The brick wall (of thermal conductivity
0.41 W/m ·
◦ C) of a building has dimensions
of 5.9 m by 4 m and is 16 cm thick.
How much heat flows through the wall in
a 17.2 h period when the average inside and
outside temperatures are, respectively, 14◦C
and 3◦C?
Answer in units of MJ.

0.000665255mj

Explanation:

thermal conductivity(k)=0.41w/m°C

Area(a)=5.9x4=23.6m^2

Thickness(t)=16cm=16/100=0.16m

Change in temperature(T)=14-3=11°C

Quantity of heat=Q

Q=(kxaxT) ➗ t

Q=(0.41x23.6x11) ➗ 0.16

Q=106.436 ➗ 0.16

Q=665.255j=0.000665255mj

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explanation:

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