Answered: om the steam pipe by 90% using a layer…

om the steam pipe by 90% using a layer of glass fiber as the insulation. Determir e required thickness of the insulation. The thermal conductivity of the glass fib 0.04 W/m.K.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter10: Heat Exchangers

Section: Chapter Questions

Problem 10.51P

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Free Body Diagram

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.

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Transcribed Image Text:Superheated steam at 350 °C flows through a pipe whose thermal conductivity is kp = 16 W/m.K. The inner diameter and thickness of the pipe are 26 cm and 1 cm, respectively. The surrounding temperature is 28 °C. The convective heat transfer coefficient at the steam side and the outside of the pipe is 90 W/m?.K and 15 W/m?.K, respectively. Derive an expression for the temperature profile across the pipe thickness as a function of the radial position r. T. = 28 °C, h, = 15 W/m?.K T; = 350 °C h; = 90 W/m?.K Cross-sectional view of the pipe

Consider the steam pipe of Problem 1. The objective is to reduce the heat losses
from the steam pipe by 90% using a layer of glass fiber as the insulation. Determine
the required thickness of the insulation. The thermal conductivity of the glass fiber
is 0.04 W/m.K.
Insulation

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