A 4-mm and 2-m-long electric wire is tightly wrapped with a 2-mm-thick plastic cover whose thermal conductivity is k =0.1 W/m-°C. Electrical measurements indicate that a current of 10 A passes through the wire and there is a voltage drop of 10 V along the wire. If the insulated wire is exposed to a medium at 7 =20 °C with a heat transfer coefficient of h=10 W/m2.°C, determine the temperatures T1 and T2 as shown in the figure below. Also determine whether doubling the .thickness of the plastic cover will increase or decrease T2 k To

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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Author:Kreith, Frank; Manglik, Raj M.
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Chapter2: Steady Heat Conduction
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A 4-mm and 2-m-long electric wire is tightly wrapped with a 2-mm-thick plastic cover whose thermal conductivity is k
=0.1 W/m-°C. Electrical measurements indicate that a current of 10 A passes through the wire and there is a voltage drop
of 10 V along the wire. If the insulated wire is exposed to a medium at
=20 °C with a heat transfer coefficient of h=10
T.
W/m2.°C, determine the temperatures T1 and T2 as shown in the figure below. Also determine whether doubling the
.thickness of the plastic cover will increase or decrease T2
T
Transcribed Image Text:A 4-mm and 2-m-long electric wire is tightly wrapped with a 2-mm-thick plastic cover whose thermal conductivity is k =0.1 W/m-°C. Electrical measurements indicate that a current of 10 A passes through the wire and there is a voltage drop of 10 V along the wire. If the insulated wire is exposed to a medium at =20 °C with a heat transfer coefficient of h=10 T. W/m2.°C, determine the temperatures T1 and T2 as shown in the figure below. Also determine whether doubling the .thickness of the plastic cover will increase or decrease T2 T
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