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Different arrangements and configurations of the spiral GHEs.
| Case | GHE pipe length |
Spiral turn number |
Outlet pipe position | |||
|---|---|---|---|---|---|---|
| L1 = L2 = L3 = L4 (m) | N1 | N2 | N3 | N4 | ||
| Case1 | 5 | 25 | 25 | 25 | 25 | Inside spiral |
| Case 2 | 5 | 20 | 20 | 30 | 30 | Inside spiral |
| Case 3 | 5 | 11 | 17 | 27 | 45 | Inside spiral |
| Case 4 | 5 | 25 | 25 | 25 | 25 | Outside spiral |
| Case 5 | 5 | 11 | 17 | 27 | 45 | Outside spiral |
| Case 6 | 5 | 50 | 50 | 50 | 50 | Inside spiral |
