@staticmethod
def initialise_source(c, key):
    """
        Return a starting value for pressure and enthalpy at outlet.

        Parameters
        ----------
        c : tespy.connections.connection
            Connection to perform initialisation on.

        key : str
            Fluid property to retrieve.

        Returns
        -------
        val : float
            Starting value for pressure/enthalpy in SI units.

            .. math::

                val = \\begin{cases}
                10^5 & \\text{key = 'p'}\\\\
                5 \\cdot 10^5 & \\text{key = 'h'}
                \\end{cases}
        """
    if key == 'p':
        return 100000.0
    elif key == 'h':
        return 500000.0
