Problem 1. How water at an average temperature of 90°C is flowing through a 15-m section of a cast iron pipe (k = 52 W/m-C) whose inner and outer diameters are 4 cm and 4.6 cm, respectively. The outer surface of the pipe, whose emissivity is 0.7, is exposed to the cold air at 10°C in the basement, with a heat transfer coefficient of 15 W/m2-C. The heat transfer coefficient at the inner surface of the pipe is 120 W/m²- C. Taking the walls of the basement to be at 10°C also, determine the rate of heat loss from the hot water. Also, determine the average velocity of the water in the pipe if the temperature of the water drops by 3°C as it passes through the basement.

Problem 1. How water at an average temperature of 90°C is flowing through a 15-m section of a cast iron pipe (k = 52 W/m-C) whose inner and outer diameters are 4 cm and 4.6 cm, respectively. The outer surface of the pipe, whose emissivity is 0.7, is exposed to the cold air at 10°C in the basement, with a heat transfer coefficient of 15 W/m2-C. The heat transfer coefficient at the inner surface of the pipe is 120 W/m²- C. Taking the walls of the basement to be at 10°C also, determine the rate of heat loss from the hot water. Also, determine the average velocity of the water in the pipe if the temperature of the water drops by 3°C as it passes through the basement.

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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Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

Heat transfer

Problem 1. How water at an average temperature of 90°C is flowing through a
15-m section of a cast iron pipe (k = 52 W/m-C) whose inner and outer diameters are
4 cm and 4.6 cm, respectively. The outer surface of the pipe, whose emissivity is 0.7,
is exposed to the cold air at 10°C in the basement, with a heat transfer coefficient of
15 W/m2-C. The heat transfer coefficient at the inner surface of the pipe is 120 W/m2-
C. Taking the walls of the basement to be at 10°C also, determine the rate of heat loss
from the hot water. Also, determine the average velocity of the water in the pipe if the
temperature of the water drops by 3°C as it passes through the basement.
%3D

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