Heat exchanger arrangement

In the heat exchanger arrangement illustrated in Fig. 7.32 the following are known ... 

Kays and London [3] have presented effectiveness ratios for various heat-exchanger arrangements, and some of the results of their analyses are available in chart form in Figs. 10-12 to 10-17. Examples 10-9 to 10-14 illustrate the use of the effectiveness-NTU method in heat-exchanger analysis. 

Figure 8, The SBCR with preferred heat exchanger arrangement and catalyst particle size, and system properties for simulations.

Innovation has been exercised by residual heat removal walls of the contaimnent. Steam from the reactor is condensed directly on the walls of the containment or by means of a heat exchanger arrangement. The latter system allows for a full double containment as required in some countries. For practical reason, direct heat transfer through the contaimnent puts a limit on the reactor power level that could be attained with such arrangemem. This limits such possibility to the SMR range. 

Perhaps most ingenuity has been exercised in the provision of heat removal systems from the containment. Heat can be removed either through the walls of the containment itself or by means of a heat exchanger arrangement. An example would have condensing surfaces within the containment, to condense steam released from the reactor pressure vessel, and cooled by water circulating by natural convection to an air cooler. The latter system allows the use of a full double containment as is required in some countries. 

The compressed water vapor condensate is the product of this process. Its sensible heat, as well as that of the brine concentrate, are used to heat the feed brine in a heat-exchanger arrangement (Figure 10.2.3). 

Figure 13.1 Multistage reactor/heat exchanger arrangement.

Figure B.l shows a pair of composite curves divided into vertical enthalpy intervals. Also shown in Fig. B.l is a heat exchanger network for one of the enthalpy intervals which will satisfy all the heating and cooling requirements. The network shown in Fig. B.l for the enthalpy interval is in grid diagram form. The network arrangement in Fig. B.l has been placed such that each match experiences the ATlm of the interval. The network also uses the minimum number of matches (S - 1). Such a network can be developed for any interval, providing each match within the interval (1) satisfies completely the enthalpy change of a strearh in the interval and (2) achieves the same ratio of CP values as exists between the composite curves (by stream splitting if necessary).

For heat exchangers other than the parallel and counterflow types, the basic heat-transfer equations, and particularly the effective fluid-to-fluid temperature differences, become very complex (5). For simplicity, however, the basic heat-transfer equation for general flow arrangement may be written as... 

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