AixLib.Media.Steam.isentropicEnthalpy

# .AixLib.Media.Steam.isentropicEnthalpy

Isentropic enthalpy

## Information

Isentropic enthalpy is computed using the IAPWS-IF97 formulation:

1. A medium is in a particular state, `refState`.
2. The enthalpy at another state `h_is` shall be computed under the assumption that the state transformation from `refState` to `h_is` is performed with a change of specific entropy ds = 0 and the pressure of state `h_is` is `p_downstream` and the composition `X` upstream and downstream is assumed to be the same.

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