modelElectrolyzerAndCavern

Information

1. Purpose of model

This simple model simulates the behavior of a hydrogen cavern. It should be used together with the component TransiEnt.Producer.Combined.LargeScaleCHP.H2CofiringCHP.

The default parameters are based on the sample cavern of one of the NOW studies [1].

2. Level of detail, physical effects considered, and physical insight

Loading:

• This component takes into consideration the amount of power being sent to the electrolyzer to calculate the produced amount of hydrogen.
• The cavern ist loaded as long as there is enough unused capacitiy in the cavern.
• The efficiency of the electrolyzer is constant and in regard to the lower heating value (NCV).

Unloading:

• Hydrogen is unloaded from the cavern if there is enough hydrogen in the cavern (more than the cushion-gas) and if there is hydrogen demand.
• The amount of hydrogen to be unloaded depends on the co-firing ration as defined in SimCenter.k_H2_fraction.

3. Limits of validity

Due to its simplifcation level, this model should not be used for detailed dimensioning of underground hydrogen caverns.

Its usage is rather recommended for large system models.

4. Interfaces

Inputs:

• P_ely_set
• Q_flow_fuel_GuD

Outputs:

• h2Available (boolean)

5. Nomenclature

Electrolyzer Parameters:

• P_nom_ely: nominal electric power of electrolyzer
• eta_nom_ely: nominal efficiency of electrolyzer

Cavern Parameters:

• medium: gas stored in the cavern (used for calculating the density)
• V_cavern: cavern geometric volume (converted into mass via calculated density)
• V_cushion: cushion gas volume (converted into mass via calculated density)
• k_H2_fraction: co-firing ratio (Q_flow_fuel_H2/Q_flow_fuel_CH4)

6. Governing Equations

(no equations)

7. Remarks for Usage

(none)

8. Validation

See Check-Model "TransiEnt.Producer.Gas.Electrolyzer.Systems.Check.TestElectrolyzerAndCavern"

9. References

[1] Stolzenburg, Klaus ; Hamelmann, Roland ; Wietschel, Martin ; Genoese, Fabio ; Michaelis, Julia ; Lehmann, Jochen ; Miege, Andreas ; Krause, Stephan ; Sponholz, Christian ; u. a.: Integration von Wind-Wasserstoff-Systemen in das Energiesystem Abschlussbericht, 2014

10. Version History

Ricardo Peniche, 2016

Sources:

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