public static double vvap_given_p(double p)
{
double ret_val;
try
{
ret_val = 1.0 / IF97.rhovap_p(p / 1000000.0); //expects:MPa returns Kg/M^3
return(ret_val);
}
catch (Exception ex)
{
Debug.Log(String.Format("Got an exception: {0}\nReturning {1}", ex.Message, v_neutral));
got_error = true;
return(v_neutral);
}
//return 1.0/IF97.rhovap_p(p/1000000.0); //expects:MPa returns Kg/M^3
}
public static double x_given_pv(double p, double v) //ONLY USE IN VAPOR DOME
{
double ret_val;
try
{
//f means saturated liquid,
//g means saturated gas
double vf = 1.0 / IF97.rholiq_p(p / 1000000.0);
double vg = 1.0 / IF97.rhovap_p(p / 1000000.0);
ret_val = (v - vf) / (vg - vf); //UNIT CONVERSION UNTESTED!
return(ret_val);
}
catch (Exception ex)
{
Debug.Log(String.Format("Got an exception: {0}\nReturning {1}", ex.Message, x_neutral));
got_error = true;
return(x_neutral);
}
//return (v-vf)/(vg-vf); //UNIT CONVERSION UNTESTED!
}
//a bunch of options for getting region here- still need to figure out most reliable
//region: 0 subcooled liquid, 1 two-phase, 2 superheated vapor
public static int region_given_pvt(double p, double v, double t)
{
int liq = 0;
int two = 1;
int vapor = 2;
//broad check w/ t
if (t - t_smallstep > IF97.Tsat97(p / 1000000.0))
{
return(vapor);
}
if (t + t_smallstep < IF97.Tsat97(p / 1000000.0))
{
return(liq);
}
//broad check w/ p - unneeded
//if(p-p_smallstep > IF97.psat97(t)) return liq;
//if(p+p_smallstep < IF97.psat97(t)) return vapor;
//fine check w/ v
//f means saturated liquid,
//g means saturated gas
double vf = 1.0 / IF97.rholiq_p(p / 1000000.0);
if (v <= vf)
{
return(liq);
}
double vg = 1.0 / IF97.rhovap_p(p / 1000000.0);
if (v >= vg)
{
return(vapor);
}
return(two);
}