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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