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.
Calculate the thermal conductivity of the insulating material. Also, determine how
thick the insulation should be to provide R-value of: (a) R-30, (b) R-20.
The thermal conductivity of the material is approximately k = 0.28 Btu/h.in. °F .
To provide enough insulation to provide R-value of R-30:
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