Hmass upper and low limits

[Adam McCartney]

Hello all,

I have been looking for the upper and lower limits for the enthalpy inputs into the PropsSI function. I usually update my AbstractState with AS.update(CP.HmassP_INPUTS, h, P). I would like to know before hand if I am going to get an error before I update my h, and ask for props. I know CP knows the limits because when I get an error is tells it to me, which inspired this monstrosity:

def get_h_min_mol(P: float, fld: str) -> float:

    # get min h from exception message

    try:

        CP.PropsSI('T', 'P', P, 'H', -1e6, fld)

    except Exception as e:

        # strip the execption message to get min h in J/mol

        h_min = str(e).split("minimum value of")[1].split("J/mol")[0].strip()

        # convert to float

        try:

            return float(h_min)

        except ValueError:

            raise ValueError(f"Could not extract h_min from CoolProp error message for P={P} Pa, fluid='{fld}'")

But there must be a better way.

Regards
Adam

[Ian Bell]

Discussions on GitHub are a better place to ask questions now.

In general limts are based on temperature and/or pressure, rather than enthalpy or entropy (also enthalpy and entropy are tricky ones due to their reference states)

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