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Next: Downcomer flow path, Up: Primary coolant circulation loop Previous: Steam separator assembly, Contents Index

Feedwater inlet flow path, $\fbox{4}$

In flow path $\framebox{4}$ the highly subcooled feedwater is mixed with the saturated liquid from the separator $\framebox{3}$ through a so-called sparger.

The pressure change associated with flow path $\framebox{4}$ , $\Delta p_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 4}}}$ [Pa], is calculated by the expression

$\begin{displaymath} \Delta p_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scr... ...5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 4}}}}^2}{2\rho_f} \end{displaymath}$

(5.17)

where we have neglected the volume contents of vapor due to carry-under and $K_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 4}}}$ is the local loss coefficient of the feedwater inlet flow path [--]. The mass flux in flow path $\framebox{4}$ is given by

$\begin{displaymath} \mbox{$<\!{G}\!>$}_{\framebox[1.5ex]{\raisebox{-2.2pt}[0pt]... ...framebox[1.5ex]{\raisebox{-2.2pt}[0pt][0ex]{\scriptsize 4}}}}} \end{displaymath}$

(5.18)

where the mass flow rates $\mbox{$\dot{m}$}_{\ell_2}$ and $\mbox{$\dot{m}$}_{g_2}$ are given by the formulae in section 5.3.

Until the end of the flow path is reached the flow is considered adiabatic. At the feedwater inlet we assume that thermal equilibrium is reached instantaneously, ie the equilibrium enthalpy at the outlet of flow path $\framebox{4}$ , h_i [J/kg], can be expressed as

$\begin{displaymath} h_i = \frac{\mbox{$\dot{m}$}_d h_d + \mbox{$\dot{m}$}_{\ell... ...{m}$}_d + \mbox{$\dot{m}$}_{\ell_2} + \mbox{$\dot{m}$}_{g_2}} \end{displaymath}$

(5.19)

where h_d [J/kg] is the specific enthalpy of the feedwater and the feedwater mass flow rate, $\mbox{$\dot{m}$}_d$ [kg/s], in steady-state can be stated as

$\begin{displaymath} \mbox{$\dot{m}$}_d = \mbox{$\dot{m}$}_{\ell_1} + \mbox{$\dot{m}$}_{g_1} \end{displaymath}$

(5.20)

where the mass flow rates $\mbox{$\dot{m}$}_{\ell_1}$ and $\mbox{$\dot{m}$}_{g_1}$ belong to the vapor outlet of the steam separator (see section 5.3).

Next: Downcomer flow path, Up: Primary coolant circulation loop Previous: Steam separator assembly, Contents Index

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