An outer wall is covered by insulating material in order to reduce heat loss. Across which...

An outer wall is covered by insulating material in order to reduce heat loss. Across which layer (bricks or insulation) is the temperature drop is the largest?

Expert Solution

The thermal Conductivity at of various materials are stated below

Brick dense	1.31
Brick, insulating	0.15
Brickwork, common	0.6 -1.0
Brickwork, dense	1.6

Plastics, foamed (insulation materials)

0.03

Wood across the grain, white pine	0.12
Wood across the grain, balsa	0.055
Wood across the grain, yellow pine, timber	0.147
Wood, oak	0.17
Wool, felt	0.07
Wood wool, slab	0.1 - 0.15

A higher Thermal conductivity means a lower temperature drop across the ends. So, the answer to the question depends on what kind of material is being used as insulation.

Most common insulating materials are: insulation bricks, wood and PVC coating. Their thermal conductivities can be compared with that of common bricks from the data given above.

NOTE: Lower thermal conductivity means better insulator, thus, greater temperature drop across it.

Also, while insulating walls, a small air gap is left between layers. Air has a TC of 0.02, thus maximum temp drop is across this layer of air.

genius_generous answered 1 week ago

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