def METHOD_NAME(self):
    """Carnot efficiency
    Calculates the Carnot efficiency for the specified process, :math:`\eta_c = 1 - \frac{T_c}{T_h}`.
    Returns
    -------
    float
    """
    Tvector = self._cycle_states.T
    return 1. - np.min(Tvector) / np.max(Tvector)