A type 316 stainless steel pipe has a 6 cm inside diameter and an 8 cm outside diameter with a 2 mm layer of 85% magnesia insula- tion around it. Liquid at 112°C flows inside with ħ¡ = 346 W/m²K. The air around the pipe is at 20°C, and ħ, = 6 W/m²K. Calculate U based on the inside area. Sketch the equivalent electrical circuit, showing all known temperatures. Discuss the results and suggest an improved design. [T, = 96.36°C]

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Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.31P
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A type 316 stainless steel pipe has a 6 cm inside diameter and an
8 cm outside diameter with a 2 mm layer of 85% magnesia insula-
tion around it. Liquid at 112°C flows inside with h = 346 W/m²K.
The air around the pipe is at 20°C, and h, = 6 W/m²K. Calculate
U based on the inside area. Sketch the equivalent electrical circuit,
showing all known temperatures. Discuss the results and suggest
an improved design. [To = 96.36°C]
%3D
Transcribed Image Text:A type 316 stainless steel pipe has a 6 cm inside diameter and an 8 cm outside diameter with a 2 mm layer of 85% magnesia insula- tion around it. Liquid at 112°C flows inside with h = 346 W/m²K. The air around the pipe is at 20°C, and h, = 6 W/m²K. Calculate U based on the inside area. Sketch the equivalent electrical circuit, showing all known temperatures. Discuss the results and suggest an improved design. [To = 96.36°C] %3D
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