modelRegenerativeAirPreheater_L4

Model for a regenerative air preheater

Extends from ClaRa.Basics.Icons.AirPreheater.

Information

Model description: A model for regenerative air preheaters

FEATURES

This model uses TILMedia
Component is build up as counter current heat exchanger with simplified heat transfer correlations
Heat transfer equations according to: H. Effenberger: Dampferzeugung, chapter 9.34
Air leakage is considered on the cold side of the air preheater with a constant value

For detailed model documentation please consult the html-documentation shipped with ClaRa.

Authorship and Copyright Statement for original (initial) Contribution

Author:

References:

For references please consult the html-documentation shipped with ClaRa.

Remarks:

This component was developed by ClaRa development team under the 3-clause BSD License.

Acknowledgements:

ClaRa originated from the collaborative research projects DYNCAP and DYNSTART. Both research projects were supported by the German Federal Ministry for Economic Affairs and Energy (FKZ 03ET2009 and FKZ 03ET7060).

CLA:

The author(s) have agreed to ClaRa CLA, version 1.0. See https://claralib.com/pdf/CLA.pdf

By agreeing to ClaRa CLA, version 1.0 the author has granted the ClaRa development team a permanent right to use and modify his initial contribution as well as to publish it or its modified versions under the 3-clause BSD License.

The ClaRa development team consists of the following partners:

TLK-Thermo GmbH (Braunschweig, Germany)

XRG Simulation GmbH (Hamburg, Germany).

