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Unformatted text preview: of the pipe is 300 ° F. (b) What is the change in temperature across the pipe wall? 2 of 2 4. (6 points) Refer to the steam pipe in Problem 2. The steam temperature is 300 ° F, and the convective heat transfer coefficient inside the pipe is 1000 Btu/hr ⋅ ft ⋅ ° F. The air temperature on the outside of the pipe is 90 ° F, and the outside heat transfer coefficient due to natural convection is 30 Btu/hr ⋅ ft ⋅ ° F. (a) For personnel protection, the outside surface of the insulation must be less than 110 ° F. What is the minimum thickness of insulation in inches. Suggestion: Set up a spreadsheet and use the Solver tool to find the thickness of insulation that makes the surface temperature of the insulation equal to 110 ° F. (b) Calculate the overall heat transfer coefficient in Btu/hr ⋅ ft 2 ⋅ ° F based on the outside area. 5. (3 points) Problem 3.72 in Incropera, et al., 6 th Edition....
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 Fall '11
 staff
 Heat, Heat Transfer, 1inch, 2inch, 30 Btu, 0.036 Btu

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