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A 3-mm-diameter and 5-m-long electric wire is tightly wrapped with a 2-mm- thick plastic cover whose thermal conductivity is k=0.15 W/m · °C. Electrical measurements indicate that a current of 10 A passes through the wire and there is a voltage drop of 8 V along the wire. If the insulated wire is exposed to a medium at T=30°C with a heat transfer coefficient of h=12 W/m2 · °C, determine the temperature at the interface of the wire and the plastic cover in steady operation.

A 3-mm-diameter and 5-m-long electric wire is tightly wrapped with a 2-mm- thick plastic cover whose thermal conductivity is k=0.15 W/m · °C. Electrical measurements indicate that a current of 10 A passes through the wire and there is a voltage drop of 8 V along the wire. If the insulated wire is exposed to a medium at T=30°C with a heat transfer coefficient of h=12 W/m2 · °C, determine the temperature at the interface of the wire and the plastic cover in steady operation.

Refrigeration and Air Conditioning Technology (MindTap Course List)
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter2: Matter And Energy
Section: Chapter Questions
Problem 18RQ: Describe Dalton's law as it relates to a confined mixture of non-reactive gases.
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A 3-mm-diameter and 5-m-long electric wire is tightly wrapped with a 2-mm-

thick plastic cover whose thermal conductivity is k=0.15 W/m · °C. Electrical

measurements indicate that a current of 10 A passes through the wire and there is a voltage drop of 8 V along the wire. If the insulated wire is exposed to a

medium at T=30°C with a heat transfer coefficient of h=12 W/m2 · °C, determine the temperature at the interface of the wire and the plastic cover in steady operation.

k T₁ T₂ 2 h Too
Transcribed Image Text:k T₁ T₂ 2 h Too
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