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+// Display mode

+mode(0);

+// Display warning for floating point exception

+ieee(1);

+clear;

+clc;

+disp("Engineering Thermodynamics by Onkar Singh Chapter 12 Example 12")

+T1=(-150+273);//temperature of air inside in K

+T2=(35+273);//temperature of outer surface in K

+epsilon1=0.03;//emissivity

+epsilon2=epsilon1;

+D1=25*10^-2;//diameter of inner sphere in m

+D2=30*10^-2;//diameter of outer sphere in m

+sigma=2.04*10^-4;//stephen boltzmann constant in KJ/m^2 hr K^4

+disp("heat transfer through concentric sphere,Q in KJ/hr ")

+disp("Q=(A1*sigma*(T1^4-T2^4))/((1/epsilon1)+((A1/A2)*((1/epsilon2)-1)))")

+A1=4*%pi*D1^2/4;

+A2=4*%pi*D2^2/4;

+Q=(A1*sigma*(T1^4-T2^4))/((1/epsilon1)+((A1/A2)*((1/epsilon2)-1)))

+disp("so heat exchange=6297.1 KJ/hr")