FuelCell::OperatingConditions Class Reference

Class used to store, read from file and define the operating conditions for a fuel cell. More...

#include <operating_conditions.h>

Public Member Functions
	OperatingConditions ()
	Constructor. More...
	~OperatingConditions ()
	Destructor. More...
void	declare_parameters (ParameterHandler &param) const
	Declare all necessary parameters in order to compute the coefficients. More...
void	initialize (ParameterHandler &param)
	Class used to read in data and initialize the necessary data to compute the coefficients. More...
double	saturation_pressure () const
	Get the water vapour saturation pressure in atmospheres (atm) using cell temperature. More...
double	get_x_wv () const
	Get the mole fraction of water at the cathode channel from pressure, temperature, and relative humidity note that the anode mole fraction of water is not required, as there are only two species so x_wv_a = 1 - x_h2. More...
double	get_x_o2 () const
	Get the mole fraction of oxygen at the cathode channel from pressure, temperature, and relative humidity. More...
double	get_x_h2 () const
	Get the mole fraction of hydrogen at the anode channel from pressure, temperature, and relative humidity. More...
double	voltage_cell_th ()
	NOTE: This function is redefined in base_kinetics class, considering variable temperature and gas pressures. More...
void	print_operating_conditions () const
	Output operating conditions to screen. More...
void	adjust_initial_solution (std::vector< component_materialID_value_map > &maps, const boost::shared_ptr< FuelCellShop::Geometry::GridBase< dim > > grid) const
void	adjust_boundary_conditions (std::vector< component_boundaryID_value_map > &maps, const boost::shared_ptr< FuelCellShop::Geometry::GridBase< dim > > grid) const
	Routine used in order to adjust boundary conditions for O2 and cell voltage. More...
double	get_c_c () const
	Get the total gas concentration in the cathode. More...
double	get_T () const
	Return cell temperture as input in Operating Conditions subsection. More...
double	get_V () const
	Return cell voltage as input in Operating Conditions subsection. More...
double	get_dV_a () const
	Return the voltage drop in the anode. More...
double	get_pc_Pa () const
	Return cathode pressure as input in Operating Conditions subsection. More...
double	get_pc_atm () const
	Return cathode pressure as input in Operating Conditions subsection. More...
double	get_c_a () const
	Get the total gas concentration in the anode. More...
double	get_pa_Pa () const
	Return anode pressure as input in Operating Conditions subsection. More...
double	get_pa_atm () const
	Return anode pressure as input in Operating Conditions subsection. More...
double	get_RH_a () const
	Return anode relative humidity as input in Operating Conditions subsection. More...
double	get_RH_c () const
	Return cathode relative humidity as input in Operating Conditions subsection. More...
double	get_OCV () const
	Get the open circuit voltage for the cell. More...

Private Attributes
bool	adjust_BC
	Bool set to true if you want to modify boundary conditions. More...
double	R
double	channel_oxygen_mole_fraction
	Initial amount of oxygen in channel prior to humidification. More...
double	T_cell
	Operating temperature of the cell. More...
double	V_cell
	Operating voltage of the cell. More...
double	dV_a
	Voltage drop in the anode. More...
double	OCV
	Open circuit voltage for the cell. More...
double	E_th
	Theoretical voltage for the cell. More...
double	p_a
	Pressure of the gas mixture in the anode B.C. More...
double	c_a
	Concentration of the gas mixture in the anode B.C. More...
double	RH_a
	Relative humidity of the gas mixture in the anode B.C. More...
double	p_c
	Pressure of the gas mixture in the cathode B.C. More...
double	c_c
	Concentration of the gas mixture in the cathode B.C. More...
double	RH_c
	Relative humidity of the gas mixture in the anode B.C. More...

Detailed Description

Class used to store, read from file and define the operating conditions for a fuel cell.

It stores the following:

• cell temperature
• cell voltage
• oxygen mole fraction at the inlet of the channel
• relative humidity at anode and cathode
• total pressure at anode and cathode

This information, in conjunction with the water saturation equation is used to compute the mole fractions for each component in the mixture.

