A manufacturer of loose-fill cellulose insulating material provides a table showing the relationship between the thickness of the material and its R-value. The manufacturer’s data is shown in the accompanying table. R -value (m2 ⋅K/W) Thickness (mm) R -40                           275 R -32                           225 R -24                           162 R- 19                           132 R -13                           88 Calculate the thermal conductivity of the insulating material. Also, determine how thick the insulation should be to provide R-values of a. R-30 b. R-20 11.9

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A manufacturer of loose-fill cellulose insulating material provides a table showing the relationship between the thickness of the material and its R-value. The manufacturer’s data is shown in the accompanying table.

R -value (m2 ⋅K/W) Thickness (mm)

R -40                           275

R -32                           225

R -24                           162

R- 19                           132

R -13                           88

Calculate the thermal conductivity of the insulating material. Also, determine how thick the insulation should be to provide R-values of

a. R-30

b. R-20 11.9 

 

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