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Chapter 1 Heat conduction

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Chapter 1 Heat conduction

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    1. Chapter 1 Heat conduction

    2. 1.1 Heat flow through plane wall

    3. 1.1 Heat flow through plane wall

    4. 1.1 Heat flow through plane wall

    6. 1.1 Heat flow through plane wall

    7. 1.1 Heat flow through plane wall

    8. 1.1 Heat flow through plane wall

    9. 1.2 Heat flow through radial system

    10. 1.2 Heat flow through radial system

    12. 1.2 Heat flow through radial system

    14. 1.3 Overall heat transfer coefficient

    15. 1.3 Overall heat transfer coefficient

    16. 1.3 Overall heat transfer coefficient

    18. 1.4 Transient Conduction

    19. 1.4 Unsteady State Conduction

    21. Homework#2 Find the heat transfer per unit area through the composite wall in Figure below. Assume one-dimensional heat flow. A 2.0-in schedule 40 steel pipe (Outer diameter = 2.375 in and inner diameter = 2.067 in) has k = 27 Btu/h.ft.°F. The fluid inside the pipe has h = 30 But/h.ft2. ° F, and the outer surface of the pipe is covered with 0.5-in fiberglass insulation with k = 0.023 Btu/h.ft. °F. The convection coefficient on the outer insulation surface is 2.0 Btu/h.ft. °F. The inner fluid temperature is 320 F and the ambient temperature is 70 °F. Calculate the heat loss per foot of length.

    45. Homework#3 On a hot summer day a concrete driveway may reach a temperature of 50°C. Suppose that a stream of water is directed on the driveway so that the surface temperature is suddenly lowered to 10°C. How long will it take to cool the concrete to 25°C at a depth of 5 cm from the surface? A large slab of aluminum has a thickness of 10 cm and is initially uniform in temperature at 400°C. Suddenly it is exposed to a convection environment at 90C with h = 1400 W/m2. °C. How long does it take the centerline temperature to drop to 180°C? Also calculate the heat loss per unit length.

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