SteamCalculator Class Reference

Core class - define steam state in terms of p,T and optionally x. More...

#include <steamcalculator.h>

Inheritance diagram for SteamCalculator:

List of all members.

Public Member Functions
	SteamCalculator ()
	Constructor.
	SteamCalculator (const SteamCalculator &original)
	Copy constructor.
SteamCalculator const &	operator= (SteamCalculator const &original)
	Assignment operator (assigns a copy).
virtual	~SteamCalculator ()
	Destructor.
void	set_pT (const Pressure &p, const Temperature &T, double x=1.0)
template<class F, class S> void	set (const F &f, const S &s)
void	setSatSteam_p (const Pressure &p)
	Set state to be saturated steam at a specified pressure.
void	setSatWater_p (const Pressure &p)
	Set state to be saturated water at a specified pressure.
void	setSatWater_T (const Temperature &T)
	Set state to be saturated water at a specified temperature.
void	setSatSteam_T (const Temperature &T)
	Set state to be saturated steam at a specified temperature.
void	setB23_T (const Temperature &T)
	Set properties on B23 curve given temperature.
void	setB23_p (const Pressure &p)
	Set properties on B23 curve given pressure.
void	setRegion1_pT (const Pressure &p, const Temperature &T)
void	setRegion2_pT (const Pressure &p, const Temperature &T)
void	setRegion4_Tx (const Temperature &T, const Num &x)
void	setRegion3_rhoT (const Density &rho, const Temperature &T)
	Direct setting of rho,T for Region 3.
bool	isSet (void) const
	Has the state of the SteamCalculator been initialised?
int	whichRegion (void) const
	Get the region for the present SteamCalculator (1 to 4, according to IAPWS).
SteamStateCode	whichState (void)
	Get the state for the present SteamCalculator.
const char *	whichStateStr (void)
	Get a string version of steam state.
Temperature	temp () const
	Temperature.
Pressure	pres () const
	Pressure.
Density	dens () const
	Density, eg kg/m³.
SpecificVolume	specvol () const
	Specific volume, eg m³/kg.
SpecificEnergy	specienergy () const
	Specific internal energy, eg kJ/kg.
SpecificEntropy	specentropy () const
	Specific entropy, eg kJ/kg.
SpecificEnergy	specenthalpy () const
	Specific enthalpy, eg kJ/kg.
SpecHeatCap	speccp () const
	Specific isobaric hear capacity, eg kJ/kgK.
SpecHeatCap	speccv () const
	Specific isochoric heat capacity, eg kJ/kgK.
Num	quality () const
	Steam quality (if saturated).
DynamicViscosity	dynvisc () const
	Dynamic viscosity, mu, [µPa.s].
Conductivity	conductivity () const
	Conductivity [mW/m.K].
virtual bool	isValid (void) const
	Used for design-by-contract IS_VALID tests:.
virtual void	copy (const SteamCalculator &original)
	Copy operation, virtual.
template<> void	set (const Pressure &p, const Temperature &T)
template<> void	set (const Temperature &T, const Pressure &p)
Protected Member Functions
Num	tau_iaps85 () const
	Reduced temperature for IAPWS conductivity calculation.
Num	del_iaps85 () const
	Reduced density for IAPWS conductivity calculation.
Num	pi_iaps85 () const
	Reduced pressure for IAPWS conductivity calculation.
Num	delpi_iaps85 () const
Num	pitau_iaps85 () const
Num	lam () const
	Reduced thermal conductivity.
Num	lam0 () const
	Used in the calculation of reduced thermal conductivity.
Num	lam1 () const
	Used in the calculation of reduced thermal conductivity.
Num	lam2 () const
	Used in the calculation of reduced thermal conductivity.
Num	mu () const
	http://www.iapws.org/relguide/IF97.pdf
Num	mu0 () const
	http://www.iapws.org/relguide/IF97.pdf
Num	mu1 () const
	http://www.iapws.org/relguide/IF97.pdf
Num	mu2 () const
	http://www.iapws.org/relguide/IF97.pdf
Pressure	getRegion3PressureError (const Density &test_rho)
Protected Attributes
Temperature	T
	Temperature K.
Pressure	p
	Pressure MPa.
Density	rho
	Density, used by Region 3 only.
Num	x
	Quality, used by Region 4.
Num	tau
	Internal variable in IAPWS calcs.
Num	pi
	Internal variable in IAPWS calcs.
Num	del
	Internal variable in IAPWS calcs.
Pressure	reg3_target_pressure
	Internal variable used in root-finding in region 3.
Friends
class	ZeroIn< SteamCalculator, Pressure, Density >

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Detailed Description

Core class - define steam state in terms of p,T and optionally x.

To find the enthalpy of steam at p = 10 bar, T = 250 °C,

                        SteamCalculator S;
                        S.set_pT(10.0 * bar, fromcelsius(250));
                        cerr << S.specenthalpy() << endl;

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Constructor & Destructor Documentation

SteamCalculator::SteamCalculator (  const SteamCalculator &  original  )

Copy constructor. This function creates a new uninititalised SteamCalculator, or else clones an existing one.

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Member Function Documentation

Conductivity SteamCalculator::conductivity (   )  const

Conductivity [mW/m.K]. Returns the thermal conductivity of water/steam. Range of validity is entire regions 1,2,3,4. Reference: J Phys Chem Ref Data, vol 13, no 1, 1984, p. 175 ff. Returns: Thermal conductivity [W/m.K] See also: http://www.iapws.org/relguide/thcond.pdf http://www.iapws.org/relguide/IF97.pdf

Num SteamCalculator::del_iaps85 (   )  const [protected]

Reduced density for IAPWS conductivity calculation. Reference: IAPWS Revised Release on the IAPS Formulation 1985 for the Thermal Conductivity of Ordinary Water Substance, 1998, IAPWS. See also: http://www.iapws.org/relguide/thcond.pdf#page=8, Eq. 5 Density calculated with IAPWS SF95 is expected, in order to meet the reference values given

DynamicViscosity SteamCalculator::dynvisc (   )  const

Dynamic viscosity, mu, [µPa.s]. Returns the dynamic viscosity of water/steam. Assumes this->T in deg K. Range of validity is entire regions 1,2,3,4 Reference: J Phys Chem Ref Data, vol 13, no 1, 1984, p. 175 ff. Returns: Dynamic viscosity [µPa.s] See also: http://www.iapws.org/relguide/visc.pdf http://www.iapws.org/relguide/IF97.pdf

Num SteamCalculator::lam (   )  const [protected]

Reduced thermal conductivity. Returns: lambda_0 [dim'less] See also: http://www.iapws.org/relguide/IF97.pdf

Num SteamCalculator::lam0 (   )  const [protected]

Used in the calculation of reduced thermal conductivity. Reference: IAPWS Revised Release on the IAPS Formulation 1985 for the Thermal Conductivity of Ordinary Water Substance, 1998, IAPWS. Returns: lambda_0 [dim'less] See also: http://www.iapws.org/relguide/IF97.pdf

Num SteamCalculator::lam1 (   )  const [protected]

Used in the calculation of reduced thermal conductivity. Reference: IAPWS Revised Release on the IAPS Formulation 1985 for the Thermal Conductivity of Ordinary Water Substance, 1998, IAPWS. Returns: lambda_0 [dim'less] See also: http://www.iapws.org/relguide/IF97.pdf

Num SteamCalculator::lam2 (   )  const [protected]

Used in the calculation of reduced thermal conductivity. Reference: IAPWS Revised Release on the IAPS Formulation 1985 for the Thermal Conductivity of Ordinary Water Substance, 1998, IAPWS. Also, refer Bernhard Spang's IAPWS97 Excel Add-in, visual basic source code, version * 1.3. TODO: crossref with Sengers et al, J Phys Chem Ref Data v13 1984 pp893-933 Returns: lambda_0 [dim'less] See also: http://www.iapws.org/relguide/IF97.pdf

Num SteamCalculator::pi_iaps85 (   )  const [protected]

Reduced pressure for IAPWS conductivity calculation. Reference: IAPWS Revised Release on the IAPS Formulation 1985 for the Viscosity of Ordinary Water Substance, 2003, IAPWS. See also: http://www.iapws.org/relguide/visc.pdf#page=7, Eq. 7

Pressure SteamCalculator::pres (  void   )  const

Pressure. Returns the pressure at the state set.

Num SteamCalculator::quality (  void   )  const

Steam quality (if saturated). If saturated, returns the steam quality. If not saturated, returns 0.0 for region 1, 1.0 for region2, and for region 3, indeterminate, could be anything. Todo: Check this, make sure only legal values are possible in region 3. There is a bit of confusion in the code about 'region 4 inside region 3'.

void SteamCalculator::setRegion3_rhoT (  const Density &  rho, const Temperature &  T )

Direct setting of rho,T for Region 3. Todo: Ensure rho, T are valid for region 3

Num SteamCalculator::tau_iaps85 (   )  const [protected]

Reduced temperature for IAPWS conductivity calculation. Reference: IAPWS Revised Release on the IAPS Formulation 1985 for the Thermal Conductivity of Ordinary Water Substance, 1998, IAPWS. See also: http://www.iapws.org/relguide/thcond.pdf#page=8, Eq. 4

Temperature SteamCalculator::temp (  void   )  const

Temperature. Returns the absolute temperature at the state set.

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

• steamcalculator.h
• steamcalculator.cpp

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