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+clc;
+clear all;
+disp("temperature between layers")
+La=0.22;//m
+Lb=0.15;//m
+Lc=0.05;//m
+Ld=0.003;//m
+kA=4;// kJ/(mh*C)
+kB=2.8;// kJ/(mh*C)
+kC=0.24;// kJ/(mh*C)
+kD=240;// kJ/(mh*C)
+t1= 1500;// degree C
+t5=90;// degree C
+RthA=La/kA;//(m^2)*h*C/kJ
+RthB=Lb/kB;// (m^2)*h*C/kJ
+RthC=Lc/kC;// (m^2)*h*C/kJ
+RthD=Ld/kD;// (m^2)*h*C/kJ
+Rtotal= RthA+RthB+RthC+RthD;// (m^2)*h*C/kJ
+disp ("(m^2)*h*C/kJ",Rtotal,"total thermal resistance is = ")
+q= (t1-t5)/Rtotal;// kJ/(h*m^2)
+disp("kJ/(h*m^2)",q,"rate of heat loss per unit area of the wall is =")
+// q= (t1-t2)/RthA= (t3-t4)/RthB
+t4=t5+q*RthD;// degree C
+disp ("degree C",t4,"the temperature t4 is = ")
+t3=t4+q*RthC;// degree C
+disp ("degree C",t3,"the temperature t3 is = ")
+t2=t3+q*RthB;// degree C
+disp ("degree C",t2,"the temperature t2 is = ")