4. On a winter's day the outside temperature of a 17-in thick concrete wall is -29°F, the wall is 15 ft long and 9 ft high. How many BTUS are required to keep the inside of the wall at 70°F? Assume the thermal conductivity of the wall is 0.8 BTU/h ft°F.

4. On a winter's day the outside temperature of a 17-in thick concrete wall is -29°F, the wall is 15 ft long and 9 ft high. How many BTUS are required to keep the inside of the wall at 70°F? Assume the thermal conductivity of the wall is 0.8 BTU/h ft°F.

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 1.10P: 1.10 A heat flux meter at the outer (cold) wall of a concrete building indicates that the heat loss...

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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.

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4. On a winter's day the outside temperature of a 17-in thick concrete wall is -29°F, the wall is 15 ft long and 9 ft
high. How many BTUS are required to keep the inside of the wall at 70°F? Assume the thermal conductivity of the
wall is 0.8 BTU/h ft°F.

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