Detailed Description

The BHE_CXA class is the realization of Coaxial pipe with Annular type of the Borehole Heate Exchanger. In this class, the pipe heat capacity, pipe heat conduction, pipe advection vectors are initialized according to the geometry of CXA type of BHE. For CXA type of BHE, 3 primary unknowns are assigned on the 1D BHE elements. They are the temperature in inflow pipe T_in, temperature in outflow pipe T_out, temperature of the grout zone surrounding the inflow pipe T_g. These primary variables are solved according to heat convection and conduction equations on the pipes and also in the grout zone. The interaction of the CXA type of BHE and the surrounding soil is regulated through the thermal resistance values, which are calculated specifically during the initialization of the class.

Definition at line 37 of file BHE_CXA.h.

#include <BHE_CXA.h>

Inheritance diagram for ProcessLib::HeatTransportBHE::BHE::BHE_CXA:

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Collaboration diagram for ProcessLib::HeatTransportBHE::BHE::BHE_CXA:

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Public Member Functions
	BHE_CXA (BoreholeGeometry const &borehole, RefrigerantProperties const &refrigerant, GroutParameters const &grout, FlowAndTemperatureControl const &flowAndTemperatureControl, PipeConfigurationCoaxial const &pipes, bool const use_python_bcs)

std::array< double, number_of_unknowns >	crossSectionAreas () const

Public Member Functions inherited from ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial
	BHECommonCoaxial (BoreholeGeometry const &borehole, RefrigerantProperties const &refrigerant, GroutParameters const &grout, FlowAndTemperatureControl const &flowAndTemperatureControl, PipeConfigurationCoaxial const &pipes, bool const use_python_bcs)

double	thermalResistance (int const unknown_index) const

double	updateFlowRateAndTemperature (double T_out, double current_time)

std::array< double, number_of_unknowns >	calcThermalResistances (double const Nu_inner_pipe, double const Nu_annulus_pipe) const

std::array< double, number_of_unknowns >	pipeHeatCapacities () const

std::array< double, number_of_unknowns >	pipeHeatConductions () const

std::array< Eigen::Vector3d, number_of_unknowns >	pipeAdvectionVectors (Eigen::Vector3d const &) const

void	updateHeatTransferCoefficients (double const flow_rate)

Static Public Member Functions
template<int NPoints, typename SingleUnknownMatrixType , typename RMatrixType , typename RPiSMatrixType , typename RSMatrixType >
static void	assembleRMatrices (int const idx_bhe_unknowns, Eigen::MatrixBase< SingleUnknownMatrixType > const &matBHE_loc_R, Eigen::MatrixBase< RMatrixType > &R_matrix, Eigen::MatrixBase< RPiSMatrixType > &R_pi_s_matrix, Eigen::MatrixBase< RSMatrixType > &R_s_matrix)

Static Public Member Functions inherited from ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial
static std::array< std::pair< std::size_t, int >, 2 >	getBHEInflowDirichletBCNodesAndComponents (std::size_t const top_node_id, std::size_t const, int const in_component_id)

static std::optional< std::array< std::pair< std::size_t, int >, 2 > >	getBHEBottomDirichletBCNodesAndComponents (std::size_t const bottom_node_id, int const in_component_id, int const out_component_id)

Private Member Functions
std::array< double, 2 >	velocities () const override

std::array< double, number_of_unknowns >	getThermalResistances (double const &R_gs, double const &R_ff, double const &R_fg) const override

Additional Inherited Members
Public Attributes inherited from ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial
double	cross_section_area_inner_pipe

double	cross_section_area_annulus

double	cross_section_area_grout

Public Attributes inherited from ProcessLib::HeatTransportBHE::BHE::BHECommon
BoreholeGeometry const	borehole_geometry

RefrigerantProperties const	refrigerant

GroutParameters const	grout

FlowAndTemperatureControl const	flowAndTemperatureControl

bool const	use_python_bcs

Static Public Attributes inherited from ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial
static constexpr int	number_of_unknowns = 3

static constexpr int	number_of_grout_zones = 1

static constexpr std::pair< int, int >	inflow_outflow_bc_component_ids []

Protected Attributes inherited from ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial
PipeConfigurationCoaxial const	_pipes

std::array< double, number_of_unknowns >	_thermal_resistances

double	_flow_velocity_inner = std::numeric_limits<double>::quiet_NaN()
	Flow velocity inside the pipes and annulus. Depends on the flow_rate.

double	_flow_velocity_annulus = std::numeric_limits<double>::quiet_NaN()

Constructor & Destructor Documentation

◆ BHE_CXA()

ProcessLib::HeatTransportBHE::BHE::BHE_CXA::BHE_CXA	(	BoreholeGeometry const &	borehole,
		RefrigerantProperties const &	refrigerant,
		GroutParameters const &	grout,
		FlowAndTemperatureControl const &	flowAndTemperatureControl,
		PipeConfigurationCoaxial const &	pipes,
		bool const	use_python_bcs )

inline

Definition at line 40 of file BHE_CXA.h.

