def m_coolwater_waste(Q_wastecooler, Cp_wastecooler, t_coolwater_exit, t_coolwater_enter):
    """
    Calculates the flow rate steam of waste cooler.
    Parameters
    ----------
    Q_wastecooler : float
        The heat load feed of waste cooler, [W] [J/s]
    Cp_wastecooler : float
        The heat capacity of water, [J/(kg * degrees C)]
    t_coolwater_exit: float
        The end temperature of cool waste, [degrees C]
    t_coolwater_enter: float
        The start temperature of cool waste, [degrees C]    
    Returns
    -------
    m_coolwater_waste : float
        The flow rate steam of waste cooler, [kg/s]
    References
    ----------
    Дытнерский, формула 2.3, стр.45
    """               
    return Q_wastecooler / (Cp_wastecooler * (t_coolwater_exit - t_coolwater_enter))