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A 15 mm diameter and 5 m long electric wire is tightly wrapped with 2 mm thick plastic cover whose thermal conductivity is k = 0. 15 W/m °C. Electrical measurements indicate that a current of 5 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 Too = 288,15 K with the heat transfer coefficient of h = 12 w/ m² °C. Determine the temperature at the interface of wire and the plastic cover in steady operation.

A 15 mm diameter and 5 m long electric wire is tightly wrapped with 2 mm thick plastic cover whose thermal conductivity is k = 0. 15 W/m °C. Electrical measurements indicate that a current of 5 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 Too = 288,15 K with the heat transfer coefficient of h = 12 w/ m² °C. Determine the temperature at the interface of wire and the plastic cover in steady operation.

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MED2.docx → GROUB C Example 1 A 15 mm diameter and 5 m long electric wire is tightly wrapped with 2 mm thick plastic cover whose thermal conductivity is k= 0. 15 W/ m °C. Electrical measurements indicate that a current of 5 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 To = 288,15 K with the heat transfer coefficient of h = 12 w/ m² °C. Determine the temperature at the interface of wire and the plastic cover in steady operation. Example 2 Calculate the amount of heat loss (in Watts) through an uncovered window in a home. The temperature difference between the air inside and outside of the house is 200C, with moderate convection on each side of the glass. The size of the glass is 0.75m by 1.2 m, and the thickness is 3 mm. hin = 25 W/ m² °C and hout = 45 W/ m² °C and k = 0,81 W/ m °C %3D %3D EXAMPLE 3 Steam at a temperature of 300 °C flows through a steal pipe, k= 14.9 W/m.K of 60 mm inside diameter and 80 mm outside diameter. The convection coefficient between the steam and the inner surface of the pipe is 500 W/m² K, while that between the outer surface of the pipe and the surroundings is 25 W/m² .K the temperature of the surroundings air is 25 C. -What is the heat loss per unit length of pipe?
Transcribed Image Text:MED2.docx → GROUB C Example 1 A 15 mm diameter and 5 m long electric wire is tightly wrapped with 2 mm thick plastic cover whose thermal conductivity is k= 0. 15 W/ m °C. Electrical measurements indicate that a current of 5 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 To = 288,15 K with the heat transfer coefficient of h = 12 w/ m² °C. Determine the temperature at the interface of wire and the plastic cover in steady operation. Example 2 Calculate the amount of heat loss (in Watts) through an uncovered window in a home. The temperature difference between the air inside and outside of the house is 200C, with moderate convection on each side of the glass. The size of the glass is 0.75m by 1.2 m, and the thickness is 3 mm. hin = 25 W/ m² °C and hout = 45 W/ m² °C and k = 0,81 W/ m °C %3D %3D EXAMPLE 3 Steam at a temperature of 300 °C flows through a steal pipe, k= 14.9 W/m.K of 60 mm inside diameter and 80 mm outside diameter. The convection coefficient between the steam and the inner surface of the pipe is 500 W/m² K, while that between the outer surface of the pipe and the surroundings is 25 W/m² .K the temperature of the surroundings air is 25 C. -What is the heat loss per unit length of pipe?
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