Physics, 29.02.2020 00:54 hjohnsonn102010
An insulated pipe carries steam at 300°C. The pipe is made of stainless steel (with k = 15 W/mK), has an inner diameter is 4 cm, and has an outer diameter is 4.5 cm. Fiberglass insulation (with k= 0.038 W/mK and ε = 0.9) of 2.5 cm thickness covers the pipe. Consider the pipe to be inside a large room with air and wall temperatures of 20°C. If the convective heat transfer coefficient inside the pipe is 75 W/m² and the convective heat transfer coefficient outside the pipe is 10 W/m², find the rate of heat loss per-unit-length (W/m) from the pipe and the temperature of the outer surface of the insulation. Note 1: You may find helpful example problems in Incropera and DeWitt. Note 2: You will need to guess a temperature for the outside of the pipe to compute an estimated hrad. After solving for the temperature of the outside using your thermal circuit, evaluate how close your original estimate was. Then iterate (repeat the math) with the new surface temperature. Consider coding your computations in R or Python to make this go faster.
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An insulated pipe carries steam at 300°C. The pipe is made of stainless steel (with k = 15 W/mK), ha...
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