The effectiveness of a shell-and-tube heat exchanger with segmental baffles depends on the relative position of the inlet and outlet nozzles for both fluids, among other parameters. As demonstrated in Section 110, some flow configurations lead to the same higher and others to the same lower heat exchanger effectiveness. The inlet nozzle of stream 2 may be located relative to the inlet nozzle of stream 1 at four different positions. The four possible geometries (G) are shown in Figure 1 and hereafter are called G.1, G.2, G.3 and G.4. The relative position of the outlet nozzles for each geometry depends on the number of passes for each stream, whether this number is even or odd. In general:

\[\label{eq1} E = f(E_{c,1}, E_{c,2},\dots,E_{c,N_c } ,R,G,M,N) \tag{1}\]

For the case where the cell effectiveness E_c is constant

\[\label{eq2} E = f(E_c ,R,G,M,N) \tag{2}\]

Here M and N are the number of passes for stream 1 and stream 2, respectively.