Thermodynamics HW Solutions 193

# Thermodynamics HW Solutions 193 - Chapter 15 Steady Heat...

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Chapter 15 Steady Heat Conduction C/W 065 . 0 025 . 0 04 . 0 1 , 1 ° = + = + = mid total R R R Then the temperature at the point where The sections B, D, and E meet becomes C 263 ° = ° ° = = ⎯→ = C/W) W)(0.065 571 ( C 300 1 1 total total R Q T T R T T Q & & ( c ) The temperature drop across the section F can be determined from C 143 ° = ° = = Δ Δ = C/W) W)(0.25 571 ( F F R Q T R T Q & & 3-59 A coat is made of 5 layers of 0.1 mm thick synthetic fabric separated by 1.5 mm thick air space. The rate of heat loss through the jacket is to be determined, and the result is to be compared to the heat loss through a jackets without the air space. Also, the equivalent thickness of a wool coat is to be determined. Assumptions 1 Heat transfer is steady since there is no indication of change with time. 2 Heat transfer through the jacket is one-dimensional. 3 Thermal conductivities are constant. 4 Heat transfer coefficients account for the radiation heat transfer. Properties The thermal conductivities are given to be k = 0.13 W/m °C for synthetic fabric, k = 0.026 W/m °C for air, and k = 0.035 W/m °C for wool fabric. Analysis The thermal resistance network and the individual thermal resistances are
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