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Use real gas compressibility in planner

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Modify formluas for gas use to take into account the
compressibility correction for real gases. This introduces
also the inverse formula to compute the pressure for a given
amount of gas.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
This commit is contained in:
Robert C. Helling 2017-01-12 21:19:40 +01:00 • committed by Dirk Hohndel
parent fedadc65db
commit 7725842383
3 changed files with 19 additions and 4 deletions
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10
core/gas-model.c
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@ -62,3 +62,13 @@ double gas_compressibility_factor(struct gasmix *gas, double bar)
*/
return Z * 0.001 + 1.0;
}
/* Compute the new pressure when compressing (expanding) volome v1 at pressure p1 bar to volume v2
* taking into account the compressebility (to first order) */
double isothermal_pressure(struct gasmix *gas, double p1, int volume1, int volume2)
{
double p_ideal = p1 * volume1 / volume2 / gas_compressibility_factor(gas, p1);
return p_ideal * gas_compressibility_factor(gas, p_ideal);
}