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Thermodynamics HW Solutions 286

# Thermodynamics HW Solutions 286 -...

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Chapter 3 Steady Heat Conduction 3-175 "!PROBLEM 3-175" "GIVEN" A_surface=0.15*0.20 "[m^2]" T_b=85 "[C]" k=237 "[W/m-C]" side=0.002 "[m]" L=0.04 "[m]" T_infinity=25 "[C]" h=20 "[W/m^2-C]" "epsilon_fin=3 parameter to be varied" "ANALYSIS" A_c=side^2 p=4*side a=sqrt((h*p)/(k*A_c)) eta_fin=tanh(a*L)/(a*L) A_fin=n_fin*4*side*L A_unfinned=A_surface-n_fin*side^2 Q_dot_finned=eta_fin*h*A_fin*(T_b-T_infinity)
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Unformatted text preview: Q_dot_unfinned=h*A_unfinned*(T_b-T_infinity) Q_dot_total_fin=Q_dot_finned+Q_dot_unfinned Q_dot_nofin=h*A_surface*(T_b-T_infinity) epsilon_fin=Q_dot_total_fin/Q_dot_nofin ε fin n fin 1.5 51.72 1.75 77.59 2 103.4 2.25 129.3 2.5 155.2 2.75 181 3 206.9 3.25 232.8 3.5 258.6 3.75 284.5 4 310.3 4.25 336.2 4.5 362.1 4.75 387.9 5 413.8 3-129...
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