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eng.thermal-conductivity-calc Calculator
Calculates thermal conductivity, thermal resistance, and heat flux through a material or composite wall from Fourier's law. Thermal conductivity of air is 0.026 W/mK; aluminium is 205 W/mK — a 8,000× difference that explains why metal surfaces feel cold to touch.
Inputs
Length
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
K
How easily heat flows through the material (W/m·K). Metals are high; insulation materials are very low.
Area
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Delta T
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Results
heat flow Q (W)
The value at the specified point or condition.
thermal resistance R (m^2K/W)
Opposition to heat flow (K/W). Higher = better insulation. Works like electrical resistance — resistances in series add, in parallel follow the reciprocal rule.
U-value (W/m^2K)
The computed numeric or monetary value.
heat flux (W/m^2)
The value at the specified point or condition.
annual heat loss (kWh)
The result expressed on a per-year basis.
Q = kA*dT/L (Fourier)
Reference formula or conversion factor shown for context.