Heat exchanger source model, in which the heat exchanger is defined as an energy source using a selection of cells. More...

Inheritance diagram for effectivenessHeatExchangerSource:

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Collaboration diagram for effectivenessHeatExchangerSource:

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Public Member Functions
	TypeName ("effectivenessHeatExchangerSource")
	Runtime type information. More...

	effectivenessHeatExchangerSource (const word &name, const word &modelType, const dictionary &dict, const fvMesh &mesh)
	Construct from components. More...

virtual	~effectivenessHeatExchangerSource ()=default
	Destructor. More...

virtual void	addSup (fvMatrix< scalar > &eqn, const label fieldi)
	Scalar. More...

virtual void	addSup (const volScalarField &rho, fvMatrix< scalar > &eqn, const label fieldi)
	Scalar. More...

virtual bool	read (const dictionary &dict)
	Read dictionary. More...

Public Member Functions inherited from cellSetOption
	TypeName ("cellSetOption")
	Runtime type information. More...

	cellSetOption (const word &name, const word &modelType, const dictionary &dict, const fvMesh &mesh)
	Construct from components. More...

virtual	~cellSetOption ()=default
	Destructor. More...

scalar	timeStart () const
	Return const access to the time start. More...

scalar	duration () const
	Return const access to the duration. More...

bool	inTimeLimits (const scalar time) const
	Return true if within time limits. More...

const selectionModeType &	selectionMode () const
	Return const access to the cell selection mode. More...

const word &	cellSetName () const
	Return const access to the name of cell set for "cellSet". More...

scalar	V () const
	Return const access to the total cell volume. More...

const labelList &	cells () const
	Return const access to the cell set. More...

scalar &	timeStart ()
	Return access to the time start. More...

scalar &	duration ()
	Return access to the duration. More...

virtual bool	isActive ()
	Is the source active? More...

Public Member Functions inherited from option
	TypeName ("option")
	Runtime type information. More...

	declareRunTimeSelectionTable (autoPtr, option, dictionary,(const word &name, const word &modelType, const dictionary &dict, const fvMesh &mesh),(name, modelType, dict, mesh))

	option (const word &name, const word &modelType, const dictionary &dict, const fvMesh &mesh)
	Construct from components. More...

autoPtr< option >	clone () const
	Return clone. More...

virtual	~option ()=default
	Destructor. More...

const word &	name () const
	Return const access to the source name. More...

const fvMesh &	mesh () const
	Return const access to the mesh database. More...

const dictionary &	coeffs () const
	Return dictionary. More...

bool	active () const
	Return const access to the source active flag. More...

void	setApplied (const label fieldi)
	Set the applied flag to true for field index fieldi. More...

Switch &	active ()
	Return access to the source active flag. More...

virtual label	applyToField (const word &fieldName) const
	Return index of field name if found in fieldNames list. More...

virtual void	checkApplied () const
	Check that the source has been applied. More...

virtual void	addSup (fvMatrix< vector > &eqn, const label fieldi)

virtual void	addSup (fvMatrix< symmTensor > &eqn, const label fieldi)

virtual void	addSup (fvMatrix< sphericalTensor > &eqn, const label fieldi)

virtual void	addSup (fvMatrix< tensor > &eqn, const label fieldi)

virtual void	addSup (const volScalarField &rho, fvMatrix< vector > &eqn, const label fieldi)

virtual void	addSup (const volScalarField &rho, fvMatrix< symmTensor > &eqn, const label fieldi)

virtual void	addSup (const volScalarField &rho, fvMatrix< sphericalTensor > &eqn, const label fieldi)

virtual void	addSup (const volScalarField &rho, fvMatrix< tensor > &eqn, const label fieldi)

virtual void	addSup (const volScalarField &alpha, const volScalarField &rho, fvMatrix< scalar > &eqn, const label fieldi)

virtual void	addSup (const volScalarField &alpha, const volScalarField &rho, fvMatrix< vector > &eqn, const label fieldi)

virtual void	addSup (const volScalarField &alpha, const volScalarField &rho, fvMatrix< symmTensor > &eqn, const label fieldi)