Parameters

Type	Name	Default	Description
ClaRa.Basics.Units.MassFlowRate	m_flow_freshAir_nom	500	\|Physical Effects\|Nominal values\|Nominal value of fresh air mass flow rate
ClaRa.Basics.Units.MassFlowRate	m_flow_flueGas_nom	300	\|Physical Effects\|Nominal values\|Nominal value of flue gas mass flow rate
Basics.Units.Pressure	p_freshAir_nom	1.0e5	\|Physical Effects\|Nominal values\|Nominal value of fresh air pressure
Basics.Units.Pressure	p_flueGas_nom	1.0e5	\|Physical Effects\|Nominal values\|Nominal value of flue gas pressure
Basics.Units.Pressure	Delta_p_freshAir_nom	1.0e4	\|Physical Effects\|Nominal values\|Nominal value of fresh air pressure loss
Basics.Units.Pressure	Delta_p_flueGas_nom	1.0e4	\|Physical Effects\|Nominal values\|Nominal value of flue gas pressure loss
Basics.Units.MassFraction[medium.nc - 1]	xi_nom_freshAir	medium.xi_default	\|Physical Effects\|Nominal values\|Nominal composition
Basics.Units.MassFraction[medium.nc - 1]	xi_nom_flueGas	medium.xi_default	\|Physical Effects\|Nominal values\|Nominal composition
Boolean	frictionAtFreshAirInlet	false	\|Physical Effects\|Pressure Loss\|True if pressure loss between first fresh air cell and inlet shall be considered
Boolean	frictionAtFreshAirOutlet	false	\|Physical Effects\|Pressure Loss\|True if pressure loss between last fresh air cell and outlet shall be considered
Boolean	frictionAtFlueGasInlet	false	\|Physical Effects\|Pressure Loss\|True if pressure loss between first flue gas cell and inlet shall be considered
Boolean	frictionAtFlueGasOutlet	false	\|Physical Effects\|Pressure Loss\|True if pressure loss between last flue gas cell and outlet shall be considered
ClaRa.Basics.Units.Area	A_heat	volume_reg_eff*C	Overall heat transfer area
ClaRa.Basics.Units.Length	b	(diameter_reg - diameter_hub)/2	Length of storage material plates
ClaRa.Basics.Units.Area	A_plates	N_sps_spb	Cross sectional area in flow direction blocked by plates
Real	f_plates	A_plates/(A_cross - A_hub)	Factor of cross sectional area in flow direction blocked by plates
ClaRa.Basics.Units.Area	A_air_free	A_air*(1 - f_plates)	Cross sectional area of air flow
ClaRa.Basics.Units.Area	A_flueGas_free	A_flueGas*(1 - f_plates)	Cross sectional area of flue gas flow
ClaRa.Basics.Units.Volume	volume_flueGas	A_flueGas_free*height_reg	Flue gas volume
ClaRa.Basics.Units.Volume	volume_air	A_air_free*height_reg	Fresh air volume
ClaRa.Basics.Units.Volume	volume_reg_eff	(A_cross - A_hub - A_covered)*height_reg	Effective regenerator volume (without hub and covered volume)
ClaRa.Basics.Units.Volume	volume_st	(A_cross - A_hub)(f_plates)height_reg	Volume of solid regenerator storage material
ClaRa.Basics.Units.Mass	mass	if calculate_mass then volume_st*solid.d else mass_fixed	Mass of regenerator storage material
ClaRa.Basics.Units.Length	d_gl	4(A_cross - A_hub - A_plates)/(2N_sp*b)	Equivalent diameter
Geometry
Boolean	calculate_mass	true	True, if mass is calculated with nominal material density
ClaRa.Basics.Units.Mass	mass_fixed	100000	Fixed storage mass
ClaRa.Basics.Units.Length	diameter_reg	8	Regenerator diameter
ClaRa.Basics.Units.Length	diameter_hub	0.5	Hub diameter
ClaRa.Basics.Units.Length	height_reg	2	Regenerator height
Real	N_sp	3500	Number of storage plates
ClaRa.Basics.Units.Length	s_sp	0.6e-3	Thickness of storage plates
Real	C	440	Heating surface per volume (mass^2/mass^3)
ClaRa.Basics.Units.Area	A_covered	0.1*(A_cross - A_hub)	Covered regenerator cross section
ClaRa.Basics.Units.Area	A_flueGas	0.55*(A_cross - A_hub)	Cross section hit by flue gas
ClaRa.Basics.Units.Area	A_air	0.35*(A_cross - A_hub)	Cross section hit by fresh air
ClaRa.Basics.Units.Area	A_cross	Modelica.Constants.pi/4*diameter_reg^2	Overall regenerator cross section
General › Geometry
ClaRa.Basics.Units.Area	A_hub	Modelica.Constants.pi/4*diameter_hub^2	Hub cross section
Leakage
Real	leakage	0.05	Ratio of mass leakage from cold fresh air to cold flue gas
Discretisation
Integer	N_cv	3	Number of finite control volumes
Initialisation
Boolean	useHomotopy	simCenter.useHomotopy	True, if homotopy method is used during initialisation
Integer	initOptionCells	0	Type of gas cell initialisation
Integer	initOptionWall	213	Init Option of Wall
ClaRa.Basics.Units.Temperature[N_cv]	T_start_freshAir	ones(N_cv)*293.15	Start value of fresh air system Temperature
ClaRa.Basics.Units.Pressure[N_cv]	p_start_freshAir	ones(N_cv)*1.013e5	Start value of fresh air system pressure
ClaRa.Basics.Units.MassFraction[medium.nc - 1]	xi_start_freshAir	medium.xi_default	Start value of fresh air system mass fraction
ClaRa.Basics.Units.Temperature[N_cv]	T_start_flueGas	ones(N_cv)*400	Start value of flue gas system Temperature
ClaRa.Basics.Units.Pressure[N_cv]	p_start_flueGas	ones(N_cv)*1.013e5	Start value of flue gas system pressure
ClaRa.Basics.Units.MassFraction[medium.nc - 1]	xi_start_flueGas	medium.xi_default	Start value of flue gas system mass fraction
ClaRa.Basics.Units.Temperature[N_cv]	T_start_wall	ones(N_cv)*350	Start value of wall Temperature
Numerical Efficiency
Integer	stateLocation	2	Location of wall states
Fundamental Definitions
TILMedia.Gas.Types.BaseGas	medium	simCenter.flueGasModel	Medium to be used in tube

Connectors

Type	Name	Description
ClaRa.Basics.Interfaces.GasPortIn	flueGasInlet	Inlet port
ClaRa.Basics.Interfaces.GasPortOut	flueGasOutlet	Outlet port
ClaRa.Basics.Interfaces.GasPortIn	freshAirInlet	Inlet port
ClaRa.Basics.Interfaces.GasPortOut	freshAirOutlet	Outlet port
Basics.Interfaces.EyeOutGas	eye_flueGas
Basics.Interfaces.EyeOutGas	eye_freshAir

Components

Type	Name	Default	Description
ClaRa.SimCenter	simCenter
TILMedia.Solid.Solid	solid
Basics.ControlVolumes.GasVolumes.VolumeGas_L4	flueGasCell
Basics.ControlVolumes.GasVolumes.VolumeGas_L4	freshAirCell
Basics.ControlVolumes.SolidVolumes.ThinPlateWall_L4	wallSecondaryAir
VolumesValvesFittings.Fittings.FlueGasJunction_L2	freshAirLeakage_join
Summary	summary
VolumesValvesFittings.Valves.ThreeWayValveGas_L1_simple	freshAirLeakage_split

Name	Description
Summary
PressureLoss
HeatTransferFlueGas
HeatTransferFreshAir
Material

Revisions

For revisions please consult the html-documentation shipped with ClaRa.