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Diffstat (limited to '2510/CH17/EX17.10')
-rwxr-xr-x | 2510/CH17/EX17.10/Ex17_10.sce | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/2510/CH17/EX17.10/Ex17_10.sce b/2510/CH17/EX17.10/Ex17_10.sce new file mode 100755 index 000000000..6743c6203 --- /dev/null +++ b/2510/CH17/EX17.10/Ex17_10.sce @@ -0,0 +1,38 @@ +//Variable declaration: +Do = 2.5/100 //Outside diameter of tube (m) +t = 1/10**3 //Thickness of fin (m) +T = 25 //Fluid temperature ( C) +Tb = 170 //Surface temperature ( C) +h = 130 //Heat transfer coefficient (W/m^2.K) +k = 200 //Thermal conductivity of fin (W/m.K) +rf = 2.75/100 //Outside radius of fin (m) + +//Calculation: +ro = Do/2 //Radius of tube (m) +Ab = 2*%pi*ro*t //Area of the base of the fin (m^2) +Te = Tb-T //Excess temperature at the base of the fin (K) +Q1 = h*Ab*Te //Total heat transfer rate without the fin (W) +Bi = h*(t/2)/k //Biot number +L = rf-ro //Fin height (m) +rc = rf+t/2 //Corrected radius (m) +Lc = L+t/2 //Corrected height (m) +Ap = Lc*t //Profile area (m^2) +Af = 2*%pi*(rc**2-ro**2) //Fin surface area (m^2) +Qm = h*Af*Te //Maximum fin heat transfer rate (W) +A = sqrt(Lc**3*h/(k*Ap)) //Abscissa of fin efficiency +C = rf/ro //Curve parameter of fin efficiency +//From figure 17.4: +nf = 0.86 //Fin efficiency +Qf = nf*Qm //Fin heat transfer rate (W) +R = Te/Qf //Fin resistance (K/W) + +//Result: +printf("1. The heat transfer rate without the fin is : %.2f W .",Q1) +printf("Or, the heat transfer rate without the fin is : %.0f Btu/h .",Q1*3.412) +printf("2. The corrected length is : %.4f m .",Lc) +printf("3. The outer radius is : %.3f m ",rc) +printf("4. The maximum heat transfer rate from the fin is : %.2f W .",Qm) +printf("5. The fin efficiency is : %.0f %%",nf*100) +printf("6. The fin heat transfer rate is : %.0f %%",Qf) +printf("Or, the fin heat transfer rate is : %.0f %%",Qf*3.412) +printf("7. The fin thermal resistance is : %.2f K/W .",R) |