How to Use Thermal Conductivity Calculator
The Thermal Conductivity Calculator solves one-dimensional, steady-state heat conduction through a flat slab. Enter the material’s k, the slab area, thickness, and temperature difference, and the Thermal Conductivity Calculator returns the conductive heat-transfer rate Q in watts.
- Enter thermal conductivity k — Typical values: copper 401 W/(m·K), aluminum 237, glass 1.0, fiberglass insulation 0.04.
- Enter area A and thickness L — Provide the cross-sectional area perpendicular to heat flow and the slab thickness.
- Enter temperature difference ΔT — Hot side minus cold side, in K or °C (equivalent for differences).
- Read the result — Q is given in watts (and kW for convenience).
Formula & Theory — Thermal Conductivity Calculator
The Thermal Conductivity Calculator is based on Fourier’s law of conduction:
Q = k · A · ΔT / L| Symbol | Meaning |
|---|---|
| Q | Conductive heat flow rate (W) |
| k | Thermal conductivity W/(m·K) |
| A | Cross-section area (m²) |
| ΔT | Temperature difference (K) |
| L | Conduction path length / slab thickness (m) |
Assumptions and Limits
The Thermal Conductivity Calculator assumes one-dimensional steady-state conduction through a homogeneous slab. Convection and radiation are not included; for composite walls, calculate each layer’s resistance R = L/(k·A) and sum them.
Use Cases for Thermal Conductivity Calculator
- Building insulation — Compare insulation materials and meet energy-code targets.
- Electronics cooling — Size heat-sink bases and thermal interfaces.
- Industrial pipework — Estimate heat loss through pipe-wall thicknesses.
- Education — Demonstrate Fourier’s law with quick, transparent numbers.
The Thermal Conductivity Calculator delivers immediate, code-friendly heat-loss estimates.