A long, uninsulated steam line with a diameter of (100 mathrm{~mm}) and a surface emissivity of 0.8
Question:
A long, uninsulated steam line with a diameter of \(100 \mathrm{~mm}\) and a surface emissivity of 0.8 transports steam at \(150^{\circ} \mathrm{C}\) and is exposed to atmospheric air and large surroundings at an equivalent temperature of \(20^{\circ} \mathrm{C}\).
(a) Calculate the rate of heat loss per unit length for a calm day.
(b) Calculate the rate of heat loss on a breezy day when the wind speed is \(8 \mathrm{~m} / \mathrm{s}\).
(c) For the conditions of part (a), calculate the rate of heat loss with a 20-mm-thick layer of insulation ( \(k=\) \(0.08 \mathrm{~W} / \mathrm{m} \cdot \mathrm{K})\). Would the heat loss change significantly with an appreciable wind speed?
Step by Step Answer:
Fundamentals Of Heat And Mass Transfer
ISBN: 9781119220442
8th Edition
Authors: Theodore L. Bergman, Adrienne S. Lavine