A cold storage room has a wall consists of an inside finish of 0.60 in cement plaster (k = 0.67), two layers of corkboard each 2.5 in thick (k = 0.03) and an outside layer of building tile. The value of U for the entire wall is 0.058, the internal air film coefficient is 1.65, the inner temperature is 23°F and the outside temperature is 85°F. Calculate the heat flow through the unit wall area, Btu/hr.ft2 A. 1.47 B. 2.47 C. 3.47 D. 4.47

A cold storage room has a wall consists of an inside finish of 0.60 in cement plaster (k = 0.67), two layers of corkboard each 2.5 in thick (k = 0.03) and an outside layer of building tile. The value of U for the entire wall is 0.058, the internal air film coefficient is 1.65, the inner temperature is 23°F and the outside temperature is 85°F. Calculate the heat flow through the unit wall area, Btu/hr.ft2 A. 1.47 B. 2.47 C. 3.47 D. 4.47

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.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.26P

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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

A cold storage room has a wall consists of an inside finish of 0.60 in cement plaster
(k = 0.67), two layers of corkboard each 2.5 in thick (k = 0.03) and an outside layer of building tile. The value of U for the entire wall is 0.058, the internal air film
coefficient is 1.65, the inner temperature is 23°F and the outside temperature is
85°F. Calculate the heat flow through the unit wall area, Btu/hr.ft2
A. 1.47 B. 2.47 C. 3.47 D. 4.47

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