Hot water at an average temperature of 80°C and an average velocity of 1.5 m/s is flowing through a 25-m section of a pipe that has an outer diameter of 5 cm. The pipe extends 2 m in the ambient air above the ground, dips into the ground (k= 1.5 W/m°C) vertically for 3 m, and continues horizontally at this depth for 20 m more before it enters the next building. The first section of the pipe is exposed to the ambient air at 8°C with a heat transfer coefficient of 22 W/m2.°C. If the surface of the ground is covered with snow at 0°C, determine: (a) Heat loss from the part of the tube that is on the ground. (b) Heat loss for vertical part of the tube. (c) The shape factor, and the rate of heat loss on the horizontal part that is in the ground. (d) Total rate of heat loss from the hot water. (e) The temperature drop of the hot water as it flows through this 25-m section of the wall.

Hot water at an average temperature of 80°C and an average velocity of 1.5 m/s is flowing through a 25-m section of a pipe that has an outer diameter of 5 cm. The pipe extends 2 m in the ambient air above the ground, dips into the ground (k= 1.5 W/m°C) vertically for 3 m, and continues horizontally at this depth for 20 m more before it enters the next building. The first section of the pipe is exposed to the ambient air at 8°C with a heat transfer coefficient of 22 W/m2.°C. If the surface of the ground is covered with snow at 0°C, determine: (a) Heat loss from the part of the tube that is on the ground. (b) Heat loss for vertical part of the tube. (c) The shape factor, and the rate of heat loss on the horizontal part that is in the ground. (d) Total rate of heat loss from the hot water. (e) The temperature drop of the hot water as it flows through this 25-m section of the wall.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.

Question

solve last two parts only

Hot water at an average temperature of 80°C and an average velocity of 1.5 m/s is flowing
through a 25-m section of a pipe that has an outer diameter of 5 cm. The pipe extends
2 m in the ambient air above the ground, dips into the ground (k= 1.5 W/m-°C) vertically for 3
m, and continues horizontally at this depth for 20 m more before it enters thenext building.
The first section of the pipe is exposed to the ambient air at 8°C with a heat transfer coefficient
of 22 W/m2.°C. If the surface of the ground is covered with snow at 0°C, determine:
(a) Heat loss from the part of the tube that is on the ground.
(b) Heat loss for vertical part of the tube.
The shape factor, and the rate of heat loss on the horizontal part that is in the ground.
(d) Total rate of heat loss from the hot water.
(e) The temperature drop of the hot water as it flows through this 25-m section of the wall.

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