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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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