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Q4/ Steam at T1=320°C flows in a cast iron pipe (k=80W/m. C) whose inner and outer diameters are D,=5cm, and D,-5.5cm, respectively. The pipe is covered with 3 cm thick glass wool insulation with k=0.05W/m.C. Heat is lost to the surroundings at T2-5°C by natural convection and radiation, with a combined heat transfer coefficient to be 2o h,=18W/m. C. Taking the heat transfer coefficient inside the pipe to be h=60W/m.C, determine the rate of heat loss from the steam per unit 20 length of the pipe. Also determine the temperature drops across the pipe shell and the insulation.

Q4/ Steam at T1=320°C flows in a cast iron pipe (k=80W/m. C) whose inner and outer diameters are D,=5cm, and D,-5.5cm, respectively. The pipe is covered with 3 cm thick glass wool insulation with k=0.05W/m.C. Heat is lost to the surroundings at T2-5°C by natural convection and radiation, with a combined heat transfer coefficient to be 2o h,=18W/m. C. Taking the heat transfer coefficient inside the pipe to be h=60W/m.C, determine the rate of heat loss from the steam per unit 20 length of the pipe. Also determine the temperature drops across the pipe shell and the insulation.

Elements Of Electromagnetics
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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Heat Transfer (Third year) 2020- 2021 Homework 01-03-2021 By Dr. Basil Noori Merzah one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall. Q4/ Steam at T01-320°C flows in a cast iron pipe (k=80W/m. C) whose inner and outer diameters are D,=5cm, and D,-5.5cm, respectively. The pipe is covered with 3 cm thick glass wool insulation with k=0.05W/m. C. Heat is lost to the surroundings at T2-5°C by natural convection and radiation, with a combined heat transfer coefficient to be h,=18W/m."C. Taking the heat transfer coefficient inside the pipe to be 2 0 h,-60W/m. C, determine the rate of heat loss from the steam per unit length of the pipe. Also determine the temperature drops across the pipe shell and the insulation. Q5/ Determine the overall heat transfer coefficient U based on the outer surface of a D=2.5cm, and D =3.34 cm steel pipe (k=54.0W/m. C) for the following conditions: inside and outside heat transfer coefficients are 1200W/m".C. and 2000W/m.C respectively. If the temperature of inner fluid and outer fluid are 600°C and 300 C, calculate the heat transfer through one meter length and the temperature of the outer surface. Q6/ A 5-m internal diameter spherical tank made of 1.5cm thick stainless steel (k=15W/m. C) is used to store iced water at 0'C. The tank is located in a room whose temperature is 20 C. Heat transfer between the outer surface of the tank and the surroundings is by natural convection only. The convection heat transfer coefficients at the inner and outer surfaces of the tank are 80W/m C and 10W/m."C, respectively. Determine the rate of heat transfer to the iced water in the tank and the amount of ice at 0°C that melts during a 24-h period. The heat of fusion of water at atmospheric pressure is h=333.7kJ/kg fg (2)
Transcribed Image Text:Heat Transfer (Third year) 2020- 2021 Homework 01-03-2021 By Dr. Basil Noori Merzah one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall. Q4/ Steam at T01-320°C flows in a cast iron pipe (k=80W/m. C) whose inner and outer diameters are D,=5cm, and D,-5.5cm, respectively. The pipe is covered with 3 cm thick glass wool insulation with k=0.05W/m. C. Heat is lost to the surroundings at T2-5°C by natural convection and radiation, with a combined heat transfer coefficient to be h,=18W/m."C. Taking the heat transfer coefficient inside the pipe to be 2 0 h,-60W/m. C, determine the rate of heat loss from the steam per unit length of the pipe. Also determine the temperature drops across the pipe shell and the insulation. Q5/ Determine the overall heat transfer coefficient U based on the outer surface of a D=2.5cm, and D =3.34 cm steel pipe (k=54.0W/m. C) for the following conditions: inside and outside heat transfer coefficients are 1200W/m".C. and 2000W/m.C respectively. If the temperature of inner fluid and outer fluid are 600°C and 300 C, calculate the heat transfer through one meter length and the temperature of the outer surface. Q6/ A 5-m internal diameter spherical tank made of 1.5cm thick stainless steel (k=15W/m. C) is used to store iced water at 0'C. The tank is located in a room whose temperature is 20 C. Heat transfer between the outer surface of the tank and the surroundings is by natural convection only. The convection heat transfer coefficients at the inner and outer surfaces of the tank are 80W/m C and 10W/m."C, respectively. Determine the rate of heat transfer to the iced water in the tank and the amount of ice at 0°C that melts during a 24-h period. The heat of fusion of water at atmospheric pressure is h=333.7kJ/kg fg (2)
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