LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

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3/14/2003 Transfer global de căldură la potenţial termic constant o Din (217), fluxul termic unitar: q = ΔT n ∑ i= 1 R i = ∑ j= 1 j 2 o Fluxul termic va fi dat de expresia: Q s = 1 α 1 + 1 δ 1 α 1 m 1 ∑ j + λ α j= 1 j 2 + ⋅ T 1 m A − ⋅ δ λ T j 2 + LUCIAN GAVRILĂ – Fenomene de transfer II 16 1 α (218) ( T − T ) = K ⋅ A⋅ ΔT 1 2 (219)
3/14/2003 Transfer global de căldură la potenţial termic constant oÎn ecuaţiile (218) – (219) s-a considerat că transferul termic între fluide decurge printr-un perete plan compus din m straturi având grosimi şi conductivităţi termice distincte. o Pentru transferul termic între 2 fluide separate prin pereţi plani, coeficientul global de transfer de căldură are expresia: K = 1 α 1 + 1 δ m 1 ∑ j + λ α j= 1 j 2 ⎡ ⎢ ⎣ m W LUCIAN GAVRILĂ – Fenomene de transfer II 17 2 ⋅ K ⎤ ⎥ ⎦ (220)
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3/14/2003 VALORI ORIENTATIVE ALE CO
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Analiza coeficientului global de 3/
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LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

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