Two of the four possible geometries G.1 to G.4 of a heat exchanger with three tube-side passes and two segmental baffles (three shell-side passes) have flow configurations, which enable a quick calculation of the heat exchanger effectiveness by the procedure described in Section 112. These are the geometries G.1 and G.4 with the lowest and the highest heat exchanger effectiveness respectively. The steps of the computations are demonstrated with an example for the case, when the ratio of the heat capacity rates R = 1 and the cell effectiveness E_c = 0.3.

A. Heat exchangers with geometry G.1

The steps of calculations are clear from Figure 1.

Figure 1 Steps for evaluating the effectiveness of the heat exchanger with the Geometry G.1

\[E_{p,2 \to 3} = 0.3 + 0.3 - 2\times 0.3\times 0.3 = 0.420\] (parallel flow)