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diff --git a/1073/CH2/EX2.15/2_15.sce b/1073/CH2/EX2.15/2_15.sce
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+//Example 2.15
+printf("Example 2.15 \n")
+A=1  // [sq m]
+  x1=0.1    //m
+  x2=0.04
+  k1=0.7
+  k2=0.48
+  sigma=x1/(k1*A)+x2/(k2*A)   //K/W
+  //Q=4.42*dT
+  //Q=dT/sigma
+  //with rockwool insulation added,Q_dash=0.75*Q
+ k3=0.065     // W/(m.K)
+  //Q_dash=dT/sigma+x3/k3*A
+  //On solving Q and Q_dash we get
+  x3=((1/(0.75*4.42))-sigma)*k3    //[m]
+  x3=x3*1000     // [mm]
+  printf("Thickness of rockwool insulation required=%f mm",x3)
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