LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

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3/14/2003 Variaţia temperaturilor numai în timp o Eliminând pe dQ între ec. (238) şi (240): d o Integrând ecuaţia (241) între momentul iniţial (t = 0) şi un moment oarecare t, se obţine: ( T − T ) T 1 1 − T 2 2 = − f ⋅ K ⋅ A dt LUCIAN GAVRILĂ – Fenomene de transfer II 52 ⋅ (241)
3/14/2003 Variaţia temperaturilor T −T T i −T i 1 1 ln ln ∫ ΔT 2 2 T T 1 1i d ΔT ΔT = i numai în timp ( T − T ) T − − 1 T T = 1 ΔT − 2 2i i − ⋅ T f 2 = 2 ⋅ − exp f K = ⋅ ⋅ − K A f ⋅ ⋅ t ⋅ K A ( − f ⋅ K ⋅ A⋅ t) ⋅ LUCIAN GAVRILĂ – Fenomene de transfer II 53 ⋅ t A t ∫ 0 dt (242)
Page 1 and 2: 3/14/2003 TRANSFERUL GLOBAL DE CĂL
Page 3 and 4: 1 1 - transfer convectiv prin filmu
Page 5 and 6: 3/14/2003 TRANSFER TERMIC GLOBAL o
Page 7 and 8: 3/14/2003 TRANSFER TERMIC GLOBAL oL
Page 9 and 10: 3/14/2003 Transfer global de căldu
Page 23 and 24: T T 1 T 2 3/14/2003 Transfer global
Page 27 and 28: T 1i T 1i T 2i 3/14/2003 T 2i ΔT T
Page 29 and 30: T 1 3/14/2003 T 2i a) T 2f H = H H
Page 35 and 36: osau: 3/14/2003 Transfer global de
Page 47 and 48: 3/14/2003 Transfer termic la poten
Page 49 and 50: 3/14/2003 1 2 T 1i T 2i Fluidul 1 t
Page 51: 3/14/2003 Variaţia temperaturilor
Page 55 and 56: ose obţine: 3/14/2003 Variaţia te
Page 57 and 58: 3/14/2003 Variaţia temperaturilor
Page 73 and 74: 3/14/2003 Transfer termic direct f
Page 79 and 80: 3/14/2003 Transfer termic direct cu
Page 89 and 90: Re g 3/14/2003 Transfer global de c
Page 95 and 96: 3/14/2003 VALORI ORIENTATIVE ALE CO
Page 97 and 98: Analiza coeficientului global de 3/
Page 99 and 100: Analiza coeficientului global de 3/
Page 101: Analiza coeficientului global de 3/

LUCIAN GAVRILĂ – Fenomene de transfer II - Cadre Didactice

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