Question

Which material will transfer more heat? Either a material with thermal conductivity = 121W⁄(m°C) or = 22 W⁄(m°C) . Justify your answer.

Answer 1

Answer:

Lastly, the heat transfer rate depends on the material properties described by the coefficient of thermal conductivity. All four factors are included in a simple equation that was deduced from and is confirmed by experiments. The rate of conductive heat transfer through a slab of material, such as the one in Figure 3, is given by

Q

t

=

k

A

(

T

2

−

T

1

)

d

,

where  

Q

t

is the rate of heat transfer in watts or kilocalories per second, k is the thermal conductivity of the material, A and d are its surface area and thickness, as shown in Figure 3, and (T2 − T1) is the temperature difference across the slab. Table 1 gives representative values of thermal conductivity.

Explanation: