A 5 mm dia. spherical ball at 50°C is covered by 1 mm thick plastic insulation (k = 0.13 W/m.K). The wall is exposed to an ambient at 15°C with h = 20 W/m2°C. Investigate, if the plastic insulation on the ball will help or hurt heat transfer from the ball ? Calculate the heat loss.

A 5 mm dia. spherical ball at 50°C is covered by 1 mm thick plastic insulation (k = 0.13 W/m.K). The wall is exposed to an ambient at 15°C with h = 20 W/m2°C. Investigate, if the plastic insulation on the ball will help or hurt heat transfer from the ball ? Calculate the heat loss.

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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.1P: 1.1 On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed...

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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.

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