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Melhoria da transferência de calor no tubo de fluxo do coletor solar parabólico
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ISBN10: 620939986X
ISBN13: 9786209399862
Publisher: Edicoes Nosso Conhecimento
Published: Dec 5 2025
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786209399862
Publisher: Edicoes Nosso Conhecimento
Published: Dec 5 2025
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Portuguese
O objetivo deste trabalho é apresentar um novo estudo térmico do tubo circular absorvedor/recetor do sistema de colectores solares de calha parabólica para escoamento laminar e turbulento (modelo k-ɛ) de fluidos. Usando o software CFD ANSYS FLUENT, uma simulação numérica bidimensional é realizada no fluxo aprimorado e fluido de transferência de calor do ar no tubo recetor PTC. Em ambos os regimes de fluxo laminar e turbulento, os resultados mostraram melhorias significativas na transferência de calor, velocidade e queda de temperatura também, o padrão de distribuição de temperatura sobre o absorvedor de tubo é exibido e vectores de velocidade, contornos de pressão, contornos de temperatura são analisados. A queda de velocidade aumenta e a queda de pressão diminui com o aumento da distância ao longo do eixo da linha central em direção à linha de saÃda do tubo recetor. É apresentado o efeito do aumento do fluxo de calor para a parede do tubo, que provoca o aumento da temperatura da parede (de 350 para 390 K em escoamento laminar e de 310 para 325 K em escoamento turbulento). Adicionalmente, foram calculados os números Nu, Fr e Cd para a transferência de calor em escoamento laminar e turbulento. O fator de desempenho térmico do PTC foi estimado, tendo sido encontrado 74% em condições de escoamento laminar.
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