Table 4 Comparison of heat transfer rate for seven working condition double-U pipe
From: Heat transfer analysis of underground U-type heat exchanger of ground source heat pump system
S/De | ΔT (K) | Qi (kw) | (Q∞ − Qi)/Qi (%) |
|---|---|---|---|
2.5 | 2.4 | 5.64 | 90.66 |
3 | 2.54 | 5.97 | 80.14 |
4 | 2.81 | 6.6 | 62.83 |
4.5 | 2.944 | 6.92 | 55.42 |
5 | 3.1 | 7.28 | 47.6 |
5.5 | 3.23 | 7.59 | 41.66 |