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

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

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.62P

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

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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