Figure shows in cross section a wall consisting of four layers with thermal conductivities K 1 = 0.06 W/mK; K 3 = 0.04 W/mK and K 4 = 0.10 W/mK. The layer thicknesses are L 1 = 1.5 cm; L 3 = 2.8 cm and L 4 = 3.5 cm. The temperature of interfaces is as shown in figure. Energy transfer through the wall is steady.
(i) The temperature of the interface between layers 3 and 4 is:
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(i) In steady state 
⇒ 
= 
⇒ Δ T =7°C
T 3 = (– 10 + 7)°C = – 3°C
(ii) 
⇒ 
= 
⇒ Δ T = 14°C
T 3 = (– 3 + 14)°C = 11°C
(iii) 
⇒ 
= 
⇒ K 2 = 0.02 W/mK
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