. The microbiological process of decomposition of organic matter, in the absence of oxygen takes place in reactors, called digesters. Biogas can be used as a fuel in a gas turbine or burner and can be used in a hybrid solar tower system offering a solution for waste treatment of agricultural and animal residues. A solar tower system consists of a heliostat field, which concentrates direct solar irradiation on an open volumetric central receiver. The receiver heats up ambient air to temperatures of around 700°C. The hot air’s heat energy is transferred to a steam Rankine cycle in a heat recovery steam generator (HRSG). The steam drives a steam turbine, which in turn drives a generator for producing electricity. In order to increase the operational hours of a solar tower power plant, a heat storage system and/ or hybridization may be considered. The advantage of solar-fossil hybrid power plants, compared to solar-only systems, lies in low additional investment costs due to an adaptable solar share and reduced technical and economical risks. On sunny days the hybrid system operates in a solar-only mode with the central receiver and on cloudy days and at night with the gas turbine only. As an alternative to methane gas, environmentally neutral biogas can be used for operating the gas turbine. Hence, the hybrid system is operated to 100% from renewable energy sources
High concentration solar collectors (2012)
Bernhard Hoffschmidt ; Spiros Alexopoulos ; Joachim Göttsche ; Markus Sauerborn
Solar thermal concentrated power is an emerging technology that provides clean electricity for the growing energy market. To the solar thermal concentrated power plant systems belong the parabolic trough, the Fresnel collector, the solar dish, and the central receiver system. For high-concentration solar collector systems, optical and thermal analysis is essential. There exist a number of measurement techniques and systems for the optical and thermal characterization of the efficiency of solar thermal concentrated systems. For each system, structure, components, and specific characteristics types are described. The chapter presents additionally an outline for the calculation of system performance and operation and maintenance topics. One main focus is set to the models of components and their construction details as well as different types on the market. In the later part of this chapter, different criteria for the choice of technology are analyzed in detail.
Concentrating solar power (2012)
Bernhard Hoffschmidt ; Spiros Alexopoulos ; Christoph Rau ; Johannes Sattler ; Anette Anthrakidis ; Cristiano Teixeira Boura ; P. O'Connor ; Patrick Hilger
Choice of solar share of a hybrid power plant of a central receiver system and a biogas plant in dependency of the geographical latitude (2011)
Spiros Alexopoulos ; Bernhard Hoffschmidt ; Christoph Rau ; Johannes Sattler
Modelling and validation of a transient heat recovery steam generator of the solar tower power plant Juelich (2012)
Spiros Alexopoulos ; Christoph Rau ; Bernhard Hoffschmidt ; Gerd Breitbach ; Markus Latzke
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