Example (3): Steam flowing through a long, thin-walled pipe maintains the pipe wall at Uniform temperature of 500 k. the pipe is covered with an insulation.

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Presentation transcript:

Example (3): Steam flowing through a long, thin-walled pipe maintains the pipe wall at Uniform temperature of 500 k. the pipe is covered with an insulation blanket comprised of two different materials, A and B. The interface between the two materials may be assumed to have an infinite contact resistance and the entire out surface is exposed to air for which T = 300 k and h = 25 w/m2.k Sketch the thermal circuit of the system. What is the total heat losses from the pipe a? what are the outer surface temperature, Ts,2(A) Ts,2(B)

Resistance from Radiation Rth = 1/ hr A

Dr Mustafa Nasser

Dr Mustafa Nasser

Dr Mustafa Nasser

Dr Mustafa Nasser

Use different insulator for example fiber glass ..recalculate ..!!

Submit the answer next lecture Home Exercise : for sphere proof that Submit the answer next lecture