virtual void	addSup (const volScalarField &alpha, const volScalarField &rho, fvMatrix< sphericalTensor > &eqn, const label fieldi)

virtual void	addSup (const volScalarField &alpha, const volScalarField &rho, fvMatrix< tensor > &eqn, const label fieldi)

virtual void	constrain (fvMatrix< scalar > &eqn, const label fieldi)

virtual void	constrain (fvMatrix< vector > &eqn, const label fieldi)

virtual void	constrain (fvMatrix< sphericalTensor > &eqn, const label fieldi)

virtual void	constrain (fvMatrix< symmTensor > &eqn, const label fieldi)

virtual void	constrain (fvMatrix< tensor > &eqn, const label fieldi)

virtual void	correct (volScalarField &field)

virtual void	correct (volVectorField &field)

virtual void	correct (volSphericalTensorField &field)

virtual void	correct (volSymmTensorField &field)

virtual void	correct (volTensorField &field)

virtual void	writeHeader (Ostream &) const
	Write the source header information. More...

virtual void	writeFooter (Ostream &) const
	Write the source footer information. More...

virtual void	writeData (Ostream &) const
	Write the source properties. More...

Protected Attributes
scalar	secondaryMassFlowRate_
	Secondary flow mass rate [kg/s]. More...

scalar	secondaryInletT_
	Inlet secondary temperature [K]. More...

scalar	primaryInletT_
	Primary air temperature at the heat exchanger inlet [K]. More...

bool	userPrimaryInletT_
	Flag to use a user-specified primary inlet temperature. More...

bool	targetQdotActive_
	Flag to use target heat rejection. More...

scalar	targetQdot_
	Target heat rejection. More...

label	targetQdotCalcInterval_
	Target heat rejection calculation interval. More...

scalar	targetQdotRelax_
	Target heat rejection temperature under-relaxation coefficient. More...

autoPtr< interpolation2DTable< scalar > >	eTable_
	2D look up table efficiency = function of primary and secondary More...

word	UName_
	Name of velocity field; default = U. More...

word	TName_
	Name of temperature field; default = T. More...

word	phiName_
	Name of the flux. More...

word	faceZoneName_
	Name of the faceZone at the heat exchange inlet. More...

labelList	faceId_
	Local list of face IDs. More...

labelList	facePatchId_
	Local list of patch ID per face. More...

labelList	faceSign_
	List of +1/-1 representing face flip map (1 use as is, -1 negate) More...

Protected Attributes inherited from cellSetOption
scalar	timeStart_
	Time start. More...

scalar	duration_
	Duration. More...

selectionModeType	selectionMode_
	Cell selection mode. More...

word	cellSetName_
	Name of set/zone for "cellSet" and "cellZone" selectionMode. More...

List< point >	points_
	List of points for "points" selectionMode. More...

labelList	cells_
	Set of cells to apply source to. More...

scalar	V_
	Sum of cell volumes. More...

Protected Attributes inherited from option
const word	name_
	Source name. More...

const word	modelType_
	Model type. More...

const fvMesh &	mesh_
	Reference to the mesh database. More...

dictionary	dict_
	Top level source dictionary. More...

dictionary	coeffs_
	Dictionary containing source coefficients. More...

Switch	active_
	Source active flag. More...

wordList	fieldNames_
	Field names to apply source to - populated by derived models. More...

List< bool >	applied_
	Applied flag list - corresponds to each fieldNames_ entry. More...

Additional Inherited Members
Public Types inherited from cellSetOption
enum	selectionModeType { smPoints, smCellSet, smCellZone, smAll }
	Enumeration for selection mode types. More...

Static Public Member Functions inherited from option
static autoPtr< option >	New (const word &name, const dictionary &dict, const fvMesh &mesh)
	Return a reference to the selected fvOption model. More...

Public Attributes inherited from option
bool	log
	Switch write log to Info. More...

Static Public Attributes inherited from cellSetOption
static const Enum< selectionModeType >	selectionModeTypeNames_
	List of selection mode type names. More...

Protected Member Functions inherited from cellSetOption
void	setSelection (const dictionary &dict)
	Set the cellSet or points selection. More...

void	setCellSet ()
	Set the cell set based on the user input selection mode. More...

void	setVol ()
	Recalculate the volume. More...

