λ = 0.025 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 | 70 | 53 | 43 | 39 | 504 | 33 °C | €220 | 0.80 |
| DN50 | 104 | 75 | 58 | 51 | 909 | 35 °C | €407 | 1.49 |
| DN80 | 138 | 97 | 72 | 64 | 1,341 | 36 °C | €606 | 2.22 |
| DN100 | 169 | 117 | 85 | 74 | 1,724 | 37 °C | €784 | 2.87 |
| DN150 | 232 | 157 | 111 | 95 | 2,538 | 39 °C | €1,162 | 4.25 |
| DN200 | 292 | 194 | 135 | 115 | 3,304 | 39 °C | €1,517 | 5.55 |
| DN300 | 415 | 271 | 185 | 155 | 4,884 | 40 °C | €2,251 | 8.24 |
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 → 230 W/m² at 50 mm (≈€2,229/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: Microporous (fumed-silica) panels → · temperature class: by temperature →
