λ = 0.022 W/m·K at mean temperature ((200+20)/2 = 110 °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 | 23 | 18 | 14 | 13 | 189 | 24 °C | €83 | 0.31 |
| DN50 | 35 | 25 | 19 | 17 | 341 | 25 °C | €154 | 0.56 |
| DN80 | 46 | 32 | 24 | 21 | 503 | 25 °C | €229 | 0.84 |
| DN100 | 56 | 39 | 28 | 24 | 646 | 26 °C | €296 | 1.08 |
| DN150 | 77 | 52 | 37 | 32 | 952 | 26 °C | €439 | 1.61 |
| DN200 | 97 | 64 | 45 | 38 | 1,239 | 26 °C | €573 | 2.10 |
| DN300 | 138 | 90 | 61 | 51 | 1,832 | 27 °C | €850 | 3.11 |
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 1,800 W/m² → 77 W/m² at 50 mm (≈€841/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) | 0.048 | 80 | 32 °C | €276 | 1.0 |
| Glass wool | 0.046 | 77 | 31 °C | €278 | 1.0 |
| Ceramic fibre (RCF / AES blanket) | 0.060 | 99 | 35 °C | €267 | 1.0 |
| Aerogel blanket | 0.026 | 45 | 27 °C | €294 | 1.1 |
| Calcium silicate | 0.063 | 104 | 35 °C | €265 | 1.0 |
| Expanded perlite | 0.066 | 109 | 36 °C | €262 | 1.0 |
| Cellular glass | 0.054 | 89 | 33 °C | €272 | 1.0 |
| Microporous (fumed-silica) panels | 0.022 | 39 | 26 °C | €296 | 1.1 |
| E-glass needle mat | 0.046 | 78 | 32 °C | €277 | 1.0 |
| Silica needle mat / fabric | 0.055 | 91 | 34 °C | €271 | 1.0 |
DN100 pipe at 200 °C, 50 mm insulation, per metre of pipe; bare loss 646 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 →
