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Diffstat (limited to '2510/CH19/EX19.1/Ex19_1.sce')
| -rwxr-xr-x | 2510/CH19/EX19.1/Ex19_1.sce | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/2510/CH19/EX19.1/Ex19_1.sce b/2510/CH19/EX19.1/Ex19_1.sce new file mode 100755 index 000000000..5fddaac8c --- /dev/null +++ b/2510/CH19/EX19.1/Ex19_1.sce @@ -0,0 +1,23 @@ +//Variable declaration: +H = 2.5 //Height of wall (m) +W = 4 //Width of wall (m) +h = 11 //Convective heat transfer coefficient (W/m^2.K) +T1 = 24 //Outside surface temperature ( C) +T3 = -15 //Outside air temperature ( C) +L = 7.62/10**3 //Insulation thickness (m) +k = 0.04 //Thermal conductivity of wool (W/m.K) + +//Calculation: +A = H*W //Heat transfer area (m^2) +Q = h*A*(T1-T3) //Heat transfer rate (W) +Ri = L/(k*A) //Insuation resistance (K/W) +Rc = 1/(h*A) //Convective resitance (K/W) +R = Ri+Rc //Total resistance (K/W) +Qt = (T1-T3)/R //Revised heat transfer rate (Btu/h) + +//Result: +printf("1. The heat transfer rate without insulation is : %.0f W .",Q) +printf("Or, the heat transfer rate without insulation is : %.0f Btu/h .",Q*3.412) +printf("2. The revised heat transfer rate with insulation is : %.0f W .",Qt) +printf("Or, the revised heat transfer rate with insulation is : %.0f Btu/h .",Qt*3.412) +printf("There is a calculation mistake in book.") |