Detailed Description

Heat exchanger source model, in which the heat exchanger is defined as an energy source using a selection of cells.

The total heat exchange source is given by:

\[ Q_t = e(\phi, \dot{m}_2) (T_2 - T_1) \phi c_p \]

where:

\( Q_t \)	=	total heat source
\( e(\phi,\dot{m}_2) \)	=	effectivenes table
\( \phi \)	=	net mass flux entering heat exchanger [kg/s]
\( \dot{m}_2 \)	=	secondary mass flow rate [kg/s]
\( T_1 \)	=	primary inlet temperature [K]
\( T_2 \)	=	secondary inlet temperature [K]
\( c_p \)	=	specific heat capacity [J/kg/K]

The distribution inside the heat exchanger is given by:

\[ Q_c = \frac{V_c |U_c| (T_c - T_{ref})}{\sum(V_c |U_c| (T_c - T_{ref}))} \]

where:

\( Q_c \)	=	source for cell
\( V_c \)	=	volume of the cell [m3]
\( U_c \)	=	local cell velocity [m/s]
\( T_c \)	=	local call temperature [K]
\( T_{ref} \)	=	min or max(T) in cell zone depending on the sign of Q_t [K]

Usage

Example usage:

effectivenessHeatExchangerSource1
{
    type            effectivenessHeatExchangerSource;
    active          yes;

    selectionMode   cellZone;
    cellZone        porosity;

    secondaryMassFlowRate   1.0;
    secondaryInletT 336;
    faceZone        facesZoneInletOriented;
    outOfBounds     clamp;
    file            "effTable";

    // Optional
    // primaryInletT 293;
    // targetQdot   1500;
}

Optional entries:

primaryInletT : sets the primary inlet temperature. If not set, the flux-averaged temperature is used.
targetQdot : target heat rejection

The effectiveness table is described in terms of the primary and secondary mass flow rates. For example, the table:

                       secondary MFR
                   |  0.1   0.2   0.3
              -----+-----------------
              0.02 |   A     B     C
 primary MFR  0.04 |   D     E     F
              0.06 |   G     H     I

is specified by the following:

Note

the table with name file should have the same units as the secondary mass flow rate and kg/s for phi
faceZone is the faces at the inlet of the cellzone, it needs to be created with flip map flags. It is used to integrate the net mass flow rate into the heat exchanger

Source files

Definition at line 218 of file effectivenessHeatExchangerSource.H.

Constructor & Destructor Documentation

◆ effectivenessHeatExchangerSource()

effectivenessHeatExchangerSource	(	const word &	name,
		const word &	modelType,
		const dictionary &	dict,
		const fvMesh &	mesh
	)

Construct from components.

Definition at line 136 of file effectivenessHeatExchangerSource.C.

References dict, dictionary::dictName(), and Foam::read().

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◆ ~effectivenessHeatExchangerSource()

virtual ~effectivenessHeatExchangerSource ( )

virtualdefault

Destructor.

Member Function Documentation

◆ TypeName()

TypeName ( "effectivenessHeatExchangerSource" )

Runtime type information.

◆ addSup() [1/2]

virtual void addSup	(	fvMatrix< scalar > &	eqn,
		const label	fieldi
	)

inlinevirtual

Scalar.

Reimplemented from option.

Definition at line 325 of file effectivenessHeatExchangerSource.H.

References NotImplemented.

◆ addSup() [2/2]

void addSup	(	const volScalarField &	rho,
		fvMatrix< scalar > &	eqn,
		const label	fieldi
	)

virtual

Scalar.

Reimplemented from option.

Definition at line 182 of file effectivenessHeatExchangerSource.C.

References Foam::constant::atomic::alpha, Foam::decrIndent(), dictionary::dictName(), Foam::endl(), forAll, Foam::gMax(), Foam::gMin(), Foam::incrIndent(), Foam::indent(), Foam::Info, Foam::fvc::interpolate(), Foam::mag(), Foam::max(), Foam::name(), Foam::nl, phi, Foam::reduce(), fvMatrix< Type >::source(), Foam::T(), Foam::type(), U, and Foam::Zero.

