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## Homework Statement

Find the amount of thermal energy that flows per day through a solid oak wall 10.0 cm thick, 3.00 m long, and 2.44 m high, if the temp of the inside wall is 21.1 C while the temp of the outside wall is -6.67 C.

## Homework Equations

Q= k(A)(T2-T1)t/d

coefficient of thermal conductivity for the oak is 1.47 x 10^-1

## The Attempt at a Solution

This is a review question in my textbook and it shows:

=

(0.147 J/m s C) (24.0 m squared) (21.1 C - (-6.67 C))(24 hr)(3600 s/1 hr)

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(0.100 m)

I understand the problem and the application, I am just unsure of how to get the area, A, for these problems. ....how did the 24 m^2 come about?