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Geothermal Energy

Science – Society – Technology

Table 2 Physical parameters of formations

From: Operational strategies to alleviate thermal impacts of the large-scale borehole heat exchanger array in Beijing Daxing Airport

Rock type

Specific heat capacity (kJ/kg·K)

Porosity

Density (kg/m3)

The water content

Vad.

Sat.

Vad.

Sat.

Vad.

Sat.

Vad.

Sat.

Clay

1.30

1.38

0.47

0.47

1.9 × 103

1.95 × 103

0.23

0.28

Slit

1.40

1.40

0.40

0.40

1.88 × 103

1.92 × 103

0.18

0.20

Medium sand

1.05

1.05

0.35

0.35

1.95 × 103

1.95 × 103

0.16

0.18

Grit/Coarse sand

1.05

1.05

0.38

0.38

1.95 × 103

1.95 × 103

0.14

0.20

  1. Vad. represents Vadose zone, Sat. represents saturated zone
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