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Poprawa wymiany ciepla w rurze przeplywowej parabolicznego kolektora slonecznego
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ISBN10: 6209310273
ISBN13: 9786209310270
Publisher: Wydawnictwo Nasza Wiedza
Published: Dec 5 2025
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Polish
ISBN13: 9786209310270
Publisher: Wydawnictwo Nasza Wiedza
Published: Dec 5 2025
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Polish
Celem niniejszej pracy jest przedstawienie nowatorskiego badania termicznego okrąglej rury absorbera/odbiornika parabolicznego systemu kolektorów slonecznych dla laminarnego i turbulentnego (model k-ɛ) przeplywu plynów. Korzystając z oprogramowania CFD ANSYS FLUENT, przeprowadzono dwuwymiarową symulację numeryczną zwiększonego przeplywu i wymiany ciepla powietrza w rurze odbiorczej PTC. Zarówno w przypadku przeplywu laminarnego, jak i turbulentnego, wyniki wykazaly znaczną poprawę wymiany ciepla, prędkości i spadku temperatury, a także przedstawiono wzór rozkladu temperatury na absorberze rurowym oraz przeanalizowano wektory prędkości, kontury ciśnienia i kontury temperatury. Spadek prędkości wzrasta, a spadek ciśnienia maleje wraz ze wzrostem odleglości wzdluż osi linii środkowej w kierunku linii wylotowej rury odbiornika. Przedstawiono efekt zwiększania strumienia ciepla w kierunku ścianki rury; powoduje to wzrost temperatury ścianki (z 350 do 390 K w przeplywie laminarnym i z 310 do 325 K w przeplywie turbulentnym). Dodatkowo obliczono liczbę Nu, Fr i Cd dla wymiany ciepla w przeplywie laminarnym i turbulentnym. Oszacowano wspólczynnik wydajności cieplnej PTC i stwierdzono, że wynosi on 74% w warunkach przeplywu laminarnego.
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