def V_tank_Reflux(Reflux_mass, tau, rho_Reflux_20, dzeta_reserve):
    """
    Calculates the tank for waste.
    Parameters
    ----------
    Reflux_mass : float
        The mass flowrate of Reflux, [kg/s]
    tau : float
        The time, [s]
    rho_Reflux_20 : float
        The destiny of waste for 20 degrees celcium, [kg/m**3]
    dzeta_reserve : float
        The coefificent of reserve, [dismensionless]
    Returns
    -------
    V_tank_Reflux : float
        The tank for Reflux, [m**3]
    References
    ----------
    &&&&&&&&&&&&
    """     
    return Reflux_mass * tau * dzeta_reserve / rho_Reflux_20