Two plates A and B, 10 cm thick, w1 = 0.6m wide and very long (-> infinit). they are embedded between two blocks of thermally insulating material as shown in figure 2. The conductivity of plate A (ka) is unknown, but it is known that kb = 0.40 W / (m.K). Heat is generated in plate A material (phi = / = 0). while plate B only conducts heat. There is a duct of height w2 = 0.3m code on the À plate. There is air. In this scenario, the following temperatures are observed in a stationary regime:
The temperature of the upper surface of plate A: T1 = 450k
The temperature of the upper surfaces of the duct (sup 2) and
Air temperature inside 1, T2 = T air = 300k
Interface temperature between Plate A and plate B (resistance
negligible contact) T0 = 500k,
Plate B bottom surface temperature T4 = 450K
a) In the duct, the air exchanges heat by convection with plate A with an h = 5 W / (m ^ 2.K). Knowing
that you can consider all surfaces as opaque, gray, and diffuse, and that E1 = 0.8 and E2 = 0.4, calculate the heat q 'up (W / m) lost by that face (sup. 1).