Assuming negligible contact resistance between the wall surfaces, the interface temp T(C) of the two walls will be

Question

Consider the steady state heat conduction across the thickness in a plane composite wall as shown in fig exposed to convection condition on both sides

Given h_i = 20 W/m²K; h₀ =50 W/m²k;

 

$T_{\infty ,i}$ = 20⁰C, $T_{\infty ,0}$ = –2⁰C; K₁ = 20 W/mK;

K₂ = 50W/mK; L₁ = 0.3m; L₂ = 0.15m;

Assuming negligible contact resistance between the wall surfaces, the interface temp T(C) of the two walls will be                    

      (a) –0.50                                                             (b) 2.75

      (c) 3.75                                                               (d) 4.5