High-Temperature Insulation: Heat Loss & Savings
Above ~300 °C, bare surfaces lose heat extremely fast — radiation dominates and loss climbs with the fourth power of temperature. High-temperature removable insulation (100 mm Wired mineral-wool here) cuts it by 96–98% and still holds the outer surface ≤50 °C.
Heat loss vs insulated — by surface temperature
| Surface temp | Bare loss | Insulated | Outer surface | Reduction |
|---|---|---|---|---|
| 300 °C | 8,075 W/m² | 204 W/m² | 34 °C | 97.5% |
| 400 °C | 14,273 W/m² | 321 W/m² | 41 °C | 97.8% |
| 500 °C | 23,410 W/m² | 461 W/m² | 50 °C | 98.0% |
| 600 °C | 36,423 W/m² | 624 W/m² | 60 °C | 98.3% |
Per-m² flat-surface flux, ASTM C680 / ISO 12241, 50 mm Lamella (≤220 °C) or 100 mm Wired mat (>220 °C), 20 °C ambient. Multiply by the bare area.
Worked examples (per year, 8,000 h, natural gas)
| Item | Heat saved | Energy/yr | CO₂/yr | € saved/yr |
|---|---|---|---|---|
| 1 m² of 450 °c surface (1.0 m², 450 °C) | 18.0 kW | 170 MWh | 34.3 t | €9,843 |
| 1 m² of 600 °c surface (1.0 m², 600 °C) | 35.8 kW | 337 MWh | 68.1 t | €19,542 |
FAQ
How much heat does a bare high-temperature lose?
At 20 °C ambient (ASTM C680): 1 m² of 450 °C surface (~1.0 m², 450 °C) loses about 18.0 kW; 1 m² of 600 °C surface (~1.0 m², 600 °C) about 35.8 kW. Insulating 1 m² of 450 °C surface saves ≈170 MWh and ≈34.3 t CO₂ per year (8,000 h).
Can you insulate superheater lines and similar?
Yes. High-temperature equipment must be inspected for hot spots and expansion. Removable high-temp jackets allow that while covering the surface. Inzonex covers superheater lines, furnace doors, exhausts, kilns and high-pressure steam fittings. The outer surface drops to a touch-safe ≤45 °C and the part stays serviceable.
How much does high-temperature insulation save?
Each item saves 96–98% of its bare loss. 1 m² of 450 °c surface at 450 °C saves ≈9,843 €/yr of energy (≈170 MWh, ≈34.3 t CO₂) at typical gas prices; payback is usually under two years.
What insulation thickness is used?
Up to 220 °C surface: 50 mm mineral-wool (Lamella); above 220 °C: 100 mm (Wired mat), because conductivity rises with temperature. Both keep the outer surface ≤45 °C.