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Solar Thermal Energy Utilization: German Studies on Technology and Application
Paperback
Technology & EngineeringEnvironmental Studies
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ISBN10: 3540532692
ISBN13: 9783540532699
Publisher: Springer
Published: Mar 20 1991
Pages: 528
Weight: 1.65
Height: 1.09 Width: 6.14 Depth: 9.21
Language: English
ISBN13: 9783540532699
Publisher: Springer
Published: Mar 20 1991
Pages: 528
Weight: 1.65
Height: 1.09 Width: 6.14 Depth: 9.21
Language: English
Sie beinhaltet zum einen die Fortsetzung und abschlie ende Bewertung der Materialuntersuchungen zum Bau eines Sckundärkonzentrators (feil I Vertragsnr. 5-370-4355), zum anderen werden der Bau mehrerer Vormodelle zu den mög- lichen Konzentratorformen und Me ergebnisse zu diesen Modellen vorgestellt, wo- bei unter Berücksichtigung der aufwendigen Fertigung der harten Spiegelbasis- materialien zur Kostenersparnis Iinearisierte Formen untersucht wurden, mit und ohne Teilbereich mit keramikähnlichen optischen Eigenschaften (Glanzkarton). Polierte Keramik in unbeschiehteter Form ist nur bedingt einsetzbar, da sie bei nahezu senkrechtem Strahlungseinfall einen direkten Reflexionsgrad von ca 9% zeigt (A1 TiO ). Die 27T-Reflexion dagegen kann für wei e, reine Keramik über 90% 2 s liegen (Hartporzellan). Erst durch Beschichtungen lassen sich die Werte für die direkte Reflexion deutlich erhöhen, wobei die Oberflächenbeschaffenheit eine we- sentliche Rolle spielt. Eine Beschichtung von TiN auf Glas erzielt Werte über 90%, jedoch ist diese Schicht nicht über das gesamte Sonnenspektrum einsetzbar. Au erdem ist die Schicht oxidationsgefährdet, eine zusätzliche Goldschicht wäre möglicherweise ein Schutz dagegen. Bei den Modellen ( CPC, Trumpet ) wurde die Intensitätsverteilung in einigen Schnitten in der Austrittsapcrtur aufgenommen, zum Teil bei unterschiedlichen Einfallswinkeln. Daraus wurde die Verstärkung innerhalb der Schnitte und der Flu im Vergleich zum Zustand ohne Konzcntrator ermittelt. Durch den Einsatz einc.
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