p19_066.pdf

5 . 0 ◦ C. Less controversial are the assumptions that the bottom of the body of water is at

T H =4 . 0 ◦ C and the interface between the ice and the water is at T X =0 . 0 ◦ C. The primary mechanism

for the heat transfer through the total distance L =1 . 4 m is assumed to be conduction, and we use

Eq. 19-34:

k water A ( T H −

T X )

k ice A ( T X −

T C )

−

L ice

(0 . 12) A (4 . 0 ◦ −

0 . 0 ◦ )

(0 . 40) A (0 . 0 ◦ +5 . 0 ◦ )

L ice

1 . 4

−

L ice

We cancel the area A and solve for thickness of the ice layer: L ice =1 . 1m.

66. We assume (although this should be viewed as a “controversial” assumption) that the top surface of the

ice is at T C =

−