Q2: Calculate the critical radius of insulation for asbestos [k = 0.162 W/m K]surrounding a pipe and exposed to room air at 25 °C with ho = 2.8 W/m K.Calculate the heat loss from a 200 °C, 50 mm diameter pipe when covered withthe critical radius of insulation and without insulation. Ql: A composite wall is made of 10 mm and 16 mm layers of materials of thermalconductivity 10 and 20 W/m. K. The contact resistance between surfaces is 5 x 10-*m² °C/W. The hot side is exposed to fluid at 400°C with h = 75 W/m2K and thecold side is exposed to fluids at 60°C with h = 400 W/m². K. Determine the heatflow, temperature drop of the first layer and overall heat transfer coefficient.Comment on the contribution of contact resistance.

Answered: Image /qna-images/answer/5e97bb24-1000-4325-a4ce-5affed7d342e.jpg

Q2: Calculate the critical radius of insulation for asbestos [k = 0.162 W/m K] surrounding a pipe and exposed to room air at 25 °C with ho = 2.8 W/m K. Calculate the heat loss from a 200 °C, 50 mm diameter pipe when covered with the critical radius of insulation and without insulation.

Q2: Calculate the critical radius of insulation for asbestos [k = 0.162 W/m K] surrounding a pipe and exposed to room air at 25 °C with ho = 2.8 W/m K. Calculate the heat loss from a 200 °C, 50 mm diameter pipe when covered with the critical radius of insulation and without insulation.

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.

Chapter2: Steady Heat Conduction

Section: Chapter Questions

Problem 2.24P

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Q2: Calculate the critical radius of insulation for asbestos [k = 0.162 W/m K]
surrounding a pipe and exposed to room air at 25 °C with ho = 2.8 W/m K.
Calculate the heat loss from a 200 °C, 50 mm diameter pipe when covered with
the critical radius of insulation and without insulation.

Ql: A composite wall is made of 10 mm and 16 mm layers of materials of thermal
conductivity 10 and 20 W/m. K. The contact resistance between surfaces is 5 x 10-
*m² °C/W. The hot side is exposed to fluid at 400°C with h = 75 W/m2K and the
cold side is exposed to fluids at 60°C with h = 400 W/m². K. Determine the heat
flow, temperature drop of the first layer and overall heat transfer coefficient.
Comment on the contribution of contact resistance.

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