Furnace Wall Conductive Heat Loss Calculator

Furnace Wall Conductive Heat Loss Calculator

Refractory walls are not perfect insulators - some heat always conducts through to the outside, following the same basic law that governs heat conduction through any material.

The Formula

Q = (k × A × ΔT) / L

Worked Example

A refractory with 0.15 W/mK conductivity, 10 m² area, 800K temperature difference, 200mm thick: Q = (0.15 × 10 × 800) / 0.2 = 6,000 W = 6 kW.

How to Use This Calculator

1. Enter the refractory material's thermal conductivity.
2. Enter the wall's exposed area.
3. Enter the temperature difference across the wall.
4. Enter wall thickness in mm.

Doubling wall thickness halves this heat loss - which is exactly the trade-off refractory design balances against material cost and internal furnace volume.