Awall is built of two metals (stainless steel and lead) that are in thermal contact with each other. if the temperature difference across the steel plate is 17.79 k and the plates are 1.471 cm (steel) and 2.416 cm (lead) thick, what is the temperature difference across the entire wall? k

entire wall temperature difference = 29.29 K

Explanation:

given data

temperature difference steel ΔT = 17.79 K

steel L = 1.471 cm

lead L = 2.416 cm

to find out

temperature difference across wall

solution

we know that here heat transfer by steel and lead are same

and

heat transfer = k×A×ΔT /  L   1

so

H( lead) = H (steel)

k×A×ΔT /  L   =    k×A×ΔT /  L     2

here we know

k for steel = 14.4 W/mK

k for lead = 36.6 W/mK

so put here all value in equation  2

k×ΔT /  L   =    k×ΔT /  L

36.6×ΔT /  2.416   =    14.4×17.79 /  1.471

ΔT = 11.50 K

so

entire wall temperature difference = 11.50 + 17.79

entire wall temperature difference = 29.29 K

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