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Table 2.
Main parameter values used in computations [10].
| Input boundary conditions | |
|---|---|
| T i = 573 K | Initial bed temperature |
| T f = 300 K | Cold fluid temperature |
| P i = 1 MPa | Supply pressure |
| h = 103 W/m2 K | Heat transfer coefficient |
Properties of metal alloy |
|
| ρ m = 1945 kg/m3 | Metal density |
| Cp MH = 1545 J/kg K | Specific heat of metal |
| λ eff = 0.48 W/m K | Effective thermal conductivity |
| ε = 0.77 | Porosity |
| E a = 130 kJ/mol H2 | Activation energy |
| ΔS = 135.6 J/mol H2 K | Entropy of formation |
| ΔH = 75 kJ/mol H2 | Enthalpy of formation |
Properties of hydrogen |
|
| λ g = 0.127 W/m K | Thermal conductivity of hydrogen |
| Cp g = 14 283 J/kg K | Specific heat of hydrogen |
| ρ g = 0.0838 kg/m3 | Hydrogen density |
Constants |
|
| R = 8.314 J/mol K | Universal gas constant |
| k c = 1011 s−1 | Reaction constant |
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