Q.4/A 2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-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 Ts= 30°C with a heat transfer coefficient of h-24 W/m² C, determine the temperature at the interface of the wire and the plastic cover in steady operation. Also find the critical radius of plastic insulation. [33.4 T=30°C Electrical wire Insulation 10 m
Q.4/A 2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-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 Ts= 30°C with a heat transfer coefficient of h-24 W/m² C, determine the temperature at the interface of the wire and the plastic cover in steady operation. Also find the critical radius of plastic insulation. [33.4 T=30°C Electrical wire Insulation 10 m
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.
Chapter4: Numerical Analysis Of Heat Conduction
Section: Chapter Questions
Problem 4.32P
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![Q4/A 2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-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 Ts=
30°C with a heat transfer coefficient of h-24 W/m² C, determine the temperature at the interface of the wire
and the plastic cover in steady operation. Also find the critical radius of plastic insulation.
[334
T=30°C
Electrical
wire
Insulation
bale
10 m](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F5c197dd2-d77d-4637-b66d-2ef3870cd0e8%2Ffbda150e-7d6e-4970-a51b-ba0fa6bf68ce%2Fuc8jcp8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q4/A 2-mm-diameter and 10-m-long electric wire is tightly wrapped with a 1-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 Ts=
30°C with a heat transfer coefficient of h-24 W/m² C, determine the temperature at the interface of the wire
and the plastic cover in steady operation. Also find the critical radius of plastic insulation.
[334
T=30°C
Electrical
wire
Insulation
bale
10 m
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