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sci.heat-transfer-conduction Calculator
Calculates steady-state heat flux through a planar wall using Fourier's law Q/A = kΔT/d and thermal resistance for layered walls. Thermal resistance R = d/(kA) — adding 10 cm of mineral wool insulation (k = 0.04 W/(m·K)) to a 1 m² wall gives R = 2.5 K/W.
Inputs
Thermal Conductivity
Reference formula or conversion factor shown for context.
Area M2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Thickness M
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
Temp Diff K
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Results
heat flux (W)
The value at the specified point or condition.
thermal resistance (K/W)
Opposition to heat flow (K/W). Higher = better insulation. Works like electrical resistance — resistances in series add, in parallel follow the reciprocal rule.
heat flux density (W/m²)
The value at the specified point or condition.
Fourier law: Q = kA∆T/L
Reference formula or conversion factor shown for context.