Thermodynamics HW Solutions 611

Thermodynamics HW Solutions 611 - R_conv_i=1(h_i*A_i...

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Chapter 7 External Forced Convection 7-84 "!PROBLEM 7-84" "GIVEN" T_i=110 "[C]" T_o=22 "[C]" k_pipe=52 "[W/m-C]" r_1=0.02 "[m]" t_pipe=0.003 "[m]" "T_s_max=30 [C], parameter to be varied" h_i=80 "[W/m^2-C]" h_o=22 "[W/m^2-C]" k_ins=0.038 "[W/m-C]" "ANALYSIS" L=1 "[m], 1 m long section of the pipe is considered" A_i=2*pi*r_1*L A_o=2*pi*r_3*L r_3=r_2+t_ins*Convert(cm, m) "t_ins is in cm" r_2=r_1+t_pipe
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Unformatted text preview: R_conv_i=1/(h_i*A_i) R_pipe=ln(r_2/r_1)/(2*pi*k_pipe*L) R_ins=ln(r_3/r_2)/(2*pi*k_ins*L) R_conv_o=1/(h_o*A_o) R_total=R_conv_i+R_pipe+R_ins+R_conv_o Q_dot=(T_i-T_o)/R_total Q_dot=(T_s_max-T_o)/R_conv_o T s, max [C] t ins [cm] 24 4.45 26 2.489 28 1.733 30 1.319 32 1.055 34 0.871 36 0.7342 38 0.6285 40 0.5441 42 0.4751 44 0.4176 46 0.3688 48 0.327 7-66...
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