Not possible to use other fluid property engines than coolprop in combustion component

[HaSchneider]

When I try to use other fluid property engines in combustion chamber I get an RuntimeError, because it forces to use coolprop in tespy.tools.global_vars.FluidAliases.get_fluid()

Example:

from tespy.components import (
    Source, Sink, 
    SimpleHeatExchanger, 
    DiabaticCombustionChamber,
)
from tespy.tools.fluid_properties.wrappers import PyromatWrapper

from tespy.connections import Connection


class my_PyromatWrapper(PyromatWrapper):
    def _set_constants(self):
        self._p_min, self._p_max = 100, 1000e5
        self._T_crit, self._p_crit = 0,0#self.AS.critical() not supported by pyromat
        self._T_min, self._T_max = self.AS.Tlim()
        self._molar_mass = self.AS.mw()

class create_solvent_combustion(ModelTemplate):
       
    def _create_network(self) -> None:
        super()._create_network()
        amb = Source('ambient air')
        sf = Source('fuel')
        fg = Sink('flue gas outlet')
        self.comb = DiabaticCombustionChamber('combustion chamber')
        self.hex = SimpleHeatExchanger('heat exchanger')
        
        
        self.amb_comb = Connection(amb, 'out1', self.comb, 'in1')
        self.sf_comb = Connection(sf, 'out1', self.comb, 'in2')
        self.comb_hex = Connection(self.comb, 'out1', self.hex, 'in1')
        self.hex_fg = Connection(self.hex, 'out1', fg, 'in1')
        self.nw.add_conns(self.sf_comb, self.amb_comb, self.comb_hex, self.hex_fg, 
        )
        self.comb.set_attr(ti=500000, pr=0.95, eta=1, lamb=2)
        self.amb_comb.set_attr(
            p=1.2, T=20,
            fluid={'Ar': 0.0129, 'N2': 0.7553, 'CO2': 0.0004, 'O2': 0.2214, 'ig::NO':0.01},
            fluid_engines={"NO": my_PyromatWrapper}, 
        )
        self.sf_comb.set_attr(
            p=1.3, T=25, fluid={'CO2': 0.03, 'H2': 0.01, 'CH4': 0.96},
        )
         
        self.hex.set_attr(pr=0.95)
        self.hex_fg.set_attr(T=200)

rva= create_solvent_combustion()
rva.nw.solve('design')

I get the Error:

RuntimeError: key [NO] was not found in string_to_index_map in JSONFluidLibrary

I fixed that for me in this commit. It is not well tested yet but might be a starting point to fix that in the main branch.

Note:

• I used the Modeltemplate here
• I needed to adjust the Pyromat wrapper as the "ig" engine doesnt know the T_crit and p_crit

[fwitte]

Hi @HaSchneider,

thank you for the suggestion. I had never tested a different engine than CoolProp for the combustion, so thank you for bringing this up. Maybe let's have a mini-hackathon in 2 or 3 weeks to fix the open topics in context of combustion (#770, #887 and #888) together?

Best