Figure shows the cross n of a wall made of three layers The thicknesses of the layers are L 1 , L 2 0 700 L 1 and L 2 0 350L 1 The thermal conductivities are k 1 , k 2 0 900k 1 , and k 3 0 800k 1 The temperatures at the left and right sides of the wall are T H 30 0 o C and TC 15 0 o C, respectively...

a As in Sample Problem 186 we take the rate of conductive heat transfer through each layer t ...

Figure shows the cross n of a wall made of three layers. The thicknesses of the layers

Question:

Figure shows the cross n of a wall made of three layers. The thicknesses of the layers are L₁, L₂= 0.700 L₁and L₂= 0.350L₁. The thermal conductivities are k₁, k₂= 0.900k₁, and k₃= 0.800k₁. The temperatures at the left and right sides of the wall are T_H= 30.0^oC and TC = €“15.0^oC, respectively. Thermal conduction is steady.

(a) What is the temperature difference Î”T₂ across layer 2 (between the left and right sides of the layer)? If k₂ were, instead, equal to l.Ik₁,

(b) Would the rate at which energy is conducted through the wall be greater than, less than, or the same as previously, and

ks ko ky TC TH L3 L1