Thermodynamics
Thermal Resistance
Thermal analog of electrical resistance. ΔT = P × R_th.
Variables
R_thK/W
Thermal resistance
Resistance to heat flow
Lm
Length
Thickness of material
kW/(m·K)
Thermal conductivity
Material property
Am²
Cross-sectional area
Area of heat flow
Derivation
From P = kAΔT/L, define R_th = L/(kA) so ΔT = P·R_th. Resistances add in series.
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