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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /551/CH15/EX15.13/13.sce | |
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initial commit / add all books
Diffstat (limited to '551/CH15/EX15.13/13.sce')
| -rwxr-xr-x | 551/CH15/EX15.13/13.sce | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/551/CH15/EX15.13/13.sce b/551/CH15/EX15.13/13.sce new file mode 100755 index 000000000..223f3a617 --- /dev/null +++ b/551/CH15/EX15.13/13.sce @@ -0,0 +1,27 @@ +clc
+r1=0.001; //m
+r2=0.0018; //m
+k=0.12; //W/m 0C
+h0=35; //W/m^2 0C
+
+rc=k/h0;
+
+thickness=(rc-r1)*10^3; //mm
+disp("Critical thickness of insulation =")
+disp(thickness)
+disp("mm")
+
+//Percentage change in heat transfer rate :
+//Case I : The heat flow through an insulated wire
+
+//Q1=2*%pi*L*(t1-tair)/(log(r2/r1)/k + 1/h0/r2)
+
+//Case II : The heat flow through an insulated wire when critical thickness is used is given
+
+//Q2=2*%pi*L*(t1-tair)/(log(rc/r1)/k + 1/h0/rc)
+
+//%increase=(Q2-Q1)/Q1*100
+%increase=(1/(log(rc/r1)/k + 1/h0/rc)-1/(log(r2/r1)/k + 1/h0/r2))/(1/(log(r2/r1)/k + 1/h0/r2))*100;
+disp("Percentage change in heat transfer rate =")
+disp(%increase)
+disp("%")
\ No newline at end of file |