Modelling an unconventional closed-loop deep borehole heat exchanger (DBHE): sensitivity analysis on the Newberry volcanic setting

Geothermal Energy

Science – Society – Technology

Table 5 Key borehole properties in support of Fig. 2 (right)

Key	Borehole section	Name of section	Thermodynamic properties
A.	Insulated inner pipe	Casg1	\(\rho = 2700 {\text{ kg}/{\text{m}}}^{3}\) \(c_{\text{P}} = 470\,{\text{J}/{\text{kg}}}\,^{\circ }\text {C}\) \(\varPhi =\) 0 (0\(\%\)) \(K =\) 0 \(\text {m}^{2}\) \(\lambda =\) 0.01038 W/mK^a
B./C.	Casing	Casg2/Casg3	\(\rho = 2700\, {\text{kg}/{\text{m}}}^{3}\) \(c_{\text{P}} = 470\, {\text{J}/{\text{kg}}}\,^{\circ }\text {C}\) \(\varPhi =\) 0 (0\(\%\)) \(K = 0\text { m}^{2}\) \(\lambda = 46.1 \, {\text{W}/{\text{mK}}}\)
D./E.	Cement	Ceme1/Ceme2	\(\rho = 1830\, {\text{kg}/{\text{m}}}^{3}\) \(c_{\text{P}} = 1900\, {\text{J}/{\text{kg}}}\,^{\circ }\text {C}\) \(\varPhi =\) 0 (0\(\%\)) \(K = 0\text { m}^{2}\) \(\lambda = 0.99 \, {\text{W}/{\text{mK}}}\)

^aInsulated inner casing, sourced from Falcone et al. (2018). Other parameters sourced from Morita et al. (1992a)