modelOutlinePackedBedStorage_L4
Extends from ClaRa.Basics.Icons.RecordIcon.
Information
1. Purpose of model
Outline of packed-bed thermal energy storage model. Includes the integration of power variables for energy-based analysis.
2. Level of detail, physical effects considered, and physical insight
(Description)
3. Limits of validity
(Description)
4. Interfaces
(none)
5. Nomenclature
(no elements)
6. Governing Equations
(no equations)
7. Remarks for Usage
(none)
8. Validation
(no validation or testing necessary)
9. References
(none)
10. Version History
Model created by Michael von der Heyde (heyde@tuhh.de) for the FES research project, March 2021
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Integer | N_cv | 10 | |Discretisation|Number of finite volumes |
| SI.Volume | volume_tot | Total packed bed volume | |
| SI.Length | length | Length of packed bed |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Temperature[N_cv] | T_bed | Packed-bed temperature | |
| SI.Temperature | T_air_hot | Hot air temperature | |
| SI.Temperature | T_air_cold | Cold air temperature | |
| SI.Temperature | T_air_bed_hot | Temperatur at packed bed inlet, hot side | |
| SI.Temperature | T_air_bed_cold | Temperatur at packed bed inlet, cold side | |
| SI.Temperature[N_cv] | T_start_bed | Packed-bed initial temperatures | |
| SI.Temperature | T_c | Nominal charge temperature | |
| SI.Temperature | T_d | Nominal discharge temperature | |
| SI.Temperature | T_stop_c | Stop Temperature Charge (for calculation of UCR) | |
| SI.Temperature | T_stop_d | Stop Temperature Discharge (for calculation of UCR) | |
| SI.Temperature | T_ref | Reference temperature | |
| SI.Power | E_flow | Enthalpy flux difference of storage | |
| SI.Power | E_flow_nom | nominal enthalpy flux difference | |
| SI.Power | Ex_flow | Exergy part of enthalpy flux difference of storage | |
| SI.Power | P_isentropicCompression | Power to compensate pressure loss in packed bed by isentropic compression | |
| SI.Pressure | Delta_p_hot | Pressure loss across hot side air volume | |
| SI.Pressure | Delta_p_cold | Pressure loss across cold side air volume | |
| SI.Pressure | Delta_p_bed | Pressure loss across packed bed | |
| SI.HeatFlowRate | Q_flow_loss_Iso_bed | Transmission heat loss through thermal insulation around packed bed | |
| SI.HeatFlowRate | Q_flow_loss_Iso_hot | Transmission heat loss through thermal insulation around hot air side | |
| SI.HeatFlowRate | Q_flow_loss_Iso_cold | Transmission heat loss through thermal insulation around cold air side | |
| SI.HeatFlowRate | Q_flow_loss_PB2hotAir | Heat loss through packed bed inlet at hot side | |
| SI.HeatFlowRate | Q_flow_loss_PB2coldAir | Heat loss through packed bed inlet at cold side | |
| SI.Volume[N_cv] | volume_rock | Rock volume in each control volume | |
| SI.DensityVolumeSpecific[N_cv] | d | Rock density in each control volume | |
| SI.Length[N_cv] | x_abs | Center position of each finite control volume | |
| Real[N_cv + 1] | Re | Reynolds number in packed bed | |
| SI.ThermalConductivity[N_cv] | lambda_eff_ax | Effective thermal conductivity of packed bed | |
| SI.CoefficientOfHeatTransfer[N_cv] | alpha_PB2Wall | Heat transfer coefficient packed bed 2 wall | |
| SI.CoefficientOfHeatTransfer | alpha_PB2Air_hot | Heat transfer coefficient packed bed 2 air hot side | |
| SI.CoefficientOfHeatTransfer | alpha_PB2Air_cold | Heat transfer coefficient packed bed 2 air cold side | |
| ClaRa.SimCenter | simCenter | ||
| SI.Energy | U_start | Internal energy at start | |
| SI.Energy | Ex_start | Exergy part of internal energy at start | |
| SI.Energy | U_stored | Currently stored internal energy | |
| SI.Energy | Ex_stored | Currently stored exergy part of internal energy | |
| SI.Energy | U_theo | Nominal/theoretical thermal storage capacity | |
| SI.Power | Q_flow_loss_Iso_tot | Total Heat Loss of Storage Through Insulation | |
| SI.Pressure | Delta_p_tot | Total Pressure Loss of Storage | |
| SI.Energy | E_to_storage | ||
| SI.Energy | E_from_storage | ||
| SI.Energy | Ex_to_storage | ||
| SI.Energy | Ex_from_storage | ||
| SI.Energy | W_isentropicCompression | ||
| SI.Energy | Q_loss_Iso_tot | ||
| Real | SOC | State of charge | |
| SI.Mass | m_rock_tot | total storage material mass | |
| SI.EnthalpyVolumeSpecific | energyDensity | volumetric energy density of storage | |
| Real | DoC | current depth of charge (changes when charge stop criterium is violated) | |
| Real | DoD | current depth of discharge (changes when discharge stop criterium is violated) | |
| Real | UCR | Usable capacity ratio | |
| Real | DoC_mean | mean depth of charge when reaching Charging Temperature stopping criteria | |
| Real | DoD_mean | mean depth of discharge when reaching Discharging Temperature stopping criteria | |
| Real | UCR_mean | Mean usable capacity ratio in observation time period | |
| Real | equivalentFullCycles | number of equivalent full cycles | |
| Real | load | load of storage, relataive to the nominal load | |
| Real | relHeatLoss | relative transmission heat loss of storage unit | |
| Real | relExergyLoss | relative exergy loss of storage unit | |
| Real | relIsentropicCompressionWork | relative isentropic compression work to compensate pressure loss in storage | |
| Real | storedEnergyDeviation | difference in stored energy in storage unit over observation period | |
| Real | storedExergyDeviation | difference in stored exergy in storage unit over observation period | |
| SI.Energy | E_check | energy residuum to verify energy balance |
Contents
| Name | Description |
|---|---|
| medium_rock |