Thermal Resistance of Layers
Combine layer thicknesses and conductivities into area-normalized resistance.
Your numbers
Area-normalized resistance
One-dimensional steady layers with perfect contact. Surface films, thermal bridges and moisture effects are excluded.
Scenario comparison
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Formula
R=ΣLᵢ/kᵢ; U=1/R
Combine layer thicknesses and conductivities into area-normalized resistance.
Worked example
- Layer thicknesses (m)
- 0.1, 0.2
- Conductivities (W/m·K)
- 0.04, 0.2
- Area-normalized resistance
- 3.5 m²·K/W
- Conductance U without surface films
- 0.285714285714 W/m²·K
Scope and limitations
One-dimensional steady layers with perfect contact. Surface films, thermal bridges and moisture effects are excluded.
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Formula version: eff589740323 · Example checked: