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Table 6 Parameter changes investigated in the DBHE model

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

Parameters Values Description Base case
\({\dot{m}}\) (kg/s) 3-5-7-9   5
Inner casing properties
 Casg1 \(\lambda\) (W/mK) 0.01038 Insulateda  
1.163 Moritab 0.01038
2.5   
46.1 Moritac  
Outer casing properties
 Casg2-3 \(\lambda\) (W/mK) 46.1 Moritab  
45.0 Weissbadd 46.1
15.0 Newberrye  
0.01038 Insulateda  
Cement properties
 Ceme1-2 \(\lambda\) (W/mK) 0.99 Moritac  
2.24 REF concretef 0.99
3.52 GRAP concretef  
300 Graphite flakesa  
Radii
 Annulus radii \(r_{\text{i}}/r_{\text{o}}\) (m) 0.0797/0.0889 Morita  
0.0629/0.0721 Case1  
0.1061/0.1153 Case2 0.0797/0.0889
0.0797/0.0889 Case3  
0.0797/0.0889 Case4  
 Tubing radii \(r_{\text{i}}/r_{\text{o}}\) (m) 0.0253/0.0445 Morita  
0.0253/0.0445 Case1  
0.0253/0.0445 Case2 0.0253/0.0445
0.0336/0.0528 Case3  
0.0173/0.0365 Case4  
  1. aInsulated inner casing 0.01038 W/mK, cited from Falcone et al. (2018)
  2. bThermal conductivity values quoted from Morita et al. (1985)
  3. cThermal conductivity values quoted from Morita et al. (1992a)
  4. dWeissbad parameters quoted from Kohl et al. (2000)
  5. eNewberry parameters quoted from Cladouhos (2012)
  6. fCement parameters obtained from Asadi et al. (2018)