λ = 0.067 W/m·K at mean temperature ((400+20)/2 = 210 °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 | 136 | 107 | 87 | 79 | 399 | 46 °C | €142 | 0.52 |
| DN50 | 198 | 150 | 117 | 105 | 720 | 50 °C | €278 | 1.02 |
| DN80 | 262 | 193 | 147 | 130 | 1,061 | 52 °C | €424 | 1.55 |
| DN100 | 319 | 230 | 172 | 151 | 1,365 | 54 °C | €553 | 2.03 |
| DN150 | 437 | 308 | 224 | 194 | 2,009 | 57 °C | €830 | 3.04 |
| DN200 | 548 | 380 | 272 | 233 | 2,616 | 58 °C | €1,090 | 3.99 |
| DN300 | 776 | 528 | 370 | 314 | 3,867 | 60 °C | €1,628 | 5.96 |
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 3,800 W/m² → 446 W/m² at 50 mm (≈€1,636/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 |
|---|---|---|---|---|---|
| Stone wool (mineral wool) | 0.067 | 230 | 54 °C | €553 | 2.0 |
| Glass wool | 0.064 | 223 | 53 °C | €557 | 2.0 |
| Ceramic fibre (RCF / AES blanket) | 0.061 | 214 | 52 °C | €561 | 2.1 |
| Aerogel blanket | 0.033 | 119 | 38 °C | €607 | 2.2 |
| Calcium silicate | 0.076 | 261 | 59 °C | €538 | 2.0 |
| Expanded perlite | 0.079 | 270 | 60 °C | €534 | 2.0 |
| Cellular glass | 0.068 | 235 | 55 °C | €551 | 2.0 |
| Microporous (fumed-silica) panels | 0.024 | 89 | 33 °C | €622 | 2.3 |
| E-glass needle mat | 0.060 | 208 | 51 °C | €564 | 2.1 |
| Silica needle mat / fabric | 0.056 | 197 | 49 °C | €569 | 2.1 |
DN100 pipe at 400 °C, 50 mm insulation, per metre of pipe; bare loss 1,365 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: Stone wool (mineral wool) → · temperature class: by temperature →
