λ = 0.082 W/m·K at mean temperature ((800+20)/2 = 410 °C, from the published curve). Pipe losses per metre, four thicknesses, savings vs bare.
| Pipe | 30 mm W/m | 50 mm W/m | 80 mm W/m | 100 mm W/m | BARE W/m | Surface @50 mm | Saving €/m·yr @50 mm | t CO2/m·yr |
|---|---|---|---|---|---|---|---|---|
| DN25 | 332 | 265 | 217 | 198 | 818 | 83 °C | €270 | 0.99 |
| DN50 | 483 | 370 | 292 | 262 | 1,478 | 93 °C | €540 | 1.98 |
| DN80 | 639 | 476 | 365 | 323 | 2,178 | 100 °C | €831 | 3.04 |
| DN100 | 775 | 567 | 427 | 376 | 2,801 | 104 °C | €1,090 | 3.99 |
| DN150 | 1,061 | 758 | 556 | 483 | 4,124 | 110 °C | €1,642 | 6.01 |
| DN200 | 1,329 | 935 | 676 | 581 | 5,369 | 113 °C | €2,163 | 7.92 |
| DN300 | 1,880 | 1,299 | 918 | 780 | 7,937 | 118 °C | €3,238 | 11.85 |
Assumptions: 20 °C ambient, still air (h=10 W/m²·K combined), €0.05/kWh fuel, 8000 h/yr, 82% efficiency, 0.183 kg CO2e/kWh (DESNZ 2024). Flat surfaces at this duty: bare 7,800 W/m² → 1,093 W/m² at 50 mm (≈€3,272/m²·yr saved). Method: ASTM C680 simplified — methodology. Your exact case: free calculator.
| Material | λ W/m·K | Loss W/m | Surface | Saving €/m·yr | t CO2/m·yr |
|---|---|---|---|---|---|
| Ceramic fibre (RCF / AES blanket) | 0.093 | 637 | 115 °C | €1,055 | 3.9 |
| Microporous (fumed-silica) panels | 0.028 | 212 | 51 °C | €1,263 | 4.6 |
| Silica needle mat / fabric | 0.082 | 567 | 104 °C | €1,090 | 4.0 |
DN100 pipe at 800 °C, 50 mm insulation, per metre of pipe; bare loss 2,801 W/m. λ at mean temperature; € and CO2 per metre·year at €0.05/kWh, 8000 h, 82% efficiency. Method: ASTM C680 simplified (h=10).
Material datasheet: Silica needle mat / fabric → · temperature class: by temperature →
