Subtopic: Steady state heat transfer in conduction, convection and radiation
Question Statement:
An insulating material has a thermal conductivity of 0.03 W m⁻¹ K⁻¹. If 60 mm of this material is applied as insulation on a heat transfer surface, the R-value of the insulation in m² K W⁻¹ is
Options:
(A) 1
(B) 2
(C) 3
(D) 6
Official Answer Key:
B
Step-by-Step Solution & Explanation
Thermal resistance (R-value) of a slab = thickness / conductivity = L/k. R = 0.060 m / 0.03 W m⁻¹K⁻¹ = 2.0 m²·K/W, matching option (B).
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