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+clear;

+clc;

+

+// A Textbook on HEAT TRANSFER by S P SUKHATME

+// Chapter 3

+// Thermal Radiation

+

+// Example 3.5

+// Page 124

+printf("Example 3.5, Page 124 \n\n")

+

+l1 = 0.5 ; // wavelength, [um]

+l2 = 1.5 ; // wavelength, [um]

+l3 = 2.5 ; // wavelength, [um]

+l4 = 3.5 ; // wavelength, [um]

+H1 = 2500 ; // [W/m^2 um]

+H2 = 4000 ; // [W/m^2 um]

+H3 = 2500 ; // [W/m^2 um]

+

+// Since the irridiation is diffuse, the spectral intensity is given by eqn 3.4.14 and 3.4.8

+// Integrating i_lambda over the directions of the specified solid angle and using fig 3.12

+

+

+flux = 3/4*[H1*(l2-l1)+H2*(l3-l2)+H3*(l4-l3)];

+printf("Rate at which radiation is incident on the surface = %f W/m^2",flux);