Steam at 280 oC, tube=26 W/m. It flows at a speed of 4.0 m/s along a pipe made of iron-steel material with a temperature of 0°C. The inner diameter of the iron-steel pipe is 6.0 cm and the outer diameter is 6.8 cm. In order to reduce the heat transfer, the iron-steel pipe is first covered with 2.0 cm thick glass wool (k = 0.38 W/m. oC), then with another 3.5 cm thick insulation material (k = 0.01 W/m. oC). The insulated iron-steel pipe is in the atmospheric environment where the temperature is 18 oC. The convective heat transfer coefficient on the outside atmospheric side of this pipe, where the steam flows, is 36 W/m2. oC, the film heat transfer coefficient on the steam side is 80 W/m2. Calculate the heat transferred per unit pipe length (W/m), since it is known to be °C. b] Calculate the thickness of the material when the pipe is sheathed externally with a material with a thermal conductivity of k=0.02 W/m.oC in order to reduce the heat to be transferred by 20% in the unit pipe length.
Steam at 280 oC, tube=26 W/m. It flows at a speed of 4.0 m/s along a pipe made of iron-steel material with a temperature of 0°C. The inner diameter of the iron-steel pipe is 6.0 cm and the outer diameter is 6.8 cm. In order to reduce the heat transfer, the iron-steel pipe is first covered with 2.0 cm thick glass wool (k = 0.38 W/m. oC), then with another 3.5 cm thick insulation material (k = 0.01 W/m. oC). The insulated iron-steel pipe is in the atmospheric environment where the temperature is 18 oC. The convective heat transfer coefficient on the outside atmospheric side of this pipe, where the steam flows, is 36 W/m2. oC, the film heat transfer coefficient on the steam side is 80 W/m2. Calculate the heat transferred per unit pipe length (W/m), since it is known to be °C. b] Calculate the thickness of the material when the pipe is sheathed externally with a material with a thermal conductivity of k=0.02 W/m.oC in order to reduce the heat to be transferred by 20% in the unit pipe length.
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
Related questions
Question
a] Steam at 280 oC, tube=26 W/m. It flows at a speed of 4.0 m/s along a pipe made of iron-steel material with a temperature of 0°C. The inner diameter of the iron-steel pipe is 6.0 cm and the outer diameter is 6.8 cm. In order to reduce the heat transfer, the iron-steel pipe is first covered with 2.0 cm thick glass wool (k = 0.38 W/m. oC), then with another 3.5 cm thick insulation material (k = 0.01 W/m. oC). The insulated iron-steel pipe is in the atmospheric environment where the temperature is 18 oC. The convective heat transfer coefficient on the outside atmospheric side of this pipe, where the steam flows, is 36 W/m2. oC, the film heat transfer coefficient on the steam side is 80 W/m2. Calculate the heat transferred per unit pipe length (W/m), since it is known to be °C.
b] Calculate the thickness of the material when the pipe is sheathed externally with a material with a thermal conductivity of k=0.02 W/m.oC in order to reduce the heat to be transferred by 20% in the unit pipe length.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 6 steps with 6 images