Table 5.

Variation of COP improvement criterion for different GHE configurations.

Case	Qcase1 = QH (W/m)	QH−C (W/m)	${\mathit{Q}}_{\mathit{H}}^{\prime }$ (W/m)	V (m3/s)<	ΔPcase1 = ΔP (Pa/m)	ΔPc (Pa/m)	$\mathbf{\Delta }{\mathit{P}}^{\prime }$ (Pa/m)	COPimprvt criterion from Eq (13)
Case 2	23.61	22.9265	−0.6835	3.33 × 10−5	24.026	24.539	0.513	−0.029
Case 3	23.61	22.7475	−0.8625	3.33 × 10−5	24.026	25.4335	1.4075	−0.037
Case 4	23.61	25.3795	1.7695	3.33 × 10−5	24.026	23.973	−0.053	0.075
Case 5	23.61	25.4215	1.8115	3.33 × 10−5	24.026	24.769	0.743	0.077
Case 6	23.61	26.2595	2.6495	3.33 × 10−5	24.026	39.6415	15.6155	0.112