modelMaxH2MassFlow_phi

Model for calculation of maximum admissible mass flow rate of hydrogen from specified volumetric percentage at STP
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Extends from TransiEnt.Basics.Icons.Sensor (Icon representing a round measurement device).

Information

1. Purpose of model

Model for determination of permitted maximum additional hydrogen mass flow in analyzed natural gas flow.

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

3. Limits of validity

4. Interfaces

  • Two inputs: gas inlet and gas outlet
  • One output: signal output of maximum permitted hydrogen mass flow

5. Nomenclature

  • phi: volume fraction
  • xi: weight fraction
  • STP: standard temperature and pressure (Tstp=273.15 K, pstp=1.01325 bar)
  • NG: gas mixture before feedin
  • NGH2: gas mixture after feedin
  • H2inNG: hydrogen in gas mixture before feedin

6. Governing Equations

Isenthalpic, no chemical reactions, no pressure losses, conservation of mass.

Mass balances for feedin point:

m_flow_NGH2max=m_flow_H2max+m_flow_NG

xi_H2max*m_flow_NGH2max=m_flow_H2max+xi_H2*m_flow_NG

The same for volume balances plus the relation between mass and volume:

V_flow_stp=m_flow/rho_stp

gives the stated relations.

7. Remarks for Usage

Hydrogen has to be the last entry of medium column vector.

8. Validation

Tested in check model "TransiEnt.Consumer.Gas.Check.GasDemandVarH2_varGCV_controlMFlow"

9. References

10. Version History

Model created by Christopher Helbig, Dec 2014

Model edited and revised by by Lisa Andresen (andresen@tuhh.de), Jul 2016

Parameters

TypeNameDefaultDescription
TILMedia.VLEFluidTypes.BaseVLEFluidmediumsimCenter.gasModel1Medium to be used
Modelica.Units.SI.VolumeFractionphi_H2maxsimCenter.phi_H2maxMaximum admissible volume fraction of H2 in NGH2 at STP

Connectors

TypeNameDefaultDescription
TransiEnt.Basics.Interfaces.General.MassFlowRateOutm_flow_H2_maxMaximum admissible hydrogen production rate
TransiEnt.Basics.Interfaces.Gas.RealGasPortIngasPortInInput port for natural gas
TransiEnt.Basics.Interfaces.Gas.RealGasPortOutgasPortOutoutput port for natural gas

Components

TypeNameDefaultDescription
TransiEnt.SimCentersimCenter
SI.MassFractionxi_H2inNGMass fraction of H2 in NG
SI.VolumeFlowRateV_flow_NG_stpVolume flow rate of NG at STP
SI.VolumeFlowRateV_flow_H2_NG_stpVolume flow rate of H2 in NG at STP
SI.VolumeFlowRateV_flow_H2_PtG_max_stpMaximum admissible PtG volume flow rate at STP
SI.MassFlowRatem_flow_NGMass flow of NG
SI.VolumeFractionphi_H2_stpVolume fraction of H2 in NG at STP
TILMedia.Internals.VLEFluidConfigurations.FullyMixtureCompatible.VLEFluid_pTvleGasNG_STP