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Verbesserung der Wärmeübertragung im Strömungsrohr eines Parabolrinnenkollektors
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ISBN10: 6209300030
ISBN13: 9786209300035
Publisher: Verlag Unser Wissen
Published: Dec 5 2025
Pages: 68
Weight: 0.23
Height: 0.16 Width: 6.00 Depth: 9.00
Language: German
ISBN13: 9786209300035
Publisher: Verlag Unser Wissen
Published: Dec 5 2025
Pages: 68
Weight: 0.23
Height: 0.16 Width: 6.00 Depth: 9.00
Language: German
Ziel dieser Arbeit ist es, eine neuartige thermische Studie des kreisförmigen Absorber-/Empfängerrohrs eines Parabolrinnen-Solarkollektorsystems für laminare und turbulente (k-ɛ-Modell) Flüssigkeitsströmungen zu präsentieren. Mit Hilfe der CFD-Software ANSYS FLUENT wird eine zweidimensionale numerische Simulation der verbesserten Strömung und der Wärmeübertragung von Luft im PTC-Receiverrohr durchgeführt. Sowohl in der laminaren als auch in der turbulenten Strömung zeigen die Ergebnisse signifikante Verbesserungen bei der Wärmeübertragung, der Geschwindigkeit und dem Temperaturabfall. Au erdem wird das Muster der Temperaturverteilung über dem Rohrabsorber dargestellt und Geschwindigkeitsvektoren, Druck- und Temperaturkonturen werden analysiert. Der Geschwindigkeitsabfall steigt und der Druckabfall sinkt mit zunehmendem Abstand entlang der Mittellinie zum Auslass des Sammelrohrs. Die Auswirkung eines zunehmenden Wärmestroms in Richtung Rohrwand wird dargestellt; sie führt zu einem Anstieg der Wandtemperatur (von 350 auf 390 K bei laminarer Strömung und von 310 auf 325 K bei turbulenter Strömung). Au erdem wurden Nu-Zahl, Fr und Cd für den Wärmeübergang bei laminarer und turbulenter Strömung berechnet. Der thermische Leistungsfaktor des PTC wird geschätzt und beträgt 74 % bei laminarer Strömung.
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