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| author | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
|---|---|---|
| committer | prashantsinalkar | 2017-10-10 12:27:19 +0530 |
| commit | 7f60ea012dd2524dae921a2a35adbf7ef21f2bb6 (patch) | |
| tree | dbb9e3ddb5fc829e7c5c7e6be99b2c4ba356132c /534/CH12/EX12.9/12_9_Brick_Wall.sce | |
| parent | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (diff) | |
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initial commit / add all books
Diffstat (limited to '534/CH12/EX12.9/12_9_Brick_Wall.sce')
| -rw-r--r-- | 534/CH12/EX12.9/12_9_Brick_Wall.sce | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/534/CH12/EX12.9/12_9_Brick_Wall.sce b/534/CH12/EX12.9/12_9_Brick_Wall.sce new file mode 100644 index 000000000..55c598a70 --- /dev/null +++ b/534/CH12/EX12.9/12_9_Brick_Wall.sce @@ -0,0 +1,35 @@ +clear;
+clc;
+printf('FUNDAMENTALS OF HEAT AND MASS TRANSFER \n Incropera / Dewitt / Bergman / Lavine \n EXAMPLE 12.9 Page 766 \n')// Example 12.9
+
+// Total hemispherical emissivity of fire brick wall
+// Total emissive power of brick wall
+// Absorptivity of the wall to irradiation from coals
+
+Ts = 500 ;//[K] temperature of brick surface
+Tc = 2000 ;//[K] Temperature of coal exposed
+stfncnstt = 5.67*10^-8; //[W/m^2.K^4] Stefan-Boltzmann constant
+// From the given graph of emissivities
+e1 = .1; //between wavelength 0 micro-m- 1.5 micro-m
+e2 = .5; //between wavelength 1.5 micro-m- 10 micro-m
+e3 = .8; //greater than wavelength 10 micro-m
+
+//From Table 12.1
+//For wl1 = 1.5 micro-m and T = 500 K, At wl1*T = 750 micro-m.K
+F0wl1 = 0;
+//For wl2 = 10 micro-m and T = 500 K, At wl2*T = 5000 micro-m.K
+F0wl2 = .634;
+//From equation 12.36
+e = e1*F0wl1 + e2*F0wl2 + e3*(1-F0wl1-F0wl2);
+
+//Equation 12.26 and 12.35
+E = e*stfncnstt*Ts^4;
+
+//From Table 12.1
+//For wl1 = 1.5 micro-m and T = 2000 K, At wl1*T = 3000 micro-m.K
+F0wl1c = 0.273;
+//For wl2 = 10 micro-m and T = 2000 K, At wl2*T = 20000 micro-m.K
+F0wl2c = .986;
+ac = e1*F0wl1c + e2*[F0wl2c-F0wl1c] + e3*(1-F0wl2c);
+
+printf('\n Total hemispherical emissivity of fire brick wall = %.3f \n Total emissive power of brick wall = %i W/m^2.\n Absorptivity of the wall to irradiation from coals = %.3f',e,E,ac);
\ No newline at end of file |