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◆ read()

bool read ( const dictionary & dict )

virtual

Read dictionary.

Reimplemented from cellSetOption.

Definition at line 315 of file effectivenessHeatExchangerSource.C.

References dict, Foam::endl(), Foam::indent(), Foam::Info, Foam::name(), Foam::nl, cellSetOption::read(), and Foam::type().

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Member Data Documentation

◆ secondaryMassFlowRate_

scalar secondaryMassFlowRate_

protected

Secondary flow mass rate [kg/s].

Definition at line 228 of file effectivenessHeatExchangerSource.H.

◆ secondaryInletT_

scalar secondaryInletT_

protected

Inlet secondary temperature [K].

Definition at line 231 of file effectivenessHeatExchangerSource.H.

◆ primaryInletT_

scalar primaryInletT_

protected

Primary air temperature at the heat exchanger inlet [K].

Definition at line 234 of file effectivenessHeatExchangerSource.H.

◆ userPrimaryInletT_

bool userPrimaryInletT_

protected

Flag to use a user-specified primary inlet temperature.

Definition at line 237 of file effectivenessHeatExchangerSource.H.

◆ targetQdotActive_

bool targetQdotActive_

protected

Flag to use target heat rejection.

Definition at line 240 of file effectivenessHeatExchangerSource.H.

◆ targetQdot_

scalar targetQdot_

protected

Target heat rejection.

Definition at line 243 of file effectivenessHeatExchangerSource.H.

◆ targetQdotCalcInterval_

label targetQdotCalcInterval_

protected

Target heat rejection calculation interval.

Definition at line 246 of file effectivenessHeatExchangerSource.H.

◆ targetQdotRelax_

scalar targetQdotRelax_

protected

Target heat rejection temperature under-relaxation coefficient.

Definition at line 249 of file effectivenessHeatExchangerSource.H.

◆ eTable_

autoPtr<interpolation2DTable<scalar> > eTable_

protected

2D look up table efficiency = function of primary and secondary

mass flow rates [kg/s]

Definition at line 253 of file effectivenessHeatExchangerSource.H.

◆ UName_

word UName_

protected

Name of velocity field; default = U.

Definition at line 256 of file effectivenessHeatExchangerSource.H.

◆ TName_

word TName_

protected

Name of temperature field; default = T.

Definition at line 259 of file effectivenessHeatExchangerSource.H.

◆ phiName_

word phiName_

protected

Name of the flux.

Definition at line 262 of file effectivenessHeatExchangerSource.H.

◆ faceZoneName_

word faceZoneName_

protected

Name of the faceZone at the heat exchange inlet.

Definition at line 265 of file effectivenessHeatExchangerSource.H.

◆ faceId_

labelList faceId_

protected

Local list of face IDs.

Definition at line 268 of file effectivenessHeatExchangerSource.H.

◆ facePatchId_

labelList facePatchId_

protected

Local list of patch ID per face.

Definition at line 271 of file effectivenessHeatExchangerSource.H.

◆ faceSign_

labelList faceSign_

protected

List of +1/-1 representing face flip map (1 use as is, -1 negate)

Definition at line 274 of file effectivenessHeatExchangerSource.H.

The documentation for this class was generated from the following files:

src/fvOptions/sources/derived/effectivenessHeatExchangerSource/effectivenessHeatExchangerSource.H
src/fvOptions/sources/derived/effectivenessHeatExchangerSource/effectivenessHeatExchangerSource.C

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ effectivenessHeatExchangerSource()

◆ ~effectivenessHeatExchangerSource()

Member Function Documentation

◆ TypeName()

◆ addSup() [1/2]

◆ addSup() [2/2]

◆ read()

Member Data Documentation

◆ secondaryMassFlowRate_

◆ secondaryInletT_

◆ primaryInletT_

◆ userPrimaryInletT_

◆ targetQdotActive_

◆ targetQdot_

◆ targetQdotCalcInterval_

◆ targetQdotRelax_

◆ eTable_

◆ UName_

◆ TName_

◆ phiName_

◆ faceZoneName_

◆ faceId_

◆ facePatchId_

◆ faceSign_