Consider a composite wall of overall height H = 30 mm and thickness L = 40 mm. Section A has thickness LA = 15 mm and thermal conductivity of 3 W/(m·K). Sections B and C each have height HB = 15 mm and thickness LB = 25 mm. The thermal conductivity is 1 W/(m·K) in section B and 2 W/(m·K) in section C. The temperatures of the left and right faces of the composite wall are T1 = 60°C and T2 = 30°C, respectively. The top and bottom of the wall are insulated. A) Draw a thermal circuit based on heat flux for the composite wall shown above. Assume that the temperature is uniform “vertically” in material A. Indicate the temperatures, thermal resistances, and heat flux in the circuit diagram. Show the equations for the thermal resistances in the circuits. Do NOT need to perform any calculations in this part. B. Draw a thermal circuit based on heat flux for the composite wall shown above. Assume that the temperature is NOT uniform “vertically” in material A and heat only flows along horizontal direction. Indicate the temperatures, thermal resistances, and heat flux in the circuit diagram. Show the equations for the thermal resistances in the circuits. Do NOT need to perform any calculations in this part. C. Determine the heat flux that enters material A using the two circuits that you have drawn in parts A and B
Consider a composite wall of overall height H = 30 mm and thickness L = 40 mm. Section A has
thickness LA = 15 mm and thermal conductivity of 3 W/(m·K). Sections B and C each have height
HB = 15 mm and thickness LB = 25 mm. The thermal conductivity is 1 W/(m·K) in section B and 2
W/(m·K) in section C. The temperatures of the left and right faces of the composite wall are T1 =
60°C and T2 = 30°C, respectively. The top and bottom of the wall are insulated.
A) Draw a thermal circuit based on heat flux for the composite wall shown above.
Assume that the temperature is uniform “vertically” in material A. Indicate the
temperatures, thermal resistances, and heat flux in the circuit diagram. Show the
equations for the thermal resistances in the circuits. Do NOT need to perform any
calculations in this part.
B. Draw a thermal circuit based on heat flux for the composite wall shown above.
Assume that the temperature is NOT uniform “vertically” in material A and heat only
flows along horizontal direction. Indicate the temperatures, thermal resistances, and
heat flux in the circuit diagram. Show the equations for the thermal resistances in the
circuits. Do NOT need to perform any calculations in this part.
C. Determine the heat flux that enters material A using the two circuits that you
have drawn in parts A and B
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