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k) l) m) Figure 9.3 Assembling sequence of the new PCHE design [from Dewson and Grady, 2003] Figure 9.3 shows how the plates are stacked and the whole heat exchanger assembled. Part a) of that figure displays the stacked plates after they were diffusion bonded. The maximum height of this stack is currently 1500 mm, but can be increased if a large order is placed, as noted above. Two stacks form the core of the heat exchanger module, part b). The plates are designed such that they keep one medium between the two stacks and the other on the outside. To separate the hot and cold end of the medium that is placed on the inside of the stacks there are two separating sheets placed between the stacks, part c). Since they separate inlet and outlet of the same medium they have to withstand only the pressure differential caused by the heat exchanger pressure drop. Part d) shows the outer headers that separate the cold end of one medium from the hot end of the other medium. These headers are the pressure boundary between the fluids. This arrangement also minimizes the temperature difference at the partition. Parts e) and f) show the connection of the inlet and outlet piping for one of the fluids. The whole module is shown in part g). Part h) displays the detail of the bottom header. Part j) explains the flow path for the high pressure medium, which is placed on the inside in order to minimize the stresses that the module pressure vessel has to withstand. Part k) explains the flow path of the low pressure fluid, which does not include any headers, since the intake and outake are from and into separate volumes of the module pressure vessel. The arrangement of the 6 modules inside the pressure vessel is shown in part l) and m). This design was developed for the helium Brayton cycle [Dewson and Thonon, 2003]. A similar layout would be well suited for the supercritical CO2 cycle as well. The 208PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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