        : BHECommonCoaxial{borehole, refrigerant,
                           grout,    flowAndTemperatureControl,
                           pipes,    use_python_bcs}
    {
        // Initialize thermal resistances.
        auto values = visit(
            [&](auto const& control) {
                return control(refrigerant.reference_temperature,
                               0. /* initial time */);
            },
            flowAndTemperatureControl);
        updateHeatTransferCoefficients(values.flow_rate);
    }

References ProcessLib::HeatTransportBHE::BHE::BHECommon::flowAndTemperatureControl, ProcessLib::HeatTransportBHE::BHE::RefrigerantProperties::reference_temperature, ProcessLib::HeatTransportBHE::BHE::BHECommon::refrigerant, and ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial::updateHeatTransferCoefficients().

Member Function Documentation

◆ assembleRMatrices()

template<int NPoints, typename SingleUnknownMatrixType , typename RMatrixType , typename RPiSMatrixType , typename RSMatrixType >

static void ProcessLib::HeatTransportBHE::BHE::BHE_CXA::assembleRMatrices	(	int const	idx_bhe_unknowns,
		Eigen::MatrixBase< SingleUnknownMatrixType > const &	matBHE_loc_R,
		Eigen::MatrixBase< RMatrixType > &	R_matrix,
		Eigen::MatrixBase< RPiSMatrixType > &	R_pi_s_matrix,
		Eigen::MatrixBase< RSMatrixType > &	R_s_matrix )

inlinestatic

Definition at line 63 of file BHE_CXA.h.

    {
        switch (idx_bhe_unknowns)
        {
            case 0:  // PHI_fig
                R_matrix.block(0, 2 * NPoints, NPoints, NPoints) +=
                    -1.0 * matBHE_loc_R;
                R_matrix.block(2 * NPoints, 0, NPoints, NPoints) +=
                    -1.0 * matBHE_loc_R;
 
                R_matrix.block(0, 0, NPoints, NPoints) +=
                    1.0 * matBHE_loc_R;  // K_i
                R_matrix.block(2 * NPoints,
                               2 * NPoints,
                               NPoints,
                               NPoints) += 1.0 * matBHE_loc_R;  // K_ig
                return;
            case 1:  // PHI_ff
                R_matrix.block(0, NPoints, NPoints, NPoints) +=
                    -1.0 * matBHE_loc_R;
                R_matrix.block(NPoints, 0, NPoints, NPoints) +=
                    -1.0 * matBHE_loc_R;
 
                R_matrix.block(0, 0, NPoints,
                               NPoints) += 1.0 * matBHE_loc_R;  // K_i1
                R_matrix.block(NPoints, NPoints, NPoints, NPoints) +=
                    1.0 * matBHE_loc_R;  // K_o
                return;
            case 2:  // PHI_gs
                R_s_matrix += matBHE_loc_R;
 
                R_pi_s_matrix.block(2 * NPoints, 0, NPoints, NPoints) +=
                    -1.0 * matBHE_loc_R;
 
                R_matrix.block(2 * NPoints, 2 * NPoints, NPoints,
                               NPoints) += matBHE_loc_R;  // K_ig
                return;
            default:
                OGS_FATAL(
                    "Error!!! In the function BHE_CXA::assembleRMatrices, "
                    "the index of bhe unknowns is out of range! ");
        }
    }

References OGS_FATAL.

◆ crossSectionAreas()

std::array< double, number_of_unknowns > ProcessLib::HeatTransportBHE::BHE::BHE_CXA::crossSectionAreas ( ) const

inline

Definition at line 112 of file BHE_CXA.h.

    {
        return {cross_section_area_annulus, cross_section_area_inner_pipe,
                cross_section_area_grout};
    }

References ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial::cross_section_area_annulus, ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial::cross_section_area_grout, and ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial::cross_section_area_inner_pipe.

◆ getThermalResistances()

std::array< double, number_of_unknowns > ProcessLib::HeatTransportBHE::BHE::BHE_CXA::getThermalResistances	(	double const &	R_gs,
		double const &	R_ff,
		double const &	R_fg ) const

inlineoverrideprivatevirtual

Implements ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial.

Definition at line 124 of file BHE_CXA.h.

    {
        return {R_fg, R_ff, R_gs};
    }

◆ velocities()

std::array< double, 2 > ProcessLib::HeatTransportBHE::BHE::BHE_CXA::velocities ( ) const

inlineoverrideprivatevirtual

Implements ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial.

Definition at line 119 of file BHE_CXA.h.

    {
        return {_flow_velocity_annulus, _flow_velocity_inner};
    }

References ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial::_flow_velocity_annulus, and ProcessLib::HeatTransportBHE::BHE::BHECommonCoaxial::_flow_velocity_inner.

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

ProcessLib/HeatTransportBHE/BHE/BHE_CXA.h

Detailed Description

Public Member Functions

Static Public Member Functions

Private Member Functions