If the inlet is humidified air, please set the oxygen mole fraction to 0.21 (default).

In the input file, the following parameters can be specified (see declare_parameters ):

* subsection Fuel cell data
* (...)
*   subsection Operating conditions
*     set Adjust initial solution and boundary conditions = false
*     set Temperature cell = 353
*     set Cathode pressure = 101325
*     set Cathode initial oxygen mole fraction (prior to humidification) = 0.21
*     set Cathode relative humidity = 0.7
*     set Anode pressure = 101325
*     set Anode relative humidity = 0.7
*     set Voltage cell = 0.6
*     set Voltage drop in the anode = 0.015
*     set Open circuit voltage = 1.23
*   end
* end
* 

Usage Details:

In order to use this class, first an object of the class needs to be created. Usually, one such objects exists in every application. To create the object, include the .h file in the include application file and in the application data member section add the object. For example:

* #include "operating_conditions.h"
* 
* // Then in the data member declaration (usually a private member)
* FuelCell::OperatingConditions OC;
* 

Once the object is created, the section where the input data will be specified in the input file needs to be delcared. To do so, in the declare_parameters section of your application call the following:

* //--------- IN DECLARE_PARAMETERS ------------------------------------------------------
* template <int dim>
* void 
* NAME::AppCathode<dim>::declare_parameters(ParameterHandler& param)
* {
*   (...)
*   OC.declare_parameters(param);
*   (...)
* }
* 

Finally, once the input file has been read by our application, your class needs to be initialized. This is achieved using the function initialize()

* //--------- IN INITIALIZE ------------------------------------------------------
* template <int dim>
* void
* NAME::AppCathode<dim>::_initialize(ParameterHandler& param)
* {   
*  (...) 
*  OC.initialize(param);
* }
* 

You are now ready to use your OperatingConditions object!.

Author

M. Secanell, 2009-2013

Constructor & Destructor Documentation

FuelCell::OperatingConditions::OperatingConditions

(

)

Constructor.

FuelCell::OperatingConditions::~OperatingConditions

(

)

Destructor.

Member Function Documentation

void FuelCell::OperatingConditions::adjust_boundary_conditions	(	std::vector< component_boundaryID_value_map > &	maps,
		const boost::shared_ptr< FuelCellShop::Geometry::GridBase< dim > >	grid
	)		const

Routine used in order to adjust boundary conditions for O2 and cell voltage.

This routine should be called after the component_boundaryID_value_map has been initialized.

In order for the application to work well, the boundary IDs for the channel/GDL and land/GDL interfaces need to be properly identified in the grid section of the input file, i.e.

* subsection Grid generation
*   subsection Internal mesh generator parameters
*     subsection Boundary ID
*       set c_Ch/GDL = 100
*       set c_BPP/GDL = 200
*       set a_Ch/GDL = 100
*       set a_BPP/GDL = 200
*     end  
*   end
* end
* 

void FuelCell::OperatingConditions::adjust_initial_solution	(	std::vector< component_materialID_value_map > &	maps,
		const boost::shared_ptr< FuelCellShop::Geometry::GridBase< dim > >	grid
	)		const

void FuelCell::OperatingConditions::declare_parameters

(

ParameterHandler &

param

)

const

Declare all necessary parameters in order to compute the coefficients.

The parameters that can be specified in the input file are as follows:

* subsection Fuel cell data
* (...)
*   subsection Operating conditions
*     set Adjust initial solution and boundary conditions = false  
*     set Temperature cell = 353
*     set Cathode pressure = 101325
*     set Cathode initial oxygen mole fraction (prior to humidification) = 0.21
*     set Cathode relative humidity = 0.7
*     set Anode pressure = 101325
*     set Anode relative humidity = 0.7
*     set Voltage cell = 0.6
*     set Voltage drop in the anode = 0.015
*     set Open circuit voltage = 1.23
*   end
* end
* 

double FuelCell::OperatingConditions::get_c_a ( ) const

inline

Get the total gas concentration in the anode.

double FuelCell::OperatingConditions::get_c_c ( ) const

inline

Get the total gas concentration in the cathode.

NOTE: This is a constant value. Use only if the total gas concentration is assumed to be constant

double FuelCell::OperatingConditions::get_dV_a ( ) const

inline

Return the voltage drop in the anode.

Note

Can be used as boundary condition for anode model or initial condition in a full MEA model

double FuelCell::OperatingConditions::get_OCV ( ) const

inline

Get the open circuit voltage for the cell.

double FuelCell::OperatingConditions::get_pa_atm ( ) const

inline

Return anode pressure as input in Operating Conditions subsection.

double FuelCell::OperatingConditions::get_pa_Pa ( ) const

inline

Return anode pressure as input in Operating Conditions subsection.

double FuelCell::OperatingConditions::get_pc_atm ( ) const

inline

Return cathode pressure as input in Operating Conditions subsection.

double FuelCell::OperatingConditions::get_pc_Pa ( ) const

inline

Return cathode pressure as input in Operating Conditions subsection.

double FuelCell::OperatingConditions::get_RH_a ( ) const

inline

Return anode relative humidity as input in Operating Conditions subsection.

double FuelCell::OperatingConditions::get_RH_c ( ) const

inline

Return cathode relative humidity as input in Operating Conditions subsection.

double FuelCell::OperatingConditions::get_T ( ) const

inline

Return cell temperture as input in Operating Conditions subsection.

double FuelCell::OperatingConditions::get_V ( ) const

inline

Return cell voltage as input in Operating Conditions subsection.

double FuelCell::OperatingConditions::get_x_h2

(

)

const

Get the mole fraction of hydrogen at the anode channel from pressure, temperature, and relative humidity.

double FuelCell::OperatingConditions::get_x_o2

(

)

const

Get the mole fraction of oxygen at the cathode channel from pressure, temperature, and relative humidity.

double FuelCell::OperatingConditions::get_x_wv

(

)

const

Get the mole fraction of water at the cathode channel from pressure, temperature, and relative humidity note that the anode mole fraction of water is not required, as there are only two species so x_wv_a = 1 - x_h2.

void FuelCell::OperatingConditions::initialize

(

ParameterHandler &

param

)

Class used to read in data and initialize the necessary data to compute the coefficients.

void FuelCell::OperatingConditions::print_operating_conditions

(

)

const

Output operating conditions to screen.

double FuelCell::OperatingConditions::saturation_pressure

(

)

const

Get the water vapour saturation pressure in atmospheres (atm) using cell temperature.

double FuelCell::OperatingConditions::voltage_cell_th

(

)

NOTE: This function is redefined in base_kinetics class, considering variable temperature and gas pressures.

The function here should only be used for defining Initial condition values. Get the theoretical cell voltage using the cell temperature, and the reactant gas pressures

Member Data Documentation

bool FuelCell::OperatingConditions::adjust_BC

private

Bool set to true if you want to modify boundary conditions.

double FuelCell::OperatingConditions::c_a

private

Concentration of the gas mixture in the anode B.C.

double FuelCell::OperatingConditions::c_c

private

Concentration of the gas mixture in the cathode B.C.

double FuelCell::OperatingConditions::channel_oxygen_mole_fraction

private

Initial amount of oxygen in channel prior to humidification.

double FuelCell::OperatingConditions::dV_a

private

Voltage drop in the anode.

double FuelCell::OperatingConditions::E_th

private

Theoretical voltage for the cell.

double FuelCell::OperatingConditions::OCV

private

Open circuit voltage for the cell.

double FuelCell::OperatingConditions::p_a

private

Pressure of the gas mixture in the anode B.C.

double FuelCell::OperatingConditions::p_c

private

Pressure of the gas mixture in the cathode B.C.

double FuelCell::OperatingConditions::R

private

double FuelCell::OperatingConditions::RH_a

private

Relative humidity of the gas mixture in the anode B.C.

double FuelCell::OperatingConditions::RH_c

private

Relative humidity of the gas mixture in the anode B.C.

double FuelCell::OperatingConditions::T_cell

private

Operating temperature of the cell.

double FuelCell::OperatingConditions::V_cell

private

Operating voltage of the cell.

---

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

• operating_conditions.h