Determine the conduction heat flux through various plane layers that are subjected to boundary temperatures of T_s,1 = 301 K and T_s,2 = 299 K at atmospheric pressure.

(a) Case A: The plane layer is aluminum. Determine the heat flux q"_x for L_tot = 600 μm and L_tot = 600 nm.

(b) Case B: Conduction occurs through an air layer. Determine the heat flux q"_x for L_tot = 600 μm and L_tot = 600 nm.

(c) Case C: The composite wall is composed of air held between two aluminum sheets. Determine the heat flux q"_x for L_tot = 600 μm (with aluminum sheet thicknesses of δ = 40 μm) and L_tot  = 600 nm (with aluminum sheet thicknesses of δ = 40  nm).

(d) Case D: The composite wall is composed of 7 air layers interspersed between 8 aluminum sheets. Determine the heat flux q"_x for L_tot  = 600 μm (with aluminum sheet and air layer thicknesses of  δ = 40  μm) and L_tot = 600 nm (with aluminum sheet and air layer thicknesses of δ = 40 nm).

Transcribed Image Text:

T₁,1 T1 4.1 Lx Aluminum Los Case A Air - Aluminum Case C 1 Lot 8 Lot T₁,1 T₁,2 T₁,1 T₁,2 Lox Air Case B Air Aluminum Case D 1 Lot Lot T₁,2 8 T. 3,2