= Consider a long resistance wire of radius r₁ = 0.3 cm and thermal conductivity kwire 18 W/m. °C in which heat is generated uniformly at a constant rate of g = 1.5 W/cm³ as a result of resistance heating. The wire is embedded in a 0.4-cm- thick layer of plastic whose thermal conductivity is kplastic = 1.8 W/m. °C. The outer surface of the plastic cover loses heat by convection to the ambient air at T = 25°C with an average combined heat transfer coefficient of h = 14 W/m². °C. As- suming one-dimensional heat transfer, determine the tempera- tures at the center of the resistance wire and the wire-plastic layer interface under steady conditions. Answers: 97.1°C, 97.3°C
= Consider a long resistance wire of radius r₁ = 0.3 cm and thermal conductivity kwire 18 W/m. °C in which heat is generated uniformly at a constant rate of g = 1.5 W/cm³ as a result of resistance heating. The wire is embedded in a 0.4-cm- thick layer of plastic whose thermal conductivity is kplastic = 1.8 W/m. °C. The outer surface of the plastic cover loses heat by convection to the ambient air at T = 25°C with an average combined heat transfer coefficient of h = 14 W/m². °C. As- suming one-dimensional heat transfer, determine the tempera- tures at the center of the resistance wire and the wire-plastic layer interface under steady conditions. Answers: 97.1°C, 97.3°C
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.38P:
2.38 The addition of aluminum fins has been suggested to increase the rate of heat dissipation from...
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