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+clc;
+clear all;
+disp("heat flow rate")
+La=0.03;//m
+Aa=0.1*0.1;//m^2
+kA= 150;//W/(m*C)
+RthA=La/(kA*Aa);
+Lb=0.08;//m
+Ab=0.1*0.03;//m^2
+kB= 30;//W/(m*C)
+RthB=Lb/(kB*Ab);
+Lc=0.08;//m
+Ac=0.1*0.07;//m^2
+kC= 65;//W/(m*C)
+RthC=Lc/(kC*Ac);
+Ld=0.05;//m
+Ad=0.1*0.1;//m^2
+kD= 50;//W/(m*C)
+RthD=Ld/(kD*Ad);
+Req=RthB*RthC/(RthB+RthC);
+Rtotal=RthA+Req+RthD
+t1=400;// degree C
+t2=60;// degree C
+Q=(t1-t2)/Rtotal;
+disp ("W",Q,"heat transfer = ")
+