λ = 0.083 W/m·K at mean temperature ((500+20)/2 = 260 °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 | 208 | 167 | 137 | 125 | 504 | 60 °C | €164 | 0.60 |
| DN50 | 303 | 233 | 183 | 165 | 909 | 66 °C | €330 | 1.21 |
| DN80 | 401 | 299 | 229 | 203 | 1,341 | 70 °C | €508 | 1.86 |
| DN100 | 486 | 356 | 269 | 236 | 1,724 | 73 °C | €667 | 2.44 |
| DN150 | 665 | 476 | 350 | 304 | 2,538 | 76 °C | €1,006 | 3.68 |
| DN200 | 833 | 587 | 425 | 365 | 3,304 | 79 °C | €1,325 | 4.85 |
| DN300 | 1,179 | 816 | 577 | 491 | 4,884 | 81 °C | €1,985 | 7.26 |
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 4,800 W/m² → 686 W/m² at 50 mm (≈€2,007/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) | 0.079 | 339 | 70 °C | €675 | 2.5 |
| Ceramic fibre (RCF / AES blanket) | 0.069 | 300 | 65 °C | €694 | 2.5 |
| Aerogel blanket | 0.038 | 173 | 46 °C | €757 | 2.8 |
| Calcium silicate | 0.083 | 356 | 73 °C | €667 | 2.4 |
| Expanded perlite | 0.086 | 367 | 75 °C | €662 | 2.4 |
| Microporous (fumed-silica) panels | 0.025 | 117 | 37 °C | €784 | 2.9 |
| E-glass needle mat | 0.068 | 297 | 64 °C | €696 | 2.5 |
| Silica needle mat / fabric | 0.062 | 274 | 61 °C | €707 | 2.6 |
DN100 pipe at 500 °C, 50 mm insulation, per metre of pipe; bare loss 1,724 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: Calcium silicate → · temperature class: by temperature →
