# View Policies Show Attempt History An aluminum transmission line with a diameter of 20 mm has...

###### Question:

View Policies Show Attempt History An aluminum transmission line with a diameter of 20 mm has an electrical resistance of Relec' = 2.636 x 109/m and carries a current of 700 A. The line is subjected to frequent and severe cross winds, increasing the probability of contact between adjacent lines, thereby causing sparks and creating a potential fire hazard for nearby vegetation. The remedy is to insulate the line, but with the adverse effect of increasing the conductor operating temperature. (a) Calculate the conductor temperature when the air temperature is 10°C and the line is subjected to cross flow with a velocity of 2 m/s. (b) Calculate the conductor temperature for the same conditions, but with a 2-mm-thick insulation having a thermal conductivity of 0.15 W/m.K. Evaluate the properties of air at 300 K. Physical Properties Mathematical Functions Jason from WileyPLUS Step 1 WileyPLUS Scheduled Maintena As Wiley continues to fine tune Your Answer Correct Answer
Your answer is correct. What is the rate of heat loss by convection per unit length of the transission line, in W/m? q cony 129.16 W/m Attempts: 1 of 3 Step 2 Your Answer Correct Answer What is the Nusselt number for the case without insulation? Jason WileyPLUS SC As Wiley conti NU-
Question 2 of 10 1.7/10 X Your answer is incorrect. What is the line temperature for the case without insulation, in °C? Тcs 27.25 °C Attempts: 1 of 3 used Step 4 Your Answer Correct Answer What is the convection heat transfer coefficient for the case with a 2-mm-thick insulation having a therr W/m.K. in W/m2.K? Jason from WileyPLUS WileyPLUS Scheduled Maintena As Wiley continues to fine tune ho W/m2.K?
Question 2 of 10 1.7/10 Step 5 Your Answer Correct Answer What is the total thermal resistance per unit length for the case with insulation, in K-m/W? Rtot' Km/W? Attempts: 0 of 3 use Step 6 Your Answer Correct Answer Jason fror What is the line temperature for the case with insulation, in "C? WileyPLUS Sche As Wiley continu TC- °C

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