A 2.2-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 K.Electrical measurements indicate that a current of 13 A passes through the wire and there is a voltage drop of 8 V along the wire. Assume that theinsulated wire is exposed to a medium at T = 48°C with a heat transfer coefficient of h = 24 W/m KElectricalwireInsulationThe heat generated isv in WattsThe total thermal resistance isv in C/WThe temperature at the interface of the wire and the plastic cover isv in Co

Given:d=2.2 mmL=10 mt=1 mmk=0.15 W/m.Ki=13 AV=8 VT∞=48°Ch=24 W/m2.K

A 2.2-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 Wim Electrical measurements indicate that a current of 13 A passes through the wire and there is a voltage drop of 8 V along the wire. Assume tha insulated wire is exposed to a medium at T = 48°C with a heat transfer coefficient of h 24 W/m K. Electrical wire Insulation The heat generated is v in Watts The total thermal resistance is v in C/W The temperature at the interface of the wire and the plastic cover is v in Co

A 2.2-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 Wim Electrical measurements indicate that a current of 13 A passes through the wire and there is a voltage drop of 8 V along the wire. Assume tha insulated wire is exposed to a medium at T = 48°C with a heat transfer coefficient of h 24 W/m K. Electrical wire Insulation The heat generated is v in Watts The total thermal resistance is v in C/W The temperature at the interface of the wire and the plastic cover is v in Co

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...

See similar textbooks

Similar questions

1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss through a wall of 10-cm thickness is . If a thermocouple at the inner surface of the wall indicates a temperature of 22°C while another at the outer surface shows 6°C, calculate the thermal conductivity of the concrete and compare your result with the value in Appendix 2, Table 11.
1.1 On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed to temperature of –5°C, while the inner surface is kept at 20°C. The thermal conductivity of the concrete is 1.2 W/m K. Determine the heat loss through the wall, which is 10-m long and 3-m high. Problem 1.1
1 mm thick copper plate (k=386 W/m-c) that are 15 cm x 20 cm in size if the thermal contact conductance on both sides of the copper plate is estimated to be 6,000 W/m-c, determine the % error involved in the total thermal resistance of the plate if the thermal contact conductance are ignored.
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·K. 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 30 deg C with a heat transfer coefficient of h=12 W / m ^2-C. determine the temperature at the interface of the wire and the critical radius
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 T = 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 determine if doubling the thickness of the plastic cover will increase or decrease this interface temperature. Tair = 30°C Electrical wire Insulation 10 m
The exterior wall of a house is composed of a 20 cm thick layer of ordinary brick (conductivity 0.72 W/m K) and a 2.5 cm layer of plaster (conductivity 0.17 W/m K ) on each side (two layers in total). Other purely conductive resistances can be neglected, such as the layer of paint on both sides of the wall. Assume the outer face of the wall is at 35 °C and the inner face is at 20 °C and fill in the gaps. The magnitude of the heat flux through the wall corresponds to the _________ W/m2 and is perpendicular to the wall ________________(fill in with "outside-in" or "inside-out") of the environment. If the wall has a total area of 300m2, the heat transfer rate corresponds to ___________________
A 90-amp electric current is flowing through a 6-mm diameter lead wire. The thermal conductivity of the lead is k= 32 W/m K and the electrical resistance per unit length of the wire is R' = 0.0073 /m. The outer surface of the lead wire is exposed to 40°C air with a convection heat transfer coefficient of h=12 W/m².K. Find the temperature at the center of the lead wire.
An experiment was conducted to measure thermal conductivity of a formulated food. The measurement was made by using a large plane plate of the food material, which was 5 mm thick. It was found, under steady-state conditions,that when a temperature difference of 35°C was maintained between the two surfaces of the plate, a heat-transfer rate per unit area of 4700 W/m 2 was measured near the center of either surface. Calculate the thermal conductivity of the product, and list two assumptions used in obtaining the result.
The section of a vertical wall is made up of fiberglass insulation slabs separated by wooden studs. The thermal conductivity of fiberglass and wood are 0.04 W/m-K and 0.18 W/m-K, respectively. The thickness of the wall is 160 mm. The temperatures of the inner and outer surfaces of the wall section are 22 °C and 4 °C, respectively. The ratio of the insulation area to the total wall area is 0.8. Calculate the total heat flow rate (in W/m2) through the wall per unit area. Wooden Stud Fiberglass Insulation Round your answer to 2 decimal places. Add your answer Follow-up question to Question 4, calculate the rate of heat flow (in W/m2) through unit area of studs. Round your answer to 2 decimal places.
The wall of the furnace is 30.48 mm thick and is insulated from outside. Thermal conductivity of the wall material is 0.1 W/m K and the insulation material is 0.01 W/m K. The furnace operates at 650 0C and the ambient temperature is 30 0 Allowable temperature on the outer side of the insulation is 1000C. Determine the overall heat transfer by conduction per unit area occurring across a furnace wall made from clay. If the air side heat transfer coefficient is 0.4 W/m2 K, calculate the minimum insulation thickness requirement.
The wall of the furnace is 30.48 mm thick and is insulated from outside. Thermal conductivity of the wall material is 0.1 W/m K and the insulation material is 0.01 W/m K. The furnace operates at 650 0C and the ambient temperature is 30 0 Allowable temperature on the outer side of the insulation is 1000C. Determine the overall heat transfer by conduction per unit area occurring across a furnace wall made from clay.If the air side heat transfer coefficient is 0.4 W/m2 K, calculate the minimum insulation thickness requirement. please provide the answers with proper steps along with clear explanations and pictures
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