def deltaT_boil(t_boil, t_cond):
    """
    Calculates the temperature difference of boiler.
    Parameters
    ----------
    t_boil : float
        The boiling temperature of liquid, [С]
    t_cond : float
        The condensation temperature of steam, [C]
    Returns
    -------
    deltaT_boil : float
        The temperature difference of boiler, [C]
    References
    ----------
    &&&&&
    """     
    return t_cond - t_boil