Research Article
The Fracture Influence on the Energy Loss of Compressed Air Energy Storage in Hard Rock
Table 1
Material parameters used in example.
| | Parameters | Value in cavern | Value in formation |
| | Young’s modulus (GPa) | — | 35 |
| | Poisson’s ratio | — | 0.3 |
| | Density (kg/m3) | Determined by and | 2800 |
| | Pore ratio | 1.0 | 0.01 |
| | Permeability coefficient (m2) | | |
| | Permeability coefficient along crack (m2) | — | |
| | Crack width () | — | 0.1 |
| | Viscosity of air (Pa⋅s) | | |
| | Biot’s consolidation coefficient | 0.95 | 0.95 |
| | Heat conduction of rock (W/m⋅K) | 3 | 3 |
| | Heat conduction of air (W/m⋅K) | 1000 | 0.56 |
| | Specific heat of air under constant pressure (J/kg⋅K) | 1000 | 1000 |
| | Specific heat of rock (J/kg⋅K) | 900 | 900 |
| | Expansion coefficient (1/K) | | |
| | Initial pressure (atm) | 1 | 1 |
| | Initial temperature (K) | 286.15 | 286.15 |
| | Air injection temperature (K) | 296.65 | — |
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