def A_real_boiler(Q_boiler, q_boiler):
    """
    Calculates the boiler's real heatransfer area.
    Parameters
    ----------
    Q_boiler : float
        The heat load of boiler, [W]
    q_boiler : float
        The unit heat load of boiler, [W/m**2]
    Returns
    -------
    A_real_boiler : float
        The boiler's real heatransfer area, [m**2]
    References
    ----------
    &&&&&
    """     
    return Q_boiler/q_boiler