Assumptions for tunnel heat transfer coefficient calculations
| Parameter | Mudstone or glacial till | Sherwood sandstone | Sandstone with moderate groundwater flow | Mudstone or sandstone with higher tunnel airflow |
|---|---|---|---|---|
| Ground conductivity: W/mK | 2 | 3 | 3 | 2–3 |
| Groundwater flow: m/day | 0 | 0 | 0.5 | 0 |
| Tunnel air temperature: °C | ||||
| Dornberger et al. (2022) | 25 | 25 | 25 | 25 |
| Di Donna and Barla (2016) | 21 | 21 | 21 | 21 |
| Tunnel internal heat transfer coefficient: W/m2.K | 5 | 5 | 5 | 20 |
| Parameter | Mudstone or glacial till | Sherwood sandstone | Sandstone with moderate groundwater flow | Mudstone or sandstone with higher tunnel airflow |
|---|---|---|---|---|
| Ground conductivity: W/mK | 2 | 3 | 3 | 2–3 |
| Groundwater flow: m/day | 0 | 0 | 0.5 | 0 |
| Tunnel air temperature: °C | ||||
| | 25 | 25 | 25 | 25 |
| | 21 | 21 | 21 | 21 |
| Tunnel internal heat transfer coefficient: W/m2.K | 5 | 5 | 5 | 20 |
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