An evaporator is insulated using glass wool material of $0.15 \mathrm{~m}$ thickness. The inner most surface and the outer surface of the insulation are at $700{ }^{\circ} \mathrm{C}$ and $80^{\circ} \mathrm{C}$, respectively. The mean thermal conductivity of the glass wool under these conditions is $0.29 \mathrm{~W} . \mathrm{m}^{-1} . \mathrm{K}^{-1}$. The rate of heat loss (in $W$ ) through $1.2 \mathrm{~m}^2$ of the evaporator wall surface (rounded off to the nearest integer) is ______________.
