The the thermal conductivity of a sheet of rigid, extruded insulation is reported to be k=0.029 w/ m measured temperature difference across a 25-mm-thick sheet of the material is t1 - 72 = 12°c. (a) what is the heat flux through a 3 mx 3 m sheet of the insulation? (b) what is the rate of heat transfer through the sheet of insulation? (c) what is the thermal resistance of the sheet due to conduction?

Heat flux = 13.92 W/m2

Rate of heat transfer throug the 3m x 3m sheet = 125.28 W

The thermal resistance of the 3x3m sheet is 0.0958 K/W

Explanation:

The rate of heat transfer through a 3m x 3m sheet of insulation can be calculated as:

The heat flux can be defined as the amount of heat flow by unit of area.

Using the previous calculation, we can estimate the heat flux:

It can also be calculated as:

The thermal resistance can be expressed as

For the 3m x 3m sheet, the thermal resistance is

i believe the answer is a.

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