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Table 1 Experimental results for different inlet temperatures
From: Experimental study on convective heat transfer of an open-loop borehole heat exchanger
Inlet temperature (°C) | Re | Flow mode | Sandbox temperature (°C) | Outlet temperature (°C) | Heat exchange rate (W) | Nu |
|---|---|---|---|---|---|---|
10 | 1975 | Forward | 55 | 14.4 | 1547.7 | 9.7 |
14 | 1975 | Forward | 55 | 17.4 | 1176.1 | 8.0 |
16 | 1975 | Forward | 55 | 19.1 | 1074.1 | 7.7 |
18 | 1975 | Forward | 55 | 20.5 | 868.2 | 6.5 |
20 | 1975 | Forward | 55 | 22.2 | 765.4 | 6.0 |
10 | 2633 | Forward | 55 | 12.8 | 1300.1 | 8.0 |
14 | 2633 | Forward | 55 | 16.5 | 1144.9 | 7.7 |
16 | 2633 | Forward | 55 | 19.2 | 1462.3 | 10.5 |
18 | 2633 | Forward | 55 | 21.3 | 1515.1 | 11.5 |
20 | 2633 | Forward | 55 | 23.2 | 1488.4 | 11.9 |
12 | 1975 | Backward | 55 | 37.3 | 8817.0 | 77.7 |
14 | 1975 | Backward | 55 | 39.1 | 8738.5 | 82.1 |
16 | 1975 | Backward | 55 | 39.5 | 8158.2 | 80.0 |
18 | 1975 | Backward | 55 | 40.0 | 7658.5 | 78.8 |
20 | 1975 | Backward | 55 | 40.2 | 7020.0 | 75.4 |