This hub is a computed reference, and computed references owe you their assumptions. Here they all are.
Cylindrical (pipes): bare Q/L = h·π·D·ΔT; insulated Q/L = ΔT / [ ln(r₂/r₁)/(2πk) + 1/(h·π·D₂) ]; surface temperature T_s = T_amb + Q·R_surf. Flat: q = ΔT/(t/k + 1/h). Combined outer coefficient h = 10 W/m²·K — the still-air convection+radiation value used by the public calculator; wind raises it (and bare losses) substantially, so outdoor bare components waste MORE than these tables show.
Conductivity is interpolated linearly within each Inzonex generic material-class curve at T_mean=(T_hot+20)/2. This is the single most common error in insulation arithmetic done by hand — ambient λ understates hot-service λ by 2–3× for fibrous materials.
Generic class tables use Inzonex screening curves, not a declared curve for a specific product. Each material-temperature table lists the curve points and interpolation limits used in its calculation. The separate product source library records manufacturer, grade, test method, geometry and source-temperature wording. Product source rows are not automatically used by the generic calculator. Worked class-model tables: stone wool at 200 °C and aerogel at 200 °C. These use the stated screening assumptions, not a product specification.
| Assumption | Value | Note |
|---|---|---|
| Fuel price | €0.05/kWh | illustrative; restate with your contract price |
| Operating hours | 8000 h/yr | continuous process typical |
| Boiler efficiency | 82% | fuel saved = heat saved ÷ efficiency |
| Emission factor | 0.183 kg CO2e/kWh | natural gas, UK DESNZ 2024 |
| Carbon price | €80.01/t | EU ETS, updated via the Carbon Hub live feed |
Not a design calculation to contract: no wind, orientation or emissivity iteration, no product-specific λD, no tolerance stack. For that, run full C680/ISO 12241 with project conditions — or start from the free calculator, which exposes all inputs.
