modelPartialGasStorage_L2

Partial model of a simple gas storage volume for real gases

Extends from TransiEnt.Storage.Gas.Base.PartialGasStorage.

Information

1. Purpose of model

This model represents a compressed gas storage for real gases.

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

The model consists of a volume, in which the gas located. Pressure losses inside the volume and during charging and discharging are neglected. There is no discretisation of the flow field or the heat transfer. The heat transfer is modelled using a replacable heat transfer model, the default model uses a constant heat transfer coefficient.

3. Limits of validity

The model is only valid for negligible pressure losses and negligible changes of the heat transfer coefficient (other heat transfer models can be used). For high pressures there are errors due to errors in the gas models.

4. Interfaces

gasPortIn and gasPortOut: Real gas input and output

heat: heat port for the heat flow into/out of the storage

p_storage: signal output of the gas pressure

5. Nomenclature

(no elements)

6. Governing Equations

Simple mass and energy balances are used.

7. Remarks for Usage

(no remarks)

8. Validation

No validation necessary because only fundamental equations are used.

9. References

(no remarks)

10. Version History

Model created by Carsten Bode (c.bode@tuhh.de) on Wed Oct 07 2015

Model revised by Carsten Bode (c.bode@tuhh.de) in Apr 2018 (changes due to ClaRa changes: changed parameters)

Parameters

TypeNameDefaultDescription
SI.SpecificEnthalpyNCV (from PartialGasStorage)TransiEnt.Basics.Functions.GasProperties.getRealGasNCVVector(medium, medium.nc)NCV of gas components
SI.SpecificEnthalpyGCV (from PartialGasStorage)TransiEnt.Basics.Functions.GasProperties.getRealGasGCVVector(medium, medium.nc)GCV of gas component
SI.Diameterdiametersqrt(4*V_geo/(pi*height))Diameter of storage
SI.AreaA_heatpi/2*diameter^2 + pi*diameter*heightSurface area of storage
Fundamental Definitions
TILMedia.VLEFluidTypes.BaseVLEFluidmedium (from PartialGasStorage)simCenter.gasModel1Medium in the gas storage
BooleanincludeHeatTransfer (from PartialGasStorage)trueconsider heat transfer
Geometry
SI.VolumeV_geo (from PartialGasStorage)1geometric inner volume of the storage cylinder
SI.Heightheight3.779*V_geo^(1/3)Height of storage
Initialization
SI.Massm_gas_start (from PartialGasStorage)1e5Initial mass in the storage
Booleanstart_pressuretruetrue if a start pressure is defined, false if a start mass is defined
SI.Pressurep_gas_start1e5pressure in storage at t=0
SI.ThermodynamicTemperatureT_gas_start283.15Temperature of gas in storage at t=0
Statistics
BooleancalculateCost (from PartialGasStorage)simCenter.calculateCosttrue if cost shall be calculated

Connectors

TypeNameDefaultDescription
TransiEnt.Basics.Interfaces.Gas.RealGasPortIngasPortIn (from PartialGasStorage)
TransiEnt.Basics.Interfaces.Gas.RealGasPortOutgasPortOut (from PartialGasStorage)
TransiEnt.Basics.Interfaces.General.PressureOutp_gas (from PartialGasStorage)
Modelica.Thermal.HeatTransfer.Interfaces.HeatPort_aheat (from PartialGasStorage)

Components

TypeNameDefaultDescription
TransiEnt.SimCentersimCenter (from PartialGasStorage)
TransiEnt.ModelStatisticsmodelStatistics (from PartialGasStorage)
SI.Massm_gas (from PartialGasStorage)Gas mass
SI.MassFraction[medium.nc - 1]xi_gas (from PartialGasStorage)Gas composition
SI.EnergyFlowRateH_flow_in_NCV (from PartialGasStorage)Inflowing enthalpy flow based on NCV
SI.EnergyFlowRateH_flow_out_NCV (from PartialGasStorage)Inflowing enthalpy flow based on NCV
SI.EnthalpyH_gas_NCV (from PartialGasStorage)Enthalpy of the gas bulk based on NCV
SI.EnergyFlowRateH_flow_in_GCV (from PartialGasStorage)Inflowing enthalpy flow based on GCV
SI.EnergyFlowRateH_flow_out_GCV (from PartialGasStorage)Inflowing enthalpy flow based on GCV
SI.EnthalpyH_gas_GCV (from PartialGasStorage)Enthalpy of the gas bulk based on GCV
HeatTransferheatTransfer

Contents

NameDescription
HeatTransfer