3013-11 Hw-5(1) (1)

3013-11 Hw-5(1) (1) - of the pipe is 300 F. (b) What is the...

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1 of 2 CHE 3013 Rate Operations I Fall 2011 Homework 5 Due: Monday, September 26, 2011 5 Problems, 18 points total 1. (3 points) Consider the flat plate and cylinder shown below. The inner and outer surfaces are at temperatures T 1 and T 2 , respectively. For one-dimensional, steady-state heat transfer with constant properties, sketch the temperature distribution on T-x coordinates for the flat plate and T-r coordinates for the cylinder. In each case, give a brief explanation justifying the shape of the temperature profile. r 1 r 2 x 1 x 2 x (a) (b) 2. (3 points) Problem 3.2 (a) in Incropera, et al., 6 th Edition. 3. (3 points) A 1-inch Schedule 40 carbon steel pipe ( k = 35 Btu/hr ft ° F) carries saturated steam at 300 ° F. The pipe is insulated with a 2-inch thick layer of calcium silicate insulation ( k = 0.036 Btu/hr ft ° F). The temperature at the outside surface of the insulation is 90 ° F. (a) Calculate the heat loss per foot of pipe in Btu/hr assuming the temperature at the inside wall
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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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3013-11 Hw-5(1) (1) - of the pipe is 300 F. (b) What is the...

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