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/*
freesteam - IAPWS-IF97 steam tables library
Copyright (C) 2004-2005 John Pye
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#define FREESTEAM_BUILDING_LIB
#include "b23.h"
#include <math.h>
const double B23_N[6] = { 0, 0.34805185628969E+03, -0.11671859879975E+01
, 0.10192970039326E-02, 0.57254459862746E+03, 0.13918839778870E+02
};
const double B23_PSTAR = 1e6;
double freesteam_b23_p_T(double T){
#define theta T
return (B23_N[1] + B23_N[2] * theta + B23_N[3] * SQ(theta)) * B23_PSTAR;
#undef theta
}
double freesteam_b23_T_p(double p){
double pi = p / B23_PSTAR;
return B23_N[4] + sqrt((pi - B23_N[5])/B23_N[3]) /* * 1{K} */;
}
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