Question

Asked Nov 12, 2019

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For the outside walls of a home, two layers are often combined, such as a layer of wood and a layer of sheet rock (plaster). The rate of heat transfer becomes: P = Δ Q/second = A Δ T/ (R_{w}+R_{sr}) .

What is the advantage of using combined 2-cm layers of wood and plaster versus using just a 4-cm layer of wood for home insulation. Assume a wall area A = 15 x 10 ^{-4 }cm^{2, }and an indoor outdoor temperature difference of 15 degrees C.

Step 1

Given,

Step 2

Rate of heat transfer when both material wood and plaster wall are used in combination will be more than in using single wood wall combination because resistance in combination of wood and plaster will be more than resistance of wood wall,

Step 3

Resistance of wood and pl...

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