Question

You want to limit the heat flux density (heat intensity) by a wall to 10 W / (m2). The outside temperature is 4 ° C and the internal temperature 37 ◦C.
How thick should a steel wall (λ = 17, 3 W / (m · K)) be to meet requirements?
How thick must a mineral wool disk (λ = 0, 038 W / (m · K) be) to give the same greatest heat intensity?
Disregard the heat transfer rates between the wall materials and air.

An oven wall inside is made of refractory bricks (150 mm thick), a steel plate (12 mm thick) and extremely ordinary brick (150 mm thick). The temperature on the inner wall is 700 ° C and on the outer wall 150 ° C. Calculate the heat flux per square meter (ie the heat intensity) by the composite wall!
Calculate the temperature at the interface between the different materials!
Thermal Conduits: Steel 17.3 W / (m · K), Refractory Brick 1.7 W / (m · K) and ordinary brick 5.3 W / (m · K).

Answer 1

still any doubts feel free to ask at least before giving downvote hope you understand my concerns

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