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+clc;
+clear all;
+disp("Thickness of insulation")
+delT=1150-40;// degree C
+kA=1.52 ;//W/(m*C)
+kB= 0.138;//W/(m*C)
+kC=45;// W/(m*C)
+kD= 0.138;//W/(m*C)
+q= 400;//W/m^2
+// q = Q/A = delT/(La/kA+Lb/kB+Lc/kC+Ld/kD)
+//400 = 1110/(0.2/1.52+x/0.138+0.006/45+0.1/0.138)
+//0.8563+7.2*x = 1110/400=2.775
+x=(2.775-0.8563)/7.2
+disp ("mm",x*1000,"thickness of insulation brick is= ")
+//q=400=(tSO-40)/(Ld/kD)
+//400=(tSO-40)/(0.1/0.138)
+tSO=400/1.38+40;// degree C
+disp ("degree C",tSO,"temperature of outer surface of steel plate is = ")