/*************************************************************************

* File:	aga10.h
* Description:	function prototypes and defines for aga10.cpp
* Version:	ver 1.7	2002.11.17
* Author:	W.B. Peterson

*Revisions:

*Copyright (c) 2002  American Gas Association
**************************************************************************/

#ifndef _AGA10_H #define _AGA10_H

/* Windows-specific export macro and header #include */ #if WIN32

#define DllExport __declspec (dllexport) #include <windows.h>
#else
#define DllExport #endif

/* other includes */ #include <strstream> #include <iostream> #include <fstream> #include <iomanip> #include <math.h>

/*	status codes */		
#define NORMAL		9000
#define AGA10_INITIALIZED		9001
#define MEMORY_ALLOCATION_ERROR		9002
#define GENERAL_CALCULATION_FAILURE		9003
#define MAX_NUM_OF_ITERATIONS_EXCEEDED	9004
#define NEGATIVE_DENSITY_DERIVATIVE		9005
#define MAX_DENSITY_IN_BRAKET_EXCEEDED	9006
/*	number of components */		
#define NUMBEROFCOMPONENTS	21	
/*	maximum number of tries within search routines */

#define MAX_NUM_OF_ITERATIONS 100

/*	default tolerance limits */				
#define P_CHG_TOL 0.001 /* 0.001 Pa */			
#define T_CHG_TOL 0.001 /* 0.001 of a Kelvin */		
/*	maximum allowable P & T */				
const	double P_MAX	=	1.379e8 ;	// maximum pressure (Pa) ~= 20,000 psi
const	double P_MIN	=	0.0 ;		// maximum pressure = 0	
const	double T_MAX	=	473.15 ;	// maximum temperature (K) ~= 392 F
const	double T_MIN	=	143.0	;	// maximum temperature (K) ~= -200 F
/*	universal gas constant, in two configurations */	
#define RGASKJ	8.314510e-3	/* in kJ mol^-1 K^-1 */	
#define RGAS	8.314510	/* in J mol^-1 K^-1 */	
/*	the main data structure used by this library */	
typedef struct tagAGA10STRUCT					
{	/* corresponds to the control group in meter classes */	
		
	long lStatus ;			/* calculation status */	
	bool bForceUpdate;			/* signal to perform full calculation */
	double adMixture[NUMBEROFCOMPONENTS] ;	/* Composition in mole fraction */
	double dPb ;			/* Contract base Pressure (Pa) */
	double dTb ;			/* Contract base temperature	(K) */
	double dPf ;			/* Absolute Pressure (Pa) */	
	double dTf ;			/* Flowing temperature (K) */	
	// basic output from AGA 8 Detail method		
	double dMrx ;			/* mixture molar mass */	
	double dZb ;			/* compressibility at contract base condition */
	double dZf ;			/* compressibility at flowing condition */
	double dFpv ;			/* supercompressibility */	
	double dDb ;			/* molar density at contract base conditions (moles/dm3) */
	double dDf ;			/* molar density at flowing conditions (moles/dm3) */
	double dRhob ;			/* mass density at contract base conditions (kg/m3) */
	double dRhof ;			/* mass density at flowing conditions (kg/m3) */
	double dRD_Ideal ;			/* ideal gas relative density */
	double dRD_Real ;			/* real gas relative density	*/
	// additional output					
	double dHo ;			/* ideal gas specific enthalpy */
	double dH ;	/* real gas specific enthalpy	(J/kg) */
double dS ;	/* real gas specific entropy	(J/kg-mol.K)*/
double dCpi ;	/* ideal gas constant pressure heat capacity (J/kg-mol.K)*/
double dCp ;	/* real gas constant pressure heat capacity (J/kg-mol.K)*/
double dCv ;	/* real gas constant volume heat capacity (J/kg-mol.K)*/
double dk ;	/* ratio of specific heats */	
double dKappa ;	/* isentropic exponent, denoted with Greek letter kappa */
double dSOS ;	/* speed of sound (m/s) */	
double dCstar ;	/* critical flow factor C* */	
} AGA10STRUCT ;


/* enumerations for tracking gas components */ enum gascomp{ XiC1=0, XiN2, XiCO2, XiC2, XiC3,

XiH2O, XiH2S, XiH2, XiCO, XiO2, XiIC4, XiNC4, XiIC5, XiNC5, XiNC6, XiNC7, XiNC8, XiNC9, XiNC10, XiHe, XiAr } ;


/* FUNCTION PROTOTYPES */

/* prototypes	for initialization */

 int AGA10_Init(void) ;	/* initialize library */
 int AGA10_UnInit(void) ;	/* un-initialize library */

/* function prototype for basic VOS calculation */  double SOS(AGA10STRUCT *) ;

/* function prototype for a C* calculation */  double Crit(AGA10STRUCT *, double) ;

#endif