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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)