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ProblemSet2_11

# ProblemSet2_11 - Problem Set#2 Due Wednesday 4/14 1 The...

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Problem Set #2 Due Wednesday 4/14 1. The planar, composite wall shown below consists of common building brick (k=0.72W/mK) and fiberboard sheathing (k=0.06 W/mK). The wall is in contact with air on both sides, with the temperatures and heat transfer coefficients shown. a. Find the total thermal resistance to heat transfer through the wall. b. Find the overall heat transfer coefficient. c. Calculate the heat flux through the wall. d. Calculate the temperatures of the air/solid interfaces for both the brick and the sheathing. T ,1 = 45 o C h 1 = 25 W m 2 K T 3 T 1 T 2 T ,2 = 25 o C h 1 = 8 W m 2 K sheathing 2 cm 10 cm brick air air

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2. An insulated steel pipe carries steam at 180 ° C in a room where the air temperature is 25 ° C. Calculate the heat loss per meter of pipe length, as shown below. The physical parameters are given by r 1 = 2cm, r 2 = 2.5cm, r 3 = 4.0cm k 1 = 43W/mK, k 2 = 0.04W/ mK T i = 180 o C, T 0 = 25 o C h i = 12kW /m 2 K, h 0 = 6W /m 2 K . k 1 k 2 insulation pipe steam r 2 r 1 r 3 air T 0 , h 0 T i , h i
3. A spherical tank is to be used as a container for liquefied petroleum